阅读说明：本技术 一种圆极化天线 (Circularly polarized antenna ) 是由 刘虎 吕鹏 李岩 田步宁 于 2019-10-21 设计创作，主要内容包括：本发明公开了一种圆极化天线,包括：金属连接柱,辐射贴片、介质连接柱、圆形金属腔体和底座；圆形金属腔体安装在底座上；金属连接柱,辐射贴片和介质连接柱位于所述底座上、圆形金属腔体内；辐射贴片和介质连接柱通过金属连接柱螺接固定；介质连接柱底部与底座螺接固定。本发明具有损耗小、抗辐照特性好、加工成本低和便于安装的优点。(The invention discloses a circularly polarized antenna, comprising: the radiation patch comprises a metal connecting column, a radiation patch, a medium connecting column, a circular metal cavity and a base; the round metal cavity is arranged on the base; the radiation patch and the medium connecting column are positioned on the base and in the circular metal cavity; the radiation patch and the medium connecting column are fixed by a metal connecting column in a screwed connection way; the bottom of the medium connecting column is fixed with the base in a threaded manner. The invention has the advantages of small loss, good radiation resistance, low processing cost and convenient installation.)

1. A circularly polarized antenna, comprising: the radiation patch comprises a metal connecting column (1), a radiation patch (2), a medium connecting column (3), a circular metal cavity (4) and a base (5);

the round metal cavity (4) is arranged on the base (5);

the metal connecting column (1), the radiation patch (2) and the medium connecting column (3) are positioned on the base (5) and in the circular metal cavity (4);

the radiation patch (2) and the medium connecting column (3) are fixed by the metal connecting column (1) in a screwed connection way;

the bottom of the medium connecting column (3) is fixed with the base (5) in a threaded manner.

2. A circularly polarised antenna unit according to claim 1, characterised in that the radiating patch (2) is adapted to realise a circularly polarised character, comprising: the patch comprises a radiation patch body (206), and a circular mounting hole (201), N circular positioning holes (202), a first square groove (203), a C-shaped groove (204) and a second square groove (205) which are formed in the radiation patch body (206);

the circular mounting hole (201) is formed in the center of the radiation patch body (206), the C-shaped groove (204) is formed in the outer ring of the circular mounting hole (201), and the N circular positioning holes (202) are uniformly distributed in the outer ring of the C-shaped groove (204);

the radiation patch body (206), the circular mounting hole (201), the C-shaped groove (204) and the connection line of the centers of the N circular positioning holes (202) are coaxially arranged;

the first square groove (203) and the second square groove (205) are symmetrically arranged.

3. A circularly polarised antenna unit according to claim 2, characterised in that the base (5) comprises: the radio frequency connector comprises a mounting hole (501), N positioning holes (502), a radio frequency connector (503) and a base body (504);

the mounting hole (501) and the N positioning holes (502) are formed in the base body (504);

the mounting hole (501) is arranged at the center of the base body (504) and is coaxial with the base body (504);

the positions of the N positioning holes (502) on the base body (504) are arranged corresponding to the N circular positioning holes (202);

the radio frequency connector (503) is arranged on the lower side of the base body (504) and is coaxial with the mounting hole (501).

4. A circularly polarized antenna unit according to claim 3, wherein N ≧ 3.

5. A circularly polarised antenna unit according to claim 1, characterised in that the diameter of the circular metal cavity (4) is the same as the diameter of the base (5).

6. A circularly polarised antenna unit according to claim 5, characterised in that either left or right hand circular polarisation characteristics are achieved when the notch of the C-shaped slot (204) is rotated with respect to the centre of the radiating patch (2).

7. A circularly polarised antenna unit according to claim 1, characterised in that the radiating patch (2) has a diameter of 0.4 times the wavelength.

8. A circularly polarised antenna unit according to claim 1, characterised in that the perpendicular distance between the radiating patch (2) and the base (5) is 0.075 times the wavelength.

9. A circularly polarised antenna unit according to claim 1, characterised in that the base (5) has a diameter of 0.52 times the wavelength.

10. The circularly polarized antenna unit of claim 2,

the inner diameter R of the C-shaped groove (204) is 0.09 times of the wavelength, and the radian α is 90 degrees;

the width l of the square groove is 0.08 times the wavelength and the groove depth w of the square groove is 0.05 times the wavelength.

Technical Field

The invention belongs to the technical field of antennas, and particularly relates to a circularly polarized antenna.

Background

Circularly polarized antennas are widely used in satellite communication systems because they have the advantage of reducing the effects of multipath effects and faraday rotation effects. The microstrip circular polarization antenna has the advantages of low profile and light weight. For double-feed and four-feed circular polarization antennas, the circular polarization performance can be realized by performing balanced feeding on each port, but the feeding structure is complex.

For satellite communication antennas, due to the limitations of mechanical, thermal and radiation requirements, the application of microstrip antennas based on dielectric plate design is limited by the following aspects: 1) the dielectric loss of the dielectric plate reduces the radiation efficiency of the antenna; 2) the existence of the dielectric plate limits the change of the working frequency by simple scaling, and reduces the design flexibility; 3) the radiation-resistant property of the dielectric plate limits the application of the dielectric plate in a satellite-borne communication system to a certain degree. Meanwhile, for a circularly polarized antenna with a center-fed all-metal structure, the rotation direction of the unit cannot be fixed so as to meet the requirement of the array on unit polarization synthesis.

Disclosure of Invention

The technical problem of the invention is solved: the defects in the prior art are overcome, and the circularly polarized antenna has the advantages of small loss, good anti-irradiation property, low processing cost and convenience in installation.

In order to solve the above technical problem, the present invention discloses a circularly polarized antenna, including: the radiation patch comprises a metal connecting column, a radiation patch, a medium connecting column, a circular metal cavity and a base;

the round metal cavity is arranged on the base;

the radiation patch and the medium connecting column are positioned on the base and in the circular metal cavity;

the radiation patch and the medium connecting column are fixed by a metal connecting column in a screwed connection way;

the bottom of the medium connecting column is fixed with the base in a threaded manner.

The invention has the following advantages:

(1) the circularly polarized antenna adopts an all-metal structure, so that the working frequency band (capable of working in the L-K wave band) can be designed flexibly through simple scaling, the antenna can obtain wider beam width and better isolation between units, and the array can be formed conveniently to realize the wide-angle scanning characteristic.

(2) Compared with the traditional microstrip circular polarization antenna using a dielectric plate, the circular polarization antenna has the advantages of small loss, wide wave beam, small coupling, strong irradiation resistance, low processing cost, convenience in installation and the like.

(3) The circularly polarized antenna can randomly change and fix the relative rotation angle of the radiation patch relative to the floor according to the requirement of array layout, and realizes the improvement design of the circularly polarized characteristic and the scanning performance of the array, thereby obtaining the optimal polarization characteristic, the matching performance and the gain characteristic.

Drawings

Fig. 1 is a schematic structural diagram of a circular polarization antenna according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a radiation patch in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a base in an embodiment of the invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings.