TWI408845B - Complex antenna - Google Patents

Abstract

A complex antenna, includes a PCB, a cable, a radiation metal line and a grounding metal line locating on the top surface of the PCB. The radiation metal line includes a number of sub-metal lines. The sub-metal lines include linear structure lines and convoluted structure lines, the aforementioned lines being in the alternate set. The grounding metal line has the n shape structure. The cable include an inner conductor electrically connects with the end of the radiation metal line and a outer conductor electrically connects with the grounding metal line.

Description

Composite antenna

The present invention relates to a composite antenna, particularly a high gain antenna that can be applied to wireless access technology.

With the rapid development of the wireless communication industry, the application of wireless local area network (WLAN) and global interoperable microwave access (WiMAX) is becoming more and more widespread. Therefore, the antenna design with high gain is also receiving more and more attention. At the same time, in order to reduce production costs and increase efficiency, we must also consider the improvement of its production methods and structure. Taiwan Patent Publication No. TW 542427 discloses an omnidirectional planar monopole antenna which attaches the radiating portion and the ground portion of the antenna to the front and back sides of the PCB to reduce the size of the antenna, but is located at the grounding portion. A microstrip transmission line structure is formed between the location and the feed point at the radiating portion, thereby increasing the loss of transmission of the antenna at a high frequency band, resulting in an unsatisfactory antenna performance.

In the present invention, a planar composite antenna design with high gain is proposed, which designs the radiation portion and the ground portion in the same plane to improve the antenna performance, and changes the shape of the ground portion to reduce the size of the antenna, thereby enabling the antenna to reach Miniaturized high performance.

It is an object of the present invention to provide a composite antenna which is formed on a printed circuit board and which has the effect of miniaturization and high performance.

In order to achieve the above object, the composite antenna of the present invention is achieved in the following manner:

A composite antenna comprising: a printed circuit board, a radiating metal wire on a surface of the printed circuit board, a grounding metal wire, and a feed line; the radiating metal wire extending from one end of the printed circuit board And comprising a plurality of sub-metal wires connected in sequence, the sub-metal wires comprising a linear structure and a continuously bent meandering structure, wherein the linear structure and the meandering structure are alternately arranged; the grounding metal wire is substantially "n" And at one end of the upper surface of the printed circuit board; the feed line is a coaxial line, and the inner conductor is electrically connected to one end of the radiating metal line adjacent to the grounding metal line, and the metal braid layer and the grounding metal line are electrically connected Sexual connection.

Compared with the prior art, the present invention has the effect of reducing the size of the antenna and improving the stability of the antenna.

The invention will now be further described with reference to the drawings and preferred embodiments.

100‧‧‧Composite antenna

1‧‧‧PCB

11‧‧‧ upper surface

2‧‧‧radiation wire

21‧‧‧First sub-metal wire

22‧‧‧Second sub-metal wire

23‧‧‧ Third sub-metal wire

24‧‧‧ fourth sub-metal wire

25‧‧‧ fifth sub-metal wire

26‧‧‧Feeding point

3‧‧‧Grounding wire

31‧‧‧First grounding wire

32‧‧‧Second grounding wire

33‧‧‧ Grounding point

4‧‧‧ feeder

41‧‧‧ Inner conductor

42‧‧‧Insulation

43‧‧‧metal braid

44‧‧‧Outer insulation

The first figure is a perspective view of a composite antenna of the present invention.

The second figure is a voltage standing wave ratio diagram of the composite antenna of the present invention.

Referring to the first figure, the composite antenna 100 can work in a WLAN (Wireless Local Area Network), which includes a PCB (Printed Circuit Board) 1, a radiating metal line 2, and a grounding metal line 3. And feeder 4. The aforementioned PCB 1 has an upper surface 11. The aforementioned radiating metal wire 2 and the aforementioned grounding metal wire 3 are both on the upper surface 11 of the PCB 1. The radiant metal line 2 mainly includes a first sub-metal line 21, a second sub-metal line 22, a third sub-metal line 23, a fourth sub-metal line 24, and a fifth sub-metal line 25. The first sub-metal line 21 extends in a direction away from the grounding metal line 3, and has a length substantially equal to a quarter wavelength of the center operating frequency of the antenna, and an feeding point of an antenna is disposed at an end of the grounding metal line 3 adjacent to the ground. 26. The second sub-metal wire 22 is a bent meandering structure, which receives the end of the first sub-metal wire 21 and has at least 3 bends, and the total bending path is about 1/2 wavelength of the central operating frequency of the antenna; The third sub-metal wire 23 receives the end of the second sub-metal wire 22 and continues to extend away from the grounding metal wire 3, and the length thereof is approximately 1/2 wavelength of the central operating frequency of the antenna; The sub-metal wire 24 receives the same end of the third sub-metal wire 25 as the second sub-metal wire 22, and has a bending of at least 3 times, and the total bending path is about 1/2 wavelength of the central operating frequency of the antenna; The fifth sub-metal wire 25 extends from the end of the fourth sub-metal wire 24 in a direction away from the grounding metal wire 3, and has a length substantially 1/2 to 3/4 wavelength of the central operating frequency.

