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US20030025580A1 - Apparatus utilizing latching micromagnetic switches - Google Patents

Apparatus utilizing latching micromagnetic switches Download PDF

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Publication number
US20030025580A1
US20030025580A1 US10/147,918 US14791802A US2003025580A1 US 20030025580 A1 US20030025580 A1 US 20030025580A1 US 14791802 A US14791802 A US 14791802A US 2003025580 A1 US2003025580 A1 US 2003025580A1
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United States
Prior art keywords
switch
switches
latching
latching micromagnetic
electrical device
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Abandoned
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US10/147,918
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English (en)
Inventor
Charles Wheeler
Jun Shen
Meichun Ruan
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Magfusion Inc
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Microlab Inc
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Priority to US10/147,918 priority Critical patent/US20030025580A1/en
Assigned to MICROLAB, INC. reassignment MICROLAB, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RUAN, MEICHUN, SHEN, JUN, WHEELER, CHARLES
Assigned to LEMBERG, DANIEL, TOPOREK, MICHAEL reassignment LEMBERG, DANIEL SECURITY AGREEMENT Assignors: MICROLAB, INCORPORATED
Publication of US20030025580A1 publication Critical patent/US20030025580A1/en
Assigned to MAGFUSION, INC. reassignment MAGFUSION, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MICROLAB, INCORPORATED
Priority to US11/012,078 priority patent/US20050285703A1/en
Assigned to MAGFUSION, INC. [FORMERLY MICROLAB, INCORPORATED] reassignment MAGFUSION, INC. [FORMERLY MICROLAB, INCORPORATED] SECURITY INTEREST RELEASE Assignors: LEMBERG, DANIEL, TOPOREK, MICHAEL
Priority to US11/483,192 priority patent/US7372349B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/005—Details of electromagnetic relays using micromechanics
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/005—Details of electromagnetic relays using micromechanics
    • H01H2050/007—Relays of the polarised type, e.g. the MEMS relay beam having a preferential magnetisation direction

Definitions

  • the present invention relates to an electrical apparatus having an electronic device with its energy flow controlled by switches.
  • Switches are typically electrically controlled two-state devices that open and close contacts to effect operation of devices in an electrical or optical circuit.
  • Relays typically function as switches that activate or deactivate portions of electrical, optical or other devices. Relays are commonly used in many applications including telecommunications, radio frequency (RF) communications, portable electronics, consumer and industrial electronics, aerospace, and other systems.
  • RF radio frequency
  • optical switches also referred to as “optical relays” or simply “relays” herein
  • optical switches have been used to switch optical signals (such as those in optical communication systems) from one path to another.
  • micromagnetic relays typically include an electromagnet that energizes an armature to make or break an electrical contact. When the magnet is de-energized, a spring or other mechanical force typically restores the armature to a quiescent position.
  • Such relays typically exhibit a number of marked disadvantages, however, in that they generally exhibit only a single stable output (i.e., the quiescent state) and they are not latching (i.e., they do not retain a constant output as power is removed from the relay).
  • the spring required by conventional micromagnetic relays may degrade or break over time.
  • Non-latching micromagnetic relay switches are known. Such relays include a permanent magnet and an electromagnet for generating a magnetic field that intermittently opposes the field generated by the permanent magnet. The replay must consume power in the electromagnet to maintain at least one of the output states. Moreover, the power required to generate the opposing field would be significant, thus making the relay less desirable for use in space, portable electronics, and other applications that demand low power consumption.
  • the basic elements of a micromagnetic latching switch include a permanent magnet, a substrate, a coil, and a cantilever at least partially made of soft magnetic materials.
  • the permanent magnet produces a static magnetic field that is relatively perpendicular to the horizontal plane of the cantilever.
  • the magnetic field lines produced by a permanent magnet with a typical regular shape are not necessarily perpendicular to a plane, especially at the edge of the magnet. Then, any horizontal component of the magnetic field due to the permanent magnet can either eliminate one of the bistable states or greatly increase the current that is needed to switch the cantilever from one state to the other.
