Low frequency high bandwidth microstrip antenna

Abstract

The utility model relates to antenna technical field, especially low frequency high bandwidth microstrip antenna, including PCB board, the front surface of PCB board is provided with front surface circuit layer, the back of PCB board is provided with back surface circuit layer, and the front surface circuit layer and back surface circuit layer electricity lead through, the front surface circuit layer includes two symmetrical front surface branch, and the front surface branch includes first horizontal branch and second horizontal branch, is provided with oblique line on first horizontal branch, and the one end of second horizontal branch is connected with second vertical branch perpendicularly, and the end of second vertical branch is provided with arc line, one end of back surface circuit layer is connected with the place of feeding, and the place of feeding is used for feeding to antenna. Compared with prior art, the utility model discloses low frequency high bandwidth microstrip antenna through multiple branch coupling feed, thereby constitute a kind of high bandwidth low frequency antenna, with low profile, with good flat structure, area is smaller, can be applicable to miniaturization design requirement.

Description

[Technical Field] This utility model relates to the field of antenna technology, and in particular to low-frequency high-bandwidth microstrip antennas. [Background Technology] With the development of my country's economy and society and the improvement of its technological level, various wireless communication products have emerged, and people's pursuit of wireless performance is becoming increasingly demanding. Therefore, antennas play a particularly important role in receiving and transmitting signals.

[0001] Microstrip antennas are increasingly favored for their low profile, integrability, and ease of arraying. However, existing microstrip antennas have a narrow low-frequency bandwidth, which cannot meet the requirements for low-frequency performance and miniaturization. [Utility Model Content] To overcome the above problems, this utility model proposes a low-frequency, high-bandwidth microstrip antenna that can effectively solve the above problems.

[0002] The present invention provides a technical solution to solve the above-mentioned technical problems by providing a low-frequency, high-bandwidth microstrip antenna, including a PCB board. A front circuit layer is provided on the front side of the PCB board, and a back circuit layer is provided on the back side of the PCB board. The front circuit layer and the back circuit layer are electrically connected. The front circuit layer includes two symmetrically arranged front branches, each including a first horizontal branch and a second horizontal branch. A diagonal line is provided on the first horizontal branch, and a second vertical branch is vertically connected to one end of the second horizontal branch. An arc is provided at the end of the second vertical branch. One end of the back circuit layer is connected to a feed point for feeding the antenna. Preferably, the front branch includes a vertical main branch, the first horizontal branch and the second horizontal branch are respectively vertically connected to the same side of the main branch, and the second horizontal branch is located above the first horizontal branch.

[0003] Preferably, the end of the first transverse branch is vertically connected to a first vertical branch.

[0004] Preferably, the back-side wiring layer includes a back-side branch, the back-side branch is a first strip branch, and the power supply is connected to the first strip branch.

[0005] Preferably, one end of the first strip-shaped branch is vertically connected to a second strip-shaped branch, one end of the second strip-shaped branch is vertically connected to a third strip-shaped branch, one end of the third strip-shaped branch is vertically connected to a fourth strip-shaped branch, and one end of the fourth strip-shaped branch is vertically connected to a fifth strip-shaped branch.

[0006] Preferably, the PCB board is an FR4 PCB board with a thickness of 1mm.

[0007] Preferably, the front circuit layer and the back circuit layer are copper foil layers.

[0008] Compared with the prior art, the low-frequency high-bandwidth microstrip antenna of this invention is a high-bandwidth low-frequency antenna formed by coupling and feeding through multiple stubs. It has a low profile, a good flat-mount structure, and a small area, making it suitable for miniaturized design requirements. [Attached Image Description] Fig. 1 This is a front view of the low-frequency, high-bandwidth microstrip antenna of this utility model; Fig. 2 This is a front-side circuit layer structure diagram of the low-frequency, high-bandwidth microstrip antenna of this utility model; Fig. 3 This is a rear view of the low-frequency, high-bandwidth microstrip antenna of this utility model.

Detailed Implementation Methods

[0009] It should be noted that in this embodiment of the invention, all directional indications (such as up, down, left, right, front, back, etc.) are limited to relative positions on the specified view, rather than absolute positions.

[0010] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0011] Please see Figs. 1 to 3 The low-frequency high-bandwidth microstrip antenna of this utility model includes a PCB board 10. A front circuit layer 20 is provided on the front side of the PCB board 10, and a back circuit layer 30 is provided on the back side of the PCB board 10. The front circuit layer 20 and the back circuit layer 30 are electrically connected.