The grounding metal wire 3 is located at one end of the upper surface 11 of the PCB 1, which corresponds to the ground portion of the composite antenna 100. The grounding wire 3 has an "n" shape and includes a first grounding wire 31 adjacent to the aforementioned radiating metal wire 2 and a second grounding wire 32 on both sides. A grounding point 33 is disposed in the first grounding wire 31. In this embodiment, the two ends of the first grounding wire 31 are perpendicularly connected to the second grounding wire 32. In other embodiments, the first grounding wire 31 can pass through the linear or arc-shaped metal wire and the second grounding wire. 32 connections.

The feed line 4 is a coaxial line, and includes an inner conductor 41 electrically connected to the feed point 26 of the radiant metal line 2, an inner insulating layer 42 covering the outer conductor 41, and electrically connected to the ground metal line 3 The metal braid 43 of the upper grounding point 33 and the outermost insulating layer 44 are coated.

Referring to the second figure, the composite antenna of the present invention can operate in the operating band of 5150 MHz to 5850 MHz of the wireless local area network.

The radiant metal line 2 and the ground metal line 3 in this embodiment are formed on the PCB 1 by an etching technique. Of course, the present invention can also use other dielectric substrates (such as FPC) instead of the PCB to achieve the same effect.

100‧‧‧Composite antenna

1‧‧‧PCB

11‧‧‧ upper surface

2‧‧‧radiation wire

21‧‧‧First sub-metal wire

22‧‧‧Second sub-metal wire

23‧‧‧ Third sub-metal wire

24‧‧‧ fourth sub-metal wire

25‧‧‧ fifth sub-metal wire

26‧‧‧Feeding point

3‧‧‧Grounding wire

31‧‧‧First grounding wire

32‧‧‧Second grounding wire

33‧‧‧ Grounding point

4‧‧‧ feeder

41‧‧‧ Inner conductor

42‧‧‧Insulation

43‧‧‧metal braid

44‧‧‧Outer insulation

Claims (13)

A composite antenna comprising: a printed circuit board; a grounding metal wire located at the other end of the upper surface of the printed circuit board, generally in the shape of an "n"; and a radiating metal wire on the upper surface of the printed circuit board, from the printed circuit Extending at one end of the plate, comprising a plurality of sub-metal wires sequentially connected, the sub-metal wires comprising a linear structure and a continuously bent meandering structure, wherein the linear structures are alternately arranged with the meandering structure, the plurality of sub-metals The wire includes a first sub-metal wire, a second sub-metal wire, and a third sub-metal wire, and the third sub-metal wire receives the second sub-metal wire end and continues to extend away from the grounding metal wire, and the length thereof is substantially The antenna is operated at a frequency of 1/2 wavelength; the feed line is a coaxial line, and the inner conductor is electrically connected to one end of the radiating metal line adjacent to the grounding metal line, and the metal braid is electrically connected to the grounding metal line. . The composite antenna according to claim 1, wherein the plurality of sub-metal wires further include a fourth sub-metal wire and a fifth sub-metal wire, wherein the first, third, and fifth sub-metal wires are linear structures. The second and fourth sub-metal wires are continuously bent meandering structures. The composite antenna of claim 2, wherein the first sub-metal wire of the radiant metal wire extends in a direction away from the ground metal wire. The composite antenna according to claim 3, wherein the length of the first sub-metal wire is approximately 1/4 wavelength of the central operating frequency of the antenna. The composite antenna of claim 4, wherein the second sub-metal wire of the radiant metal wire receives the end of the first sub-metal wire and has at least three bends, and the total bending path of the second sub-metal wire It is about 1/2 wavelength of the operating frequency of the center of the antenna. The composite antenna according to claim 5, wherein the fourth sub-metal wire receives the third antenna The end of the sub-metal wire is the same as the arrangement of the second sub-metal wire, and has a bending of at least three times, and the total bending path is about 1/2 wavelength of the center operating frequency of the antenna. The composite antenna according to claim 6, wherein the fifth sub-metal wire extends from the end of the fourth sub-metal wire in a direction away from the grounding metal wire, and the length thereof is approximately 1/2~3 of the central operating frequency. /4 wavelength. The composite antenna according to claim 1, wherein the radiation metal wire and the ground metal wire are formed on the printed circuit board by an etching technique. The composite antenna according to claim 7 or 8, wherein the radiation metal wire is provided at a feeding end of the grounding metal wire to a feeding point electrically connected to the inner conductor of the feeding wire. The composite antenna according to claim 9, wherein the grounding metal wire is provided with a grounding point electrically connected to the metal braid of the feeding line adjacent to the radiating metal wire. The composite antenna according to claim 1, wherein the grounding metal wire comprises a first grounding wire adjacent to the radiating metal wire and a pair of second grounding wires respectively located at two sides of the first grounding wire. The composite antenna according to claim 11, wherein the second ground line is vertically connected to the first ground line. The composite antenna according to claim 11, wherein the second grounding wire is connected to the first grounding metal wire by a straight-line or circular-shaped metal wire.