  • a bi-stable, latching switch that has a very low series resistance value and that does not require power to hold the state is therefore desired.
  • Such a switch should also be reliable, simple in design, low-cost and easy to manufacture, and should be useful in optical and/or electrical environments.
  • the electrical device and the latching micromagnetic switch are integrated on a same substrate.
  • the electrical device and the latching micromagnetic switch are located on separate substrates and coupled together.
  • the switch includes a dual-layer cantilever, an embedded coil, and a permanent magnet.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus for illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • FIG. 1 A block diagram illustrating an electrical apparatus.
  • the plurality of switches couple adjacent ones of the multiple conductive traces to control energy flow through the antenna to tune the antenna.
  • An advantage of embodiments of the present invention is that they provide a bi-stable, latching switch that has a very low impedance value and that does not require power to hold the states.
  • FIGS. 1A and 1B are side and top views, respectively, of an exemplary embodiment of a switch.
  • FIG. 2 illustrates the principle by which bi-stability is produced.
  • FIG. 3. illustrates the boundary conditions on the magnetic field (H) at a boundary between two materials with different permeability (m 1 >>m 2 ).
  • FIG. 4 shows the computer simulation of magnetic flux distributions, according to the present invention.
  • FIGS. 5 A-C show extracted horizontal components (Bx) of the magnetic flux in FIG. 4.
  • FIGS. 6A and 6B show a top view and a side view, respectively, of a micromagnetic latching switch 600 with relaxed permanent magnet alignment according to an aspect of the present invention.
  • FIGS. 9A and 9B show a top view and a side view, respectively, of a micromagnetic latching switch with additional features of the present invention.
  • FIG. 10 illustrates an apparatus including a device and a latching micromagnetic switch according to embodiments of the present invention.
  • FIGS. 11 - 12 illustrate a portion of an apparatus including a filter and two latching micromagnetic switches according to embodiments of the present invention.
  • FIG. 16 illustrates a portion of an apparatus including an antenna with multiple conductive traces and multiple latching micromagnetic switches according to embodiments of the present invention.
  • FIG. 17 illustrates a portion of an apparatus including a transceiver and antenna coupled via two latching micromagnetic switches according to embodiments of the present invention.
  • FIG. 18 illustrates a portion of system using a micromagnetic switch to control power supply to electronic devices and/or circuits.
  • metal line interconnect line, trace, wire, conductor, signal path and signaling medium are all related.
  • the related terms listed above, are generally interchangeable, and appear in order from specific to general.
  • metal lines are sometimes referred to as traces, wires, lines, interconnect or simply metal.
  • Metal lines generally gold (Au), aluminum (Al), copper (Cu) or an alloy of Al and Cu, are conductors that provide signal paths for coupling or interconnecting, electrical circuitry. Conductors other than metal are available in microelectronic devices.
  • doped polysilicon doped single-crystal silicon (often referred to simply as diffusion, regardless of whether such doping is achieved by thermal diffusion or ion implantation), titanium (Ti), molybdenum (Mo), and refractory metal suicides are examples of other conductors.
  • contact and via both refer to structures for electrical connection of conductors from different interconnect levels. These terms are sometimes used in the art to describe both an opening in an insulator in which the structure will be completed, and the completed structure itself. For purposes of this disclosure contact and via refer to the completed structure.
  • vertical means substantially orthogonal to the surface of a substrate.
  • spatial descriptions e.g., “above”, “below”, “up”, “down”, “top”, “bottom”, etc.
  • latching relays can be spatially arranged in any orientation or manner.
  • micromagnetic latching switch is further described in international patent publications WO0157899 (titled Electronically Switching Latching Micromagnetic Relay And Method of Operating Same), and WO0184211 (titled Electronically Micromagnetic latching switches and Method of Operating Same), to Shen et al.
  • WO0157899 entitled Electronically Switching Latching Micromagnetic Relay And Method of Operating Same
  • WO0184211 titled Electronically Micromagnetic latching switches and Method of Operating Same
  • FIGS. 1A and 1B show side and top views, respectively, of a latching switch.
