CN212342813U

CN212342813U - Broadband circularly polarized double-arm spiral omnidirectional antenna

Info

Publication number: CN212342813U
Application number: CN202021020053.7U
Authority: CN
Inventors: 王玉峰; 范竣峰
Original assignee: Zhejiang Yuantu Technology Co ltd
Current assignee: Zhejiang Yuantu Technology Co ltd
Priority date: 2020-06-06
Filing date: 2020-06-06
Publication date: 2021-01-12
Anticipated expiration: 2030-06-06

Abstract

The utility model discloses a broadband circular polarization double-arm spiral omnidirectional antenna, which adopts a large-pitch double-arm spiral mode to realize horizontal omnidirectional radiation and adopts a multi-turn spiral synthesis mode to realize high gain and better omnidirectional performance; the good circular polarization axial ratio in the azimuth plane is realized through the integral optimization design of the antenna; the balanced feed and impedance matching are realized through the feed slotted line, and the broadband work of the antenna is realized; the full antenna adopts a complete short circuit mode and has a lightning protection function.

Description

Broadband circularly polarized double-arm spiral omnidirectional antenna

Technical Field

The invention relates to a double-arm helical antenna, in particular to a double-arm helical antenna for forming a high-gain omnidirectional circularly polarized antenna, which is mainly used for omnidirectional receiving and transmitting of a satellite communication ground station.

Background

The omnidirectional antenna has 360-degree wave beam coverage on the horizontal plane, instantaneous wave beam coverage can be achieved within 360-degree range in a communication system, the omnidirectional circularly polarized antenna is applied to satellite communication ground equipment more frequently, satellite incoming waves in any direction can be received conveniently, and a continuous satellite receiving effect can be obtained.

However, the omnidirectional circularly polarized antenna is usually not easy to implement, and most of conventional implementations adopt a 4-plane tilted dipole antenna array, which makes the diameter of the antenna large, and needs to be combined by a power divider, so that the cost and the implementation complexity are high, and it is difficult to implement high gain. Therefore, the utility model provides an adopt omnidirectional helical antenna of both arms spiral system realizes the improvement of gain through the mode of many rings of coiling, selects to realize better horizontal plane omnidirectionality and circular polarization performance through reasonable diameter and pitch.

Disclosure of Invention

An object of the utility model is to provide broadband circular polarization both arms spiral omnidirectional antenna, the improvement of gain is realized to the mode through the many circles coiling, selects to realize better horizontal plane omnidirectionality and circular polarization performance through reasonable diameter and pitch.

In order to achieve the purpose, the invention adopts the following technical scheme:

a pair of spiral radiators with opposite phase feed is formed by the spiral line 1 and the spiral line 2;

the spiral line 1 and the spiral line 2 are connected together through a slotted coaxial line, and the reverse feeding is realized to form an actual radiation structure;

the slotted coaxial line, the spiral line 1 and the spiral line 2 are all arranged on an antenna base 4, and the 4 coaxial lines are connected together to form an antenna with a complete short circuit structure, and the antenna has a better lightning protection function;

the omnidirectional antenna formed by winding the double-arm spiral line antenna can realize the omnidirectional gain of the antenna above 7 dBi; and the left-hand circular polarization and the right-hand circular polarization can be realized through the rotating direction of the spiral winding.

Drawings

Fig. 1 is a schematic structural diagram of a broadband circularly polarized dual-arm helical omnidirectional antenna according to the present invention;

FIG. 2 is a schematic structural view of a slotted coaxial line adopted by the present invention;

fig. 3 is a schematic diagram of the connection between the slotted coaxial line and the

spiral lines

1 and 2;

fig. 4 is a schematic view of an antenna base employed by the present invention;

fig. 5 is an azimuth plane omnidirectional pattern implemented by the present invention;

fig. 6 is a circular polarization axial ratio directional diagram of an azimuth plane implemented by the present invention;

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, a broadband circularly polarized dual-arm helical omnidirectional antenna of the present application includes a helical line 1, a helical line 2, a feed slotted line 3, and an antenna base 4.

