CN115579603A - A terahertz broadband combiner based on gap waveguide - Google Patents

Abstract

The invention belongs to the technical field of microelectronic mechanical manufacturing, and particularly relates to a terahertz broadband combiner based on gap waveguide, which comprises: the terahertz wave combining device comprises a first standard waveguide port for inputting a terahertz low-frequency signal, a second standard waveguide port for inputting a terahertz high-frequency signal, a third combining port for outputting a terahertz combining signal, three matching transition structures, two input ridge waveguide gradual change transition structures, a low-pass filtering structure, a combining gap waveguide structure and a combining ridge waveguide gradual change transition structure. The terahertz broadband combiner based on the gap waveguide has the advantages of wide working frequency band, low loss and easiness in processing, and can effectively meet the requirement of combining a terahertz system.

Description

A terahertz broadband combiner based on gap waveguide

technical field

The invention belongs to the technical field of microelectronic machinery manufacturing, and in particular relates to a terahertz broadband combiner based on a gap waveguide.

Background technique

The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

Terahertz frequency doubling technology is an important technical way to realize terahertz sources, and it is also a research hotspot in the international terahertz sources. However, at this stage, the output signal frequency range of terahertz frequency doubling source devices is limited to a single waveguide frequency band, and the working bandwidth is limited. , it is difficult to meet the growing broadband demand of the terahertz system. In order to solve the above problems, frequency multipliers in adjacent frequency bands are required to combine the frequency bands to achieve frequency band splicing and expand the working bandwidth. In addition, the frequency bands in the terahertz broadband system are intensively used. , there is also a combination requirement for adjacent or spaced different frequency band terahertz signal transmission. Based on the above background conditions, a terahertz broadband combiner based on gap waveguides is proposed.

Existing combiners are mainly divided into combiners with microstrip structure, combiners with dielectric structure and combiners with waveguide structure. However, combiners with microstrip structure are easy to process, small in size and wide in frequency Advantages, but as the operating frequency increases, its loss is greater and the power it withstands is smaller; the combiner with a dielectric structure has lower differential loss, good temperature characteristics, and compact structure, but it is limited by processing technology and cost ; For the combiner with the existing waveguide structure, it can withstand large power and have good performance, but the working bandwidth is limited.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a terahertz broadband combiner based on a gap waveguide.

According to some embodiments, the present invention adopts the following technical solutions:

A terahertz broadband combiner based on a gap waveguide, including: a first standard waveguide port, a second standard waveguide port, a third combining port, three transition structures based on waveguide narrow-side height gradient matching transition structures, and two input ridge waveguides Gradient transition structure, low-pass filter structure, combination gap waveguide structure and combination ridge waveguide gradient transition structure;

The first standard waveguide port is connected to the first ridge waveguide gradual change transition structure through the first matching transition structure, and then connected to the low-pass filter structure; the end of the low-pass filter structure is connected to the combiner gap waveguide structure, and the end of the combiner gap waveguide structure is connected to the combiner The ridge waveguide gradual transition structure, the end of the combining ridge waveguide gradual transition structure is connected to the third combining port for outputting the terahertz signal through the third matching transition structure;

The second standard waveguide port is connected to the second ridge waveguide gradual transition structure through the second matching transition structure, and the end of the second ridge waveguide gradual transition structure is connected to the input end of the combination gap waveguide structure.

Further, absorbers are arranged symmetrically on both sides of the first ridge waveguide gradual transition structure and the combined ridge waveguide gradual transition structure.

Further, the absorber structure is a rectangular cubic structure, which is used to suppress the generation of parasitic modes.

Further, the low-pass filter structure is a high-low impedance low-pass filter structure based on a gap waveguide.

Further, the first matching transition structure, the first ridge waveguide gradual transition structure, the low-pass filter structure, the combination gap waveguide structure, the combination ridge waveguide gradual transition structure and the third matching transition structure are coaxially arranged.

Further, the second matching transition structure and the second ridge waveguide tapered transition structure are coaxially arranged.

