Tightened wide-axial-ratio beam width circularly polarized microstrip antenna

Abstract

The invention, which relates to the microstrip antenna design field, discloses a compact wide-axial-ratio beam width circular polarization microstrip antenna comprising an antenna unit provided with a feed port, a microstrip line and a resonant ring; the microstrip line is used for ensuring radiation of the feed port and tuning effect of the antenna; the resonant ring is used for radiating energy of the feed port into a free space; by adjusting the width of the resonant ring, the axial ratio beam width is widened. According to the invention, the axial ratio in the whole wide pitch angle can be optimized by adjusting the geometric structure of the resonant ring, and the numerical value of the axial ratio is reduced; meanwhile, through the combination of the resonant ring and the microstrip line, the surface current distribution and the electric field distribution of the microstrip line of the upper plate are inhibited and adjusted, so that the main polarization gain of the antenna is adjusted.

Description

Technical Field

[0001] The invention relates to the field of microstrip antenna design, and in particular to a compact wide-axis ratio beam width circularly polarized microstrip antenna. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

[0003] Compact circularly polarized microstrip antennas are widely used in communication and navigation systems due to their low profile advantages. In satellite navigation and communication systems, circularly polarized antennas are widely used as low-profile cross-polarization gain antennas to reduce multipath interference and improve the quality of satellite communications.

[0004] In recent years, a large number of broadband circularly polarized antennas have been proposed by researchers, among which microstrip antennas have been widely used. Although circularly polarized antennas have been widely proposed in recent years, their axial ratio reduction methods and design structures for low axial ratios cannot be widely used. Increasing the axial ratio to meet the requirements and how to reduce the axial ratio within the low elevation angle range and suppress the cross-polarization of the antenna are still necessary issues faced by current circularly polarized antenna designers. Summary of the invention

[0005] The purpose of the present invention is to provide a compact wide axial ratio beam width circularly polarized microstrip antenna to solve the problems existing in the prior art, so as to achieve linear adjustment of the axial ratio beam width in the main direction through a certain structure in the entire antenna, thereby solving the above problems.

[0006] The technical solution of the present invention is as follows:

[0007] A compact wide axial ratio beam width circularly polarized microstrip antenna comprises: an antenna unit, on which a feeding port, a microstrip line and a resonant ring are arranged; the microstrip line is used to ensure the radiation of the feeding port and the tuning effect of the antenna; the resonant ring is used to radiate the energy of the feeding port into the free space; and the axial ratio beam width is widened by adjusting the width of the resonant ring.

[0008] Furthermore, the antenna unit includes: a bottom plate, a first dielectric plate is arranged above the bottom plate, and a second dielectric plate is arranged on the first dielectric plate.

[0009] Furthermore, the feeding port is two copper core cylinders, and the copper core cylinders penetrate the bottom plate, the first dielectric plate and the second dielectric plate.

[0010] Furthermore, the microstrip line includes: an upper plate microstrip line and a lower plate microstrip line; the upper plate microstrip line is arranged on the second dielectric plate and serves as a radiation excitation; the lower plate microstrip line is arranged on the first dielectric plate and serves as a feeding function.

[0011] Furthermore, the upper plate microstrip line comprises a combination of a rectangular patch and a circular patch.

[0012] Furthermore, the lower plate microstrip line is a scaled-down version of the upper plate microstrip line.

[0013] Furthermore, the resonant ring is arranged on the second dielectric plate and surrounds the entire upper plate microstrip line.

[0014] Furthermore, the feeding port is connected to the signal line through a connecting line.

[0015] Furthermore, the antenna unit is provided with a fixing hole for fixing the position of the feeding port.

[0016] Furthermore, the fixed feeding port is fixed by a port filling medium.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention can optimize the axial ratio within the entire wide pitch angle and reduce the value of the axial ratio by adjusting the geometric structure of the resonant ring.

[0019] 2. The present invention can suppress and adjust the surface current distribution and electric field distribution of the upper plate microstrip line through the combination of the resonant ring and the microstrip line, thereby adjusting the main polarization gain of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view of a compact wide axial ratio beam width circularly polarized microstrip antenna;

[0021] Figure 2 It is a side view of a compact wide axial ratio beam width circularly polarized microstrip antenna;

[0022] Figure 3 It is an axonometric diagram of a compact wide axial ratio beamwidth circularly polarized microstrip antenna;

[0023] Figure 4 The figure is a schematic diagram of a 2*2 antenna array formed by the antennas proposed by the present invention.

[0024] Figure numerals: 1 - feeding port, 2 - resonant ring, 3 - fixing hole, 4 - port filling medium, 5 - upper plate microstrip line, 6 - lower plate microstrip line, 7 - connecting line. DETAILED DESCRIPTION

[0025] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0026] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0027] Embodiment 1

[0028] In order to solve the problems existing in the current technology, this embodiment proposes a compact wide-axis ratio beamwidth circularly polarized microstrip antenna, which can suppress cross-polarization in a wide angle range and increase the main polarization gain of the antenna.