The spiral line 1 and the spiral line 2 are symmetrically distributed coaxially and have the same rotating direction, and the spiral line 1 and the spiral line 2 are wound from a starting point at the same height to an end point at the same height; the spiral line 1 and the spiral line 2 adopt reversed phase feed, the spiral line 1 is simultaneously connected with a core wire and a rubber wire of the feed slotted line 3, and the spiral line 2 is connected with the rubber wire of the feed slotted line 3;

the helix 1, the helix 2 and the feed slotted line 3 are in short circuit connection through the antenna base 4 to form a short circuit structure, and the utility model is formed;

referring to fig. 2, a feed slotted line 3 of the broadband circularly polarized dual-arm helical omnidirectional antenna of the present application includes a radio frequency connector 3-1, a slotted coaxial line 3-2, and a choke magnetic ring 3-3, one end of which is a coaxial open end, an outer conductor of the open end has a slot, the slot depth can be selected within about 1mm to 1000mm, and the slot depth generally corresponds to about 0.25 times of the operating wavelength; the choke magnetic ring 3-3 is arranged at the bottom of the slotted position of the slotted coaxial line 3-2 to play a role in choking; the outer conductor of the slotted end of the slotted coaxial wire 3-2 of the slotted coaxial wire 3 is connected with the spiral wire 2, and the core wire of the slotted coaxial wire 3-2 is connected with the spiral wire 1 after being in short circuit with the outer conductor; the slotted coaxial line is arranged in the antenna base 4, and the radio frequency connector 3-1 of the slotted coaxial line penetrates out of the antenna base 4;

referring to fig. 3, the antenna base 4 is a side-view i-shaped disc structure, and includes: an upper disc 4-1, a support cylinder 4-2 and a base 4-3; the upper disc 4-1 is connected with the lower disc 4-2 through the supporting cylinder 4-2; the upper disc 4-1 is connected with the winding starting points of the spiral line 1 and the spiral line 2, the lower disc 4-3 is connected with the feed coaxial line 3, and the radio frequency connector 3-1 of the feed coaxial line 3 penetrates through the lower disc 4-3 and is connected with the lower disc 4-3 through a flange;

referring to fig. 4 and 5, the embodiment of the present invention can obtain a better right-hand circularly polarized omnidirectional pattern with out-of-roundness less than 2 dB; the gain of the azimuth plane can reach more than 7 dBi; the circular polarization axial ratio of the azimuth plane is less than 3 dB.

Claims

1. Broadband circular polarization both arms spiral omnidirectional antenna, its characterized in that includes: the antenna comprises a spiral line (1), a spiral line (2), a feed slotted line (3) and an antenna base (4);

the helix line [1] and the helix line [2] form a main radiator part of the helical antenna;

the feed slotted line [3] is a feed part of the helical antenna, which feeds the helical line in reverse phase and plays a role of conversion from unbalance to balance;

the antenna base [4] is a spiral antenna structure and an installation flange part, the bottoms of the spiral lines [1] and the spiral lines [2] can be fixed on the antenna base, and the antenna can be conveniently installed on a carrier through the installation flange of the base part;

the antenna carries out radio frequency output through a radio frequency output joint of the feed slotted line [3 ].

2. The broadband circularly polarized dual-arm spiral omnidirectional antenna as claimed in claim 1, wherein the spiral line [1] and the spiral line [2] form a main radiator part of the spiral antenna, the spiral line [1] and the spiral line [2] need to be fed in opposite phases, and the starting point and the ending point of the spiral line [1] and the spiral line [2] are consistent in height position; the winding direction of the spiral line determines the polarization direction of the antenna; the winding end points of the spiral line (1) and the spiral line (2) are short-circuited and fixed on the antenna base (4).

3. The broadband circularly polarized bifilar-helix omnidirectional antenna according to claim 1, wherein said feed slotline [3] passes through the whole helix portion from the bottom of the antenna, feeding both helices at the top of the helix; the helix line [1] is connected with the core wire and the sheath wire of the grooving line at the same time, and the helix line [2] is connected with the sheath of the grooving line; the bottom of the slotted coaxial line is arranged on the antenna base (4).

4. The broadband circularly polarized dual-arm helical omnidirectional antenna according to claim 1, wherein the antenna base [4] is of a metal structure and is connected with the helix line [1], the helix line [2] and the feed slot line [3 ]; the winding end points of the spiral line [1] and the spiral line [2] are connected to the antenna base, and the radio frequency joint of the feed slotted line [3] is fixed at the center of the antenna base through a structural flange and passes through the antenna base to be output.