CN112164884A

CN112164884A - A Spaceborne Helical Array Antenna Feed Probe with Consistent Multiple Degrees of Freedom Amplitude

Info

Publication number: CN112164884A
Application number: CN202010852066.9A
Authority: CN
Inventors: 艾永强; 牛宝华; 张振杰; 王超; 杨文丽; 郑伟; 穆楠
Original assignee: Xian Institute of Space Radio Technology
Current assignee: Xian Institute of Space Radio Technology
Priority date: 2020-08-21
Filing date: 2020-08-21
Publication date: 2021-01-01
Anticipated expiration: 2040-08-21
Also published as: CN112164884B

Abstract

The invention relates to a multi-degree-of-freedom amplitude-phase consistent spaceborne spiral array antenna feed probe, which comprises a feed rod and a feed column, wherein the feed rod is connected with the feed column; the upper end surface of the feed column is provided with a U-shaped groove, and the center of the feed column is provided with a V-shaped inner cavity; the feed rod is fixedly arranged in a conductor in the feed network, the feed column is embedded into the U-shaped groove by using the V-shaped inner cavity of the feed rod top end cylindrical positioning device, the end part of the spiral line is tangent to the excircle of the feed column, and the welding flux is filled into the V-shaped inner cavity of the feed column in the welding process until the V-shaped groove is filled.

Description

Satellite-borne spiral array antenna feed probe with multiple degrees of freedom and consistent amplitude and phase

Technical Field

The invention relates to a multi-degree-of-freedom amplitude-phase-consistent satellite-borne spiral array antenna feed probe, and belongs to the technical field of antenna structures.

Background

The spiral array antenna is sensitive to amplitude and phase errors of each spiral unit in the beam forming design, the traditional feeder is lapped with the feed probe, the randomness of the positions of the spiral line and the feed probe is large, the shapes of welding spots are inconsistent, the amplitude and phase distribution is difficult to guarantee, near-field amplitude and phase channel testing is required, a compensation phase link is additionally added, the debugging and testing period is long, and the efficiency is low.

Disclosure of Invention

The technical problem solved by the invention is as follows: the defects of the prior art are overcome, the satellite-borne spiral array antenna feed probe with multiple degrees of freedom and consistent amplitude is provided, and the consistency, reliability and operability of products are improved.

The technical scheme of the invention is as follows: a multi-degree-of-freedom satellite-borne spiral array antenna feed probe with consistent amplitude and phase comprises a feed rod and a feed column; the upper end face of the feed post is provided with a U-shaped groove, the groove width is the same as the chord height of the embedded spiral line part, the groove depth is the same as the diameter of the spiral line, an inner cavity with an included angle of 15 degrees +/-1 degrees is arranged at the center, and the bottom of the feed post is provided with a cylindrical groove which is positioned with the feed post boss and adjusts the direction of the U-shaped groove; the feeding post is fixedly arranged in a feed network inner conductor, the feeding post is positioned and arranged in the V-shaped inner cavity by using a cylindrical groove and a feeding post top end cylinder, the direction of the U-shaped groove is adjusted to be consistent with the direction of the spiral line, the spiral line is embedded into the U-shaped groove, the end part of the spiral line is tangent to the excircle of the feeding post, and the welding flux is filled into the V-shaped inner cavity of the feeding post until the V-shaped inner cavity is full of the welding flux.

Preferably, when the feed rod, the feed column and the spiral line are welded, welding points are located in the V-shaped grooves in the feed column, the shapes of the welding points are regular, and the states of the welding points are consistent.

Preferably, the top end of the feed rod is in a threaded design.

Preferably, the lower end face of the feed column is provided with an observation hole and an exhaust hole, so that the welding state can be observed conveniently, and the exhaust is facilitated.

Preferably, the diameter of the observation hole and the exhaust hole is phi 0.6.

A method for connecting the probe and the satellite-borne side-fed spiral antenna comprises the following steps:

(1) after the feed network and the reflecting cup are arranged in the reflecting plate, the feed rod is arranged in the feed network inner conductor through threaded connection and fixed, and a flat port at the upper end of the feed rod is used for applying a fixed torque;

(2) the spiral antenna is arranged in the components and fixed, the feed column is positioned and arranged by using a column at the top end of the feed rod, the direction of a U-shaped groove of the feed column is adjusted to be consistent with the direction of a spiral line, the spiral line is embedded into the U-shaped groove, and the end head of the spiral line is tangent to the feed column;

(3) and (3) welding and filling the feeding column V-shaped groove, and observing the condition of the welding flux through the observation hole in the welding process to judge the welding state so as to finish welding.

According to the method for improving the working efficiency of the spiral array antenna, the probe is connected with the satellite-borne side-fed spiral antenna according to the connection mode, so that the symmetry of an amplitude directional diagram of the spiral array antenna is improved, and the phase center fluctuation of the spiral array antenna is reduced.

Compared with the prior art, the invention has the beneficial effects that:

the feed rod and feed column split structure and the spiral line embedded welding design are adopted, the consistency of welding positions is good, the welding strength is high, the welding is convenient, the consistency, reliability and operability of the welding positions are improved, meanwhile, the symmetry of an amplitude directional diagram of the spiral array antenna is greatly improved, the phase center fluctuation of the spiral array antenna is reduced, and the working efficiency of the spiral array antenna is improved.

The invention has been applied to a plurality of satellite-borne array surface antennas in China, has been examined and used on-orbit through mechanics, thermal shock, thermal vacuum evaluation levels, and has referred to the connection mode of the satellite-borne side-feed spiral antenna and the feed probe in the subsequent development of a plurality of models and pre-research subjects.

Drawings

FIG. 1 is a schematic diagram of a side-fed helical antenna connected to a feed probe;

FIG. 2 is a schematic diagram of a side-fed helical antenna before being welded to a feed probe;

fig. 3 is a schematic diagram of a side-fed helical antenna welded to a feed probe.

Detailed Description

The invention is further illustrated by the following examples.

As shown in FIG. 1, a connection mode of a satellite-borne spiral unit feed probe structure and a satellite-borne side-fed spiral antenna is designed, wherein the side-fed spiral antenna 1 is designed, a feed column 2 is designed, a feed rod 3 is designed, a reflection cup 4 is designed, a reflection plate 5 is designed, and a feed network 6 and a dielectric support 7 are designed. The invention is different from the traditional lap welding mode and the crimping mode of