[0029] For details, please refer to Figure 1-3 , a compact wide-axis ratio beamwidth circularly polarized microstrip antenna, specifically comprising the following structure:

[0030] An antenna unit, wherein the antenna unit is provided with a feeding port 1, a microstrip line and a resonant ring 2;

[0031] The microstrip line is used to ensure the radiation of the feeding port 1 and the tuning effect of the antenna;

[0032] The resonant ring 2 is used to radiate the energy of the feeding port 1 into free space;

[0033] By adjusting the width of the resonant ring 2, the axial ratio beam width is widened.

[0034] In this embodiment, specifically, the antenna unit includes:

[0035] A bottom plate, a first dielectric plate is arranged above the bottom plate, and a second dielectric plate is arranged on the first dielectric plate.

[0036] In this embodiment, specifically, the feeding port 1 is two copper core cylinders, and the copper core cylinders penetrate the bottom plate, the first dielectric plate and the second dielectric plate, that is, penetrate the upper and lower surfaces of the entire antenna structure.

[0037] In this embodiment, specifically, the microstrip line includes:

[0038] Microstrip line 5 on the upper plate and microstrip line 6 on the lower plate;

[0039] The upper plate microstrip line 5 is arranged on the second dielectric plate (i.e., located on the upper part of the antenna) as a radiation excitation;

[0040] The lower plate microstrip line 6 is arranged on the first dielectric plate (ie, located at the lower part of the antenna) to play a feeding role.

[0041] In this embodiment, specifically, the upper plate microstrip line 5 comprises a combination of a rectangular patch and a circular patch, and the material is metal.

[0042] In this embodiment, specifically, the lower plate microstrip line 6 is a scaled-down version of the upper plate microstrip line 5 .

[0043] In this embodiment, specifically, the resonant ring 2 is disposed on the second dielectric plate (ie, disposed on the upper surface of the antenna) and surrounds the entire upper plate microstrip line 5, and is specifically made of metal.

[0044] In this embodiment, specifically, the feeding port 1 is connected to the signal line through a connecting line 7 .

[0045] In this embodiment, specifically, a fixing hole 3 is provided on the antenna unit for fixing the position of the feeding port 1 .

[0046] In this embodiment, specifically, the fixed feeding port 1 is fixed by a port filling medium 4 , and the stability of the feeding port 1 is increased.

[0047] See also Figure 4 This embodiment is also based on the above-mentioned antennas, and is combined to form a 2*2 antenna array.

[0048] The above-mentioned embodiments only express the specific implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the protection scope of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the technical solution concept of the present application, and these all belong to the protection scope of the present application.

[0049] This background section is provided to generally present the context of the invention, and the work of the presently named inventors, the work to the extent described in this background section, and aspects of this section that did not constitute prior art at the time of application are neither explicitly nor implicitly admitted to be prior art to the present invention.

Claims

1. A compact wide-axis ratio beamwidth circularly polarized microstrip antenna, characterized in that: include: An antenna unit, wherein a feeding port (1), a microstrip line and a resonant ring (2) are provided on the antenna unit; The microstrip line is used to ensure the radiation of the feeding port (1) and the tuning effect of the antenna; the resonant ring (2) is used to radiate the energy of the feeding port (1) into the free space; and the axial ratio beam width is widened by adjusting the width of the resonant ring (2).

2. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 1, characterized in that: The antenna unit comprises a bottom plate, a first dielectric plate is arranged above the bottom plate, and a second dielectric plate is arranged on the first dielectric plate.

3. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 2, characterized in that: The feeding port (1) is two copper core cylinders, and the copper core cylinders penetrate the bottom plate, the first dielectric plate and the second dielectric plate.

4. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 2, characterized in that: The microstrip line comprises: an upper plate microstrip line (5) and a lower plate microstrip line (6); the upper plate microstrip line (5) is arranged on the second dielectric plate and serves as a radiation excitation; the lower plate microstrip line (6) is arranged on the first dielectric plate and serves as a feeding function.

5. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 4, characterized in that: The upper plate microstrip line (5) comprises a combination of a rectangular patch and a circular patch.

6. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 5, characterized in that: The lower plate microstrip line (6) is a scaled-down version of the upper plate microstrip line (5).

7. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 2, characterized in that: The resonant ring (2) is arranged on the second dielectric plate and surrounds the entire upper plate microstrip line (5).

8. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 1, characterized in that: The feeding port (1) is connected to the signal line via a connecting line (7).

9. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 2, characterized in that: The antenna unit is provided with a fixing hole (3) for fixing the position of the feeding port (1).

10. The compact wide-axis ratio beamwidth circularly polarized microstrip antenna according to claim 9, characterized in that: The fixed feeding port (1) is fixed by a port filling medium (4).

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