Further, the first matching transition structure, the second matching transition structure and the third matching transition structure are all based on the transition of the height of the narrow side of the standard rectangular waveguide.

Further, the second matching transition structure also serves as a high-pass filter, realizing the function of cutting off high-frequency signals input and low-frequency signals.

Furthermore, the transition forms of the standard rectangular waveguide port and the gap waveguide port adopt the transition form based on the narrow side height of the rectangular waveguide and the transition mode based on the gradual change of the ridge waveguide respectively.

Further, the first standard waveguide port is used for inputting terahertz low-frequency signals, the second standard waveguide port is used for inputting terahertz high-frequency signals, and the third combining port is used for outputting terahertz combining signals.

The above technical scheme has the following beneficial effects:

(1) The present invention uses the gap waveguide as the overall transmission structure of the terahertz broadband combiner. Based on the gap waveguide, a high and low impedance filter structure with low-pass characteristics is designed, and a rectangular waveguide structure is used as the high-pass filter structure. The above two parts are respectively used as Transmission structure of terahertz low frequency signal and high frequency signal. For the combined terahertz signal, the gap waveguide with broadband transmission characteristics is used as the transmission structure. The combiner provided by the present invention has the advantages of wide operating frequency band, low loss, and easy processing, and can effectively meet the needs of terahertz system combining. need.

(2) The present invention designs a filter structure based on a gap waveguide. In the embodiment, a high and low impedance filter structure is used, but it is not limited to this structure, and includes other filter structures based on a gap waveguide such as a band gap filter structure.

(3) The present invention adopts a rectangular waveguide structure as a high-pass filter structure in a terahertz combiner, so as to realize the function of cutting off high-frequency signal input and low-frequency signal.

(4) In order to facilitate the test and the connection of standard waveguide devices, the present invention realizes the transition between the gap waveguide and the standard rectangular waveguide by combining the matching transition based on the height gradient of the narrow side of the rectangular waveguide and the gradual transition based on the ridge waveguide.

(5) In order to suppress the generation of spurious modes, the present invention adds a rectangular cube absorber to avoid resonance peaks in the working frequency band.

Advantages of additional aspects of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations to the present invention.

FIG. 1 is a schematic structural diagram of a terahertz broadband combiner based on a gap waveguide in Embodiment 1.

Fig. 2 is the S parameter simulation result figure of embodiment 1.

In the figure, 1. The first matching transition structure based on the height gradient of the narrow side of the waveguide, 2. The first ridge waveguide gradual transition structure, 3. The low-pass filter structure, 4. The combination gap waveguide structure, 5. The combination ridge waveguide gradual change Transition structure, 6. The third matching transition structure based on the gradual change of waveguide narrow side height, 7. The second matching transition structure based on the gradual change of waveguide narrow side height, 8. The second ridge waveguide gradual change transition structure, 9. Absorber.

detailed description

The present disclosure will be further described below in conjunction with the accompanying drawings and embodiments.

It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

Embodiment one

The purpose of the present invention is to solve the technical problems of narrow operating frequency range, difficult processing, and large transmission loss of terahertz combiners, and provide a high-performance terahertz broadband combiner based on gap waveguides to meet the needs of terahertz system development broadband transmission needs.

As shown in Figure 1, a terahertz broadband combiner based on a gap waveguide includes: a first standard waveguide port for inputting a terahertz low-frequency signal, a second standard waveguide port for inputting a terahertz high-frequency signal, A third combining port for outputting terahertz combining signals, three transition structures based on waveguide narrow-side height gradient matching transition structures, two input ridge waveguide transition structures, low-pass filtering structure 3, combining gap waveguide structure 4, and Combined ridge waveguide gradient transition structure 5;

The first standard waveguide port is connected to the first input ridge waveguide gradual change transition structure 2 through the first matching transition structure 1, and then connected to the low-pass filter structure 3; the end of the low-pass filter structure is connected to the combination gap waveguide structure 4, and the combination gap waveguide structure The end of 4 is connected to the combining ridge waveguide gradual transition structure 5, and the end of the combining ridge waveguide gradual transition structure 5 is connected to the third combining port for outputting the terahertz signal through the third matching transition structure 6;