  • the terms switch and device are used herein interchangeably to described the structure of the present invention.
  • an exemplary latching relay 100 suitably includes a magnet 102 , a substrate 104 , an insulating layer 106 housing a conductor 114 , a contact 108 and a cantilever (moveable element) 112 positioned or supported above substrate 104 by a staging layer 110 .
  • Magnet 102 is any type of magnet such as a permanent magnet, an electromagnet, or any other type of magnet capable of generating a magnetic field H 0 134 , as described more fully below.
  • the magnet 102 can be a model 59-P09213T001 magnet available from the Dexter Magnetic Technologies corporation of Fremont, Calif., although of course other types of magnets could be used.
  • Magnetic field 134 can be generated in any manner and with any magnitude, such as from about 1 Oersted to 10 4 Oersted or more. The strength of the field depends on the force required to hold the cantilever in a given state, and thus is implementation dependent. In the exemplary embodiment shown in FIG.
  • magnetic field H 0 134 can be generated approximately parallel to the Z axis and with a magnitude on the order of about 370 Oersted, although other embodiments will use varying orientations and magnitudes for magnetic field 134 .
  • a single magnet 102 can be used in conjunction with a number of relays 100 sharing a common substrate 104 .
  • Substrate 104 is formed of any type of substrate material such as silicon, gallium arsenide, glass, plastic, metal or any other substrate material.
  • substrate 104 can be coated with an insulating material (such as an oxide) and planarized or otherwise made flat.
  • a number of latching relays 100 can share a single substrate 104 .
  • other devices such as transistors, diodes, or other electronic devices
  • magnet 102 could be used as a substrate and the additional components discussed below could be formed directly on magnet 102 . In such embodiments, a separate substrate 104 may not be required.
  • Insulating layer 106 is formed of any material such as oxide or another insulator such as a thin-film insulator. In an exemplary embodiment, insulating layer is formed of Probimide 7510 material. Insulating layer 106 suitably houses conductor 114 . Conductor 114 is shown in FIGS. 1A and 1B to be a single conductor having two ends 126 and 128 arranged in a coil pattern. Alternate embodiments of conductor 114 use single or multiple conducting segments arranged in any suitable pattern such as a meander pattern, a serpentine pattern, a random pattern, or any other pattern. Conductor 114 is formed of any material capable of conducting electricity such as gold, silver, copper, aluminum, metal or the like. As conductor 114 conducts electricity, a magnetic field is generated around conductor 114 as discussed more fully below.
  • Cantilever (moveable element) 112 is any armature, extension, outcropping or member that is capable of being affected by magnetic force.
  • cantilever 112 suitably includes a magnetic layer 118 and a conducting layer 120 .
  • Magnetic layer 118 can be formulated of permalloy (such as NiFe alloy) or any other magnetically sensitive material.
  • Conducting layer 120 can be formulated of gold, silver, copper, aluminum, metal or any other conducting material.
  • cantilever 112 exhibits two states corresponding to whether relay 100 is “open” or “closed”, as described more fully below.
  • relay 100 is said to be “closed” when a conducting layer 120 , connects staging layer 110 to contact 108 . Conversely, the relay may be said to be “open” when cantilever 112 is not in electrical contact with contact 108 . Because cantilever 112 can physically move in and out of contact with contact 108 , various embodiments of cantilever 112 will be made flexible so that cantilever 112 can bend as appropriate. Flexibility can be created by varying the thickness of the cantilever (or its various component layers), by patterning or otherwise making holes or cuts in the cantilever, or by using increasingly flexible materials.
  • cantilever 112 can be made into a “hinged” arrangement (such as that described below in conjunction with FIG. 12).
  • an exemplary cantilever 112 suitable for use in a micromagnetic relay 100 can be on the order of 10-1000 microns in length, 1-40 microns in thickness, and 2-600 microns in width.