[0012] The front-side circuit layer 20 includes two symmetrically arranged front-side branches 22. Each front-side branch 22 includes a first horizontal branch 222 and a second horizontal branch 225. A diagonal line 224 is provided on the first horizontal branch 222. One end of the second horizontal branch 225 is vertically connected to a second vertical branch 226, and the end of the second vertical branch 226 is provided with an arc 227. The diagonal line 224 creates a gradual transition from narrow to wide for this branch, increasing low-frequency bandwidth. The arc 227 also contributes to increasing bandwidth.

[0013] The front-side line layer 20 has 4 branches, each corresponding to a frequency band, with the longer one corresponding to 400MHz and the shorter one corresponding to 900MHz.

[0014] One end of the back-side circuit layer 30 is connected to a power supply 60, which is used to power the antenna.

[0015] The front branch 22 includes a vertical main branch 221, the first horizontal branch 222 and the second horizontal branch 225 are respectively vertically connected to the same side of the main branch 221, and the second horizontal branch 225 is located above the first horizontal branch 222.

[0016] The first horizontal branch 222 is vertically connected to the end of the first vertical branch 223.

[0017] The back-side wiring layer 30 includes a back-side branch, the back-side branch is a first strip branch 31, and the power supply 60 is connected to the first strip branch 31.

[0018] One end of the first strip-shaped branch 31 is vertically connected to a second strip-shaped branch 32, one end of the second strip-shaped branch 32 is vertically connected to a third strip-shaped branch 33, one end of the third strip-shaped branch 33 is vertically connected to a fourth strip-shaped branch 34, and one end of the fourth strip-shaped branch 34 is vertically connected to a fifth strip-shaped branch 35. The back-side branches are excited by the feed point 60, and electromagnetic waves are coupled and fed to multiple branches through the bent branches to achieve multi-frequency bands.

[0019] During operation, the electromagnetic waves are coupled from the 60 stubs at the feed point to the stubs on the back side, and then transmitted into space through the stubs on the front side of the antenna.

[0020] The PCB board 10 is a 1mm thick FR4 PCB board.

[0021] The front circuit layer 20 and the back circuit layer 30 are copper foil layers.

[0022] Compared with the prior art, the low-frequency high-bandwidth microstrip antenna of this invention is a high-bandwidth low-frequency antenna formed by coupling and feeding through multiple stubs. It has a low profile, a good flat-mount structure, and a small area, making it suitable for miniaturized design requirements.

[0023] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. Any modifications, equivalent substitutions and improvements made within the concept of the present utility model should be included within the patent protection scope of the present utility model.

Claims

1. A low-frequency, high-bandwidth microstrip antenna, characterized in that, The PCB board includes a front circuit layer on the front side and a back circuit layer on the back side, wherein the front circuit layer and the back circuit layer are electrically connected. The front circuit layer includes two symmetrically arranged front branches. The front branches include a first horizontal branch and a second horizontal branch. The first horizontal branch has a diagonal line. One end of the second horizontal branch is vertically connected to a second vertical branch. The end of the second vertical branch has an arc. One end of the back-side circuit layer is connected to a power supply point, which is used to power the antenna.

2. The low-frequency, high-bandwidth microstrip antenna as described in claim 1, characterized in that, The front branch includes a vertical main branch, and the first and second transverse branches are respectively vertically connected to the same side of the main branch, with the second transverse branch located above the first transverse branch.

3. The low-frequency, high-bandwidth microstrip antenna as described in claim 1, characterized in that, The first horizontal branch is vertically connected to the end of the first vertical branch.

4. The low-frequency, high-bandwidth microstrip antenna as described in claim 1, characterized in that, The back-side wiring layer includes a back-side branch, the back-side branch has a first strip branch, and the power supply is connected to the first strip branch.

5. The low-frequency, high-bandwidth microstrip antenna as described in claim 4, characterized in that, One end of the first strip-shaped branch is vertically connected to a second strip-shaped branch, one end of the second strip-shaped branch is vertically connected to a third strip-shaped branch, one end of the third strip-shaped branch is vertically connected to a fourth strip-shaped branch, and one end of the fourth strip-shaped branch is vertically connected to a fifth strip-shaped branch.

6. The low-frequency, high-bandwidth microstrip antenna as described in claim 1, characterized in that, The PCB board is a 1mm thick FR4 PCB board.

7. The low-frequency, high-bandwidth microstrip antenna as described in claim 1, characterized in that, The front and back circuit layers are copper foil layers.

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