The second standard waveguide port is connected to the second input ridge waveguide transition structure 8 through the second matching transition structure 7, and the end of the second input ridge waveguide transition structure is connected to the input end of the combination gap waveguide structure 4;

Absorbers 9 are arranged symmetrically on both sides of the first ridge waveguide gradual transition structure and the combined ridge waveguide gradual transition structure. The absorber 9 is a rectangular cubic structure for suppressing the generation of spurious modes.

The low-pass filter structure 3 is a high-low impedance low-pass filter structure or a bandgap filter structure based on a gap waveguide.

The first matching transition structure 1, the first ridge waveguide gradual transition structure 2, the low-pass filter structure 3, the combination gap waveguide structure 4, the combination ridge waveguide gradual transition structure 5 and the third matching transition structure 6 are coaxial Setting; the second matching transition structure 7 and the second ridge waveguide tapered transition structure 8 are set coaxially. The first matching transition structure 1 , the second matching transition structure 7 and the third matching transition structure 6 are all based on a standard rectangular waveguide narrow side height gradient transition.

The transition form of the standard rectangular waveguide port and the gap waveguide port adopts the transition form based on the narrow side height of the rectangular waveguide and the gradual transition mode based on the ridge waveguide, which are used for broadband to achieve mode conversion and impedance matching.

The terahertz low-frequency signal is input from the first standard waveguide port, and then transmitted through the first matching transition part 1 and the first ridge waveguide gradual transition part 2 to the high-low impedance low-pass filter structure 3 based on the gap waveguide. At this time, the terahertz low-frequency signal The working mode is gradually converted from the TE ₁₀ to the quasi-TEM mode, and then the terahertz low-frequency signal is transmitted along the combiner gap waveguide structure 4 through the combiner ridge waveguide gradual transition structure 5 and continues to transmit toward the combiner port. The low-pass filter structure 3 and the cube structures on both sides of the gap waveguide 4 are part of the gap waveguide, which mainly suppresses the output of electromagnetic waves to both sides.

The terahertz high-frequency signal converges to the combination gap waveguide structure 4 from the second waveguide port through the second matching transition structure 7 and the second ridge waveguide gradual transition structure 8, and also passes through the combination ridge waveguide along the combination gap waveguide structure 4 The gradual transition structure 5 continues to transmit in the direction of the third combining port.

The terahertz low-frequency signal input from the first waveguide port is transmitted to the combined gap waveguide structure 4. Since the second matching transition structure is formed based on the gradient height of the narrow side of the standard rectangular waveguide, it has the same high-pass filtering characteristics as the standard rectangular waveguide structure. The suppressed terahertz low-frequency signal is output from the second waveguide port, so the terahertz low-frequency signal input to the first waveguide port will be output from the third combined port through the combined transmission structure;

Similarly, the terahertz high-frequency signal input from the second waveguide port is transmitted to the combined gap waveguide structure 4. Since the high-low impedance low-pass filter structure 3 based on the gap waveguide has low-pass filter characteristics, the terahertz high-frequency signal will be suppressed. The signal is output to the first waveguide port, so the terahertz high-frequency signal input to the second waveguide port will also be output by the third combining port through the combining transmission structure.

As shown in Figure 2, in this example, a terahertz broadband combiner based on a gap waveguide with two waveguide bands of 0.11THz-0.17THz and 0.22THz-0.26THz is designed. From the simulation results, it can be seen that S ₃₁ is in the In the range of 0.11THz-0.17THz and S ₃₂ in the range of 0.22THz-0.26THz are about -1dB, indicating that port 1 to port 3 and port 2 to port 3 have good transmission characteristics, while S ₂₁ and S ₁₂ are less than -10dB, indicating that port 1 and port 2 have a good isolation effect.