  • an exemplary cantilever in accordance with the embodiment shown in FIG. 1 can have dimensions of about 600 microns ⁇ 10 microns ⁇ 50 microns, or 1000 microns ⁇ 600 microns ⁇ 25 microns, or any other suitable dimensions.
  • contact 108 and staging layer 110 are placed on insulating layer 106 , as appropriate.
  • staging layer 110 supports cantilever 112 above insulating layer 106 , creating a gap 116 that can be vacuum or can become filled with air or another gas or liquid such as oil.
  • gap 116 can be on the order of 1-100 microns, such as about 20 microns
  • Contact 108 can receive cantilever 112 when relay 100 is in a closed state, as described below
  • Contact 108 and staging layer 110 can be formed of any conducting material such as gold, gold alloy, silver, copper, aluminum, metal or the like.
  • contact 108 and staging layer 110 are formed of similar conducting materials, and the relay is considered to be “closed” when cantilever 112 completes a circuit between staging layer 110 and contact 108 .
  • staging layer 110 can be formulated of non-conducting material such as Probimide material, oxide, or any other material. Additionally, alternate embodiments may not require staging layer 110 if cantilever 112 is otherwise supported above insulating layer 106 .
  • the cantilever When it is in the “down” position, the cantilever makes electrical contact with the bottom conductor, and the switch is “on” (also called the “closed” state). When the contact end is “up”, the switch is “off” (also called the “open” state). These two stable states produce the switching function by the moveable cantilever element.
  • the permanent magnet holds the cantilever in either the “up” or the “down” position after switching, making the device a latching relay.
  • a current is passed through the coil (e.g., the coil is energized) only during a brief (temporary) period of time to transition between the two states.
  • the torque is clockwise.
  • the bidirectional torque arises because of the bidirectional magnetization (i.e., a magnetization vector “m” points one direction or the other direction, as shown in FIG. 2) of the cantilever (m points from left to right when ⁇ 90°, and from right to left when ⁇ >90°). Due to the torque, the cantilever tends to align with the external magnetic field (H 0 ). However, when a mechanical force (such as the elastic torque of the cantilever, a physical stopper, etc.) preempts to the total realignment with H 0 , two stable positions (“up” and “down”) are available, which forms the basis of latching in the switch.
  • a mechanical force such as the elastic torque of the cantilever, a physical stopper, etc.
  • a permalloy cantilever in a uniform (in practice, the field can be just approximately uniform) magnetic field can have a clockwise or a counterclockwise torque depending on the angle between its long axis (easy axis, L) and the field.
  • Two bistable states are possible when other forces can balance die torque.
  • a coil can generate a momentary magnetic field to switch the orientation of magnetization (vector m) along the cantilever and thus switch the cantilever between the two states.
  • the inventors have developed a technique to create perpendicular magnetic fields in a relatively large region around the cantilever.
  • the invention is based on the fact that the magnetic field lines in a low permeability media (e.g., air) are basically perpendicular to the surface of a very high permeability material (e.g., materials that are easily magnetized, such as permalloy).
  • a low permeability media e.g., air
  • a very high permeability material e.g., materials that are easily magnetized, such as permalloy
  • FIG. 4A and 4B shows the computer simulation of magnetic flux (B) distributions.
  • the flux lines are less perpendicular to the horizontal plane, resulting in a large horizontal (x) component.
  • the magnetic flux lines are approximately perpendicular to the horizontal plane in a relatively large region when a high-permeability magnetic layer is introduced with its surface parallel to horizontal plane (b).
  • the region indicated by the box with dashed lines will be the preferred location of the switch with the cantilever horizontal plane parallel to the horizontal axis (x).
  • FIGS. 6A and 6B show a top view and a side view, respectively, of a micromagnetic latching switch 600 with relaxed permanent magnet alignment according to an aspect the present invention.