The present invention realizes a broadband terahertz combiner by proposing a gap waveguide-based terahertz broadband combiner design, based on the gap waveguide transmission structure, using the low-pass filter characteristics of the high-low impedance transformation structure combined with the high-pass filter characteristics of the rectangular waveguide design. Compared with the existing technology, it can effectively expand the working bandwidth of the terahertz combiner. At the same time, because the structure is based on the design of the gap waveguide transmission structure, it can be processed in the open field, which reduces the difficulty of the process. In addition, with the structural characteristics of the gap waveguide itself, the assembly requirements reduce. At the same time, the gap waveguide has good high-frequency transmission characteristics, and the combination device design based on the gap waveguide structure can effectively reduce the transmission loss of the device.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (10)

1. A terahertz broadband combiner based on a gap waveguide, characterized in that it includes: a first standard waveguide port, a second standard waveguide port, a third combining port, and three matching transition structures based on waveguide narrow edge height gradients , two input ridge waveguide gradual transition structures, a low-pass filter structure, a combination gap waveguide structure and a combination ridge waveguide gradual transition structure; The first standard waveguide port is connected to the first ridge waveguide gradual transition structure (2) through the first matching transition structure (1), and then connected to the low-pass filter structure (3); the end of the low-pass filter structure (3) is connected to the combination gap waveguide Structure (4), the end of the combined gap waveguide structure (4) is connected to the combined ridge waveguide gradual transition structure (5), and the end of the combined ridge waveguide gradual transition structure (5) is connected through the third matching transition structure (6) The third combination port for outputting the terahertz signal; The second standard waveguide port is connected to the second ridge waveguide transition structure (8) through the second matching transition structure (7), and the end of the second ridge waveguide transition structure (8) is connected to the input end of the combining gap waveguide structure (4) . 2. A terahertz broadband combiner based on gap waveguides according to claim 1, characterized in that the first ridge waveguide transition structure (2) and the combined ridge waveguide transition structure (5) are symmetrical on both sides Set up the absorber. 3. A terahertz broadband combiner based on a gap waveguide according to claim 2, characterized in that the structure of the absorber (9) is a rectangular cube structure, which is used to suppress the generation of spurious modes. 4. A terahertz broadband combiner based on a gap waveguide according to claim 1, characterized in that the low-pass filter structure (3) is a high-low impedance low-pass filter structure based on a gap waveguide. 5. A kind of terahertz broadband combiner based on gap waveguide according to claim 1, characterized in that, the first matching transition structure (1), the first ridge waveguide gradual transition structure (2), low The pass filter structure (3), the combination gap waveguide structure (4), the combination ridge waveguide gradual change transition structure (5) and the third matching transition structure (6) are coaxially arranged. 6. A terahertz broadband combiner based on a gap waveguide according to claim 1, characterized in that the second matching transition structure (7) and the second ridge waveguide gradual transition structure (8) are coaxial line set. 7. A kind of terahertz broadband combiner based on gap waveguide according to claim 1, characterized in that, the first matching transition structure (1), the second matching transition structure (7) and the third matching transition structure ( 6) are based on the gradual transition of the height of the narrow side of the standard rectangular waveguide. 8. A terahertz broadband combiner based on a gap waveguide according to claim 7, characterized in that, the second matching transition structure (7) simultaneously serves as a high-pass filter to realize high-frequency signal input and low-frequency signal cut-off role. 9. A terahertz broadband combiner based on a gap waveguide according to claim 1, characterized in that the transition forms of the standard rectangular waveguide port and the gap waveguide port adopt the transition form based on the narrow side height gradient of the rectangular waveguide and the transition form of the gap waveguide port respectively. Based on the ridge waveguide gradual transition method. 10. A terahertz broadband combiner based on a gap waveguide according to claim 1, wherein the first standard waveguide port is used for inputting terahertz low-frequency signals, and the second standard waveguide port is used for inputting terahertz low-frequency signals. Hertz high-frequency signal, the third combining port is used to output the terahertz combining signal.

Images