  • the switch comprises the following basic elements: first high-permeability magnetic layer 602 , substrate 604 , second high-permeability magnetic layer 606 , dielectric layers 608 and 610 , a spiral coil 612 , bottom conductor 614 , cantilever assembly 616 (with at least a soft magnetic layer 618 and other conducting and/or supporting torsion spring 620 ), and a top permanent magnetic layer 622 with a vertical magnetization orientation.
  • the switch system comprises micromagnetic cantilevers, electromagnets (S-shape or single-line coils), permanent magnetic and soft magnetic layer in parallel to provide an approximate uniform magnetic field distribution, single-pole double-throw (SPDT) schemes, and transmission line structures suitable for radio frequency signal transmissions.
  • micromagnetic cantilevers electromagnets (S-shape or single-line coils)
  • permanent magnetic and soft magnetic layer in parallel to provide an approximate uniform magnetic field distribution
  • SPDT single-pole double-throw
  • transmission line structures suitable for radio frequency signal transmissions.
  • FIGS. 9A and 9B shows a top view and a side view, respectively, of a micromagnetic latching switch with additional features of the present invention.
  • the switch 900 comprises the following basic elements: a cantilever made of soft magnetic material (e.g., permalloy) and a conducting layer, cantilever-supporting hinges (torsion spring), bottom contacts that serve as the signal lines, an “S-shape” planar conducting coil, a permalloy layer (or other soft magnetic material) on the substrate (which is permalloy silicon, GaAs, glass, etc.), and a bottom permanent magnet (e.g., Neodymium) attached to the bottom of the substrate.
  • the magnet can be placed or fabricated directly on the substrate.
  • the permanent magnetic field holds (latches) the cantilever to either state.
  • the cantilever's bottom conductor e.g., Au
  • the signal line 2 is disconnected.
  • the cantilever toggles to the left the signal line 2 is connected and signal line 1 is disconnected. It forms a SPDT latching switch.
  • the widths of the magnet and permalloy layer on substrate are same, in reality, they can be different. The width of the magnet can either be larger or smaller than the width of the pertnalloy layer.
  • latching micromagnetic switches 100 of the present invention can be used to change various characteristics of such conductive traces, or simply connect or couple them together.
  • the latching micromagnetic switches 100 of the present invention can be used to adjust, select, switch, couple, or otherwise reconfigurable (e.g., digitally tune) many types of devices or conductive traces.
  • conductive trace means any metal, metal alloy, semiconductor (e.g., doped or not doped) or other conductive material formed or otherwise patterned on a substrate, as would also become apparent to a person skilled in the art based on the teachings herein.
  • semiconductor e.g., doped or not doped
  • conductive trace is used interchangeably herein.
  • the apparatus 1000 also includes an electrical device 1004 (e.g., a circuit(s), a filter(s), a filter system, an antenna(s), a transceiver(s), etc.) coupled to one or more switches 100 .
  • switch 1002 can be coupled adjacent an input, an output, or both.
  • switch 1002 can be in electrical device 1004 and not at an input and an output, or can be in electrical device 1004 , adjacent an input, adjacent an output, or any combination thereof.
  • a device can be retrofitted to be coupled to and controlled by switches 1002 , while in other embodiments the electric device 1004 and switches 1002 can be integrated on the same substrate. Switches 1002 control energy flow through electrical device 1004 , while providing the benefits of using MEMs technology as described above.
  • GSM Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • European GSM Global System for Mobile Communications
  • GPS Global System for Mobile Communications
  • GSM Global System for Mobile Communications
  • the electronic components that makeup a two-way radio, such as filters, oscillators, power amplifiers and antennas must typically be designed to operate over a very narrow and specific frequency range in order to achieve the required level of performance.
  • filters, oscillators, power amplifiers and antennas must typically be designed to operate over a very narrow and specific frequency range in order to achieve the required level of performance.
  • several similar components must be used, each of which is allocated to a different mode. This approach is costly, bulky and complicated.
  • switches can eliminate much of this redundancy by providing a way of producing sufficiently high quality reconfigurable RF components that cannot be practically implemented using other more conventional design approaches.
  • Switches are uniquely suited for this purpose because they have a very high bandwidth, high linearity, low insertion loss, high isolation, require a small chip area and can be produced cost effectively.
  • a bandpass filter was chosen as an example because they are used extensively in cell phones and wireless local area networks (LANs), but it should be noted that the following concepts can equally well be applied to various order lowpass, high-pass and band rejection filters, and the like.
  • FIG. 11 illustrates a portion of an apparatus 1100 according to embodiments of the present invention.
  • Apparatus 1100 includes a switch (S) 1102 at an input, a filter (F) 1104 , and switch 1106 at an output. No energy flows through this apparatus 1 100 unless both switches 1102 and 1106 are open, thus turning the filter 1100 ON and OFF.
  • FIG. 13A illustrates a portion of an apparatus 1300 according to embodiments of the present invention.
  • Apparatus 1300 includes a plurality of filters 1302 that are controlled by a pair of switches 1304 and 1306 .
  • filters 1302 can be an actual filter circuit or branches of a large filter (not shown).
  • This apparatus 1300 can be a telephone, as described above, that has multiple frequency bands, and thus multiple band pass band filters 1302 .
  • Switches 1304 and 1306 control which filter 1302 is operating, thus controlling which frequency is being used by the apparatus 1300 .
  • FIG. 13B illustrates a circuit diagram of a portion of an apparatus 1350 according to embodiments of the present invention.
  • Apparatus 1350 includes four filters 1352 - 1358 coupled between two switches 1360 and 1362 .
  • the four filters 1352 - 1358 can be either lumped types filters (FIG. 14) or any other type of filters, such as SAW filters, BAW filters, etc.
  • the switches 1360 and 1362 can be either single-pole, four-throw switches (SP4T) or equivalently a 1 ⁇ 4 matrix switch configured from one or more latching micromagnetic switches in accordance with embodiments of the present invention.
  • SP4T single-pole, four-throw switches
  • the switches 1360 and 1362 can include four latching micromagnetic switches controlled by a single signal to turn only one latching micromagnetic switch OFF and ON at a time, such that only one filter 1352 - 1358 is operating at a time. It is to be appreciated that any “m” (m is any positive integer) filters can be controlled by switches 1360 and 1362 , thus the switches maybe single-pole, “m”-throw switches or 1 ⁇ m matrix switches.
  • FIG. 14 is a circuit diagram illustrating a portion of an apparatus 1400 according to embodiments of the present invention.
  • Apparatus 1400 includes a reconfigurable bandpass filter design that uses magnetic latching MEMS switches 1402 - 1416 to select any combination of four different frequency passbands according to embodiments of the present invention.
  • a large filter comprises four different small filters or “branches” 1418 - 1424 , each of which is an independent bandpass filter “tuned” to a different and specific frequency.
  • branches 1418 - 1424
  • a third order equal-ripple filer design is shown.
  • the individual lumped element values for the capacitors and inductors are given in the figure as exemplary values.
  • Switches 1402 and 1404 are either both open or both closed.
  • 1406 and 1408 are either both open or both closed, and likewise for pairs 1410 and 1412 and pairs 1416 and 1418 .
  • four separate filters 1418 - 1424 are replaced by a single switchable larger filter, which can considerably reduce the overall number of components in a multi-band cell phone (not shown). In other embodiments, any number of branches or filter elements can be accommodated.
  • FIG. 15 illustrates a portion of an apparatus 1500 according to embodiments of the present invention.
  • Apparatus 1500 is based on a distributed microstrip design, rather than the lumped (discrete) approach described in FIG. 14.
  • the distributed microstrip reconfigurable large filter consists of three sub-filter “branches” or filters 1502 - 1506 that are selected using latching magnetic MEMS switches 1508 - 1518 .
  • the microstrip architecture relies on appropriately designed sections of transmission lines to produce the required inductance and capacitance values needed to synthesize the large filter.
  • three implementations of distributed bandpass filters are shown according to embodiments of the present invention.
  • a coupled line architecture 1506 a coupled line architecture 1506 , a stub filter 1504 , and a capacitive-gap coupled line bandpass filter 1502 .
  • These distributed approaches have the advantages of compactness and simplicity of fabrication, and good performance at high frequencies, but lack the high-Q performance of the discrete design.
  • reconfigurablity of RF components using latching magnetic MEMS components can be further extended to envision structures such as reconfigurable inductors, where a “chain” of inductors is connected in series using MEMS switches. The series connection of several small inductors would yield the sum total inductance of all the small inductors additively. A “tunable” inductor could thus be constructed. Similarly, a parallel “chain” of capacitors could be produced in the identical way.
  • FIG. 17 illustrates a portion of an apparatus 1700 according to embodiments of the present invention.
  • Apparatus 1700 can be a transceiver in which latching micromagnetic switches 1702 and 1704 can be used to switch coupling of an antenna or antenna array (not shown) between a transmit circuit (not shown) and a receive circuit (not shown). This is accomplished by having two latching micromagnetic switches 1702 and 1704 coupling a receiver (not shown) or a transmitter (not shown) to an antenna (not shown).
  • FIG. 18 illustrates a schematic drawing of an apparatus 1800 according to embodiments of the present invention.
  • Apparatus 1800 includes a latching micromagnetic switch 1802 having a cantilever 1804 , a permanent magnet 1806 , and a coil 1808 .
  • the coil is controlled by a controller 1810 to move the cantilever between two stable positions.
  • the switch 1802 is coupled between a power supply 1812 and an electrical devices and/or circuits (electronic device) 1814 .
  • the switch 1802 is used to control the flow of power from the power supply 1812 to the electronic devices and/or circuits 1814 .
  • a short current pulse through the coil 1808 in the switch 1802 turns the switch 1802 ON. In the ON state the power supply 1812 is connected to the electronic device 1814 .
  • a short, opposite current pulse through the coil 1808 turns the switch 1802 OFF and disconnects the power supply 1812 from the electronic device 1814 .
  • Latching micromagnetic switches of the present invention can be used with conductive traces in many other applications as well. They can be employed as switching elements for digital components, such as multiplexers and de-multiplexers, phase shifters, delay lines, surface acoustic wave (SAW) devices, programable RF circuits, and tunable oscillators.
  • digital components such as multiplexers and de-multiplexers, phase shifters, delay lines, surface acoustic wave (SAW) devices, programable RF circuits, and tunable oscillators.
  • the latching micromagnetic switches can be used to redirect signals according to a desired mux or demux. logic function.
  • phase shifters, delay lines, surface acoustic wave (SAW) devices the latching micromagnetic switches can switch in or switch out additional elements of delay or phase, and in the case of a SAW add or subtract inter digitate finger elements as desired.
  • programable RF circuits such as a tunable oscillator
  • conductive traces are used in integrated circuit couplers.
  • the wavelength, impedance, or the like, of such couplers can be adjusted using latching micromagnetic switches.
  • the latching micromagnetic switches can either be integrated on a same substrate as an electrical device being controlled or can be non-integrated and located on a separate substrate from the electrical device being controlled. This allows for pre-existing devices to use the switches, while also allowing for new devices to integrate the switches to reduce the size of the overall apparatus.
  • Latching micromagnetic switches of the present invention can be used in high redundancy RF circuit applications to switch-in redundant components to replace failed components.
  • Another area in which the latching micromagnetic switches of the present invention can be used is in RF switch arrays for a testing apparatus. Once a probe is connected to a device under test, various tests can be performed by switchably connecting various different test modules/circuits using an array of micromagnetic latches according to the present invention.
  • the latching micromagnetic switches of the present invention can be used in communications switch applications, such as in cross-point switches.
  • Public switch network switches and private branch exchange switches can be implemented using cross-point switches comprising latching micromagnetic switches.
  • Both optical-to-electrical-to-optical (OEO) and all optical cross-point switch can employ latching micromagnetic switches.
  • Repeaters exist for receiving EM (electromagnetic) information signals, optionally performing signal conditioning or processing (amplification, filtering, frequency translation, etc.) on the received signals, and re-transmitting the conditioned signals at same or different frequencies. Repeaters suffer from the disadvantage of being relatively expensive in terms of cost and power consumption.
  • Conventional wireless communications circuitry is complex and has a large number of circuit parts. Higher part counts result in higher power consumption, which is undesirable, particularly in battery powered repeater units.
  • a latching micromagnetic switch according to the present invention can reduce power consumption in such repeaters.
  • High sensitivity, low noise amplifiers can also benefit by incorporating latching micromagnetic switches.
  • a selectable number of output devices e.g., transistors
  • Gate and/or drain switching can be performed by latching micromagnetic switches to achieve a highQ, low noise signal.
  • Latching micromagnetic switches can also be used as switching elements in each pixel of an image projector.
  • a dense array of mirrored cantilevered switches can be used to project bright light or filtered light of much higher intensity than permitted by conventional LCD projectors.
  • the latching micromagnetic switches of the present invention can withstand switching speeds well in excess of the frequency required for image projection.
  • the low-power dissipation of the latching micromagnetic switches of the present invention can have benefits in power management and replay circuits in many fields.
  • An example field is automotive applications, such as sensor switching and higher power switching using parallel latching micromagnetic switches.
  • Latching micromagnetic switches can be used in conjunction with a magnetic key to implement a reconfigurable relay lock.
  • a key can be fabricated by arranging several to hundreds of miniature magnets in a physically, programmed array fashion.
  • a cooperative lock mechanism to receive the key can be formed of an array of latching micromagnetic switches to read the programmed array of miniature magnets to unlock any manner of device, circuit or hardware component (e.g., a door).
  • the key can be configured as a flat rectangular card, or can take-on a variety of physical shapes, as would also become apparent to a person skilled in the art.
  • the lock can be digitally controlled to facilitate a programmable code.
  • Another security approach is to simply group switches together in a combinational logic circuit that would require actuation of the given combination of switches to pass a signal.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Micromachines (AREA)
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US10/147,918 2001-05-18 2002-05-20 Apparatus utilizing latching micromagnetic switches Abandoned US20030025580A1 (en)

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US11/012,078 US20050285703A1 (en) 2001-05-18 2004-12-15 Apparatus utilizing latching micromagnetic switches
US11/483,192 US7372349B2 (en) 2001-05-18 2006-07-10 Apparatus utilizing latching micromagnetic switches

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US10/147,918 US20030025580A1 (en) 2001-05-18 2002-05-20 Apparatus utilizing latching micromagnetic switches

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US10/147,915 Expired - Fee Related US6894592B2 (en) 2001-05-18 2002-05-20 Micromagnetic latching switch packaging
US11/012,078 Abandoned US20050285703A1 (en) 2001-05-18 2004-12-15 Apparatus utilizing latching micromagnetic switches
US11/483,192 Expired - Fee Related US7372349B2 (en) 2001-05-18 2006-07-10 Apparatus utilizing latching micromagnetic switches

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US11/012,078 Abandoned US20050285703A1 (en) 2001-05-18 2004-12-15 Apparatus utilizing latching micromagnetic switches
US11/483,192 Expired - Fee Related US7372349B2 (en) 2001-05-18 2006-07-10 Apparatus utilizing latching micromagnetic switches

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EP1399939A1 (fr) 2004-03-24
WO2002095784A1 (fr) 2002-11-28
WO2002095896A2 (fr) 2002-11-28
EP1399939A4 (fr) 2006-11-15
AU2002318143A1 (en) 2002-12-03
WO2002095896A9 (fr) 2004-02-12
US7372349B2 (en) 2008-05-13
US6894592B2 (en) 2005-05-17
WO2002095896A3 (fr) 2003-04-24
US20050285703A1 (en) 2005-12-29
US20030011450A1 (en) 2003-01-16
US20070018762A1 (en) 2007-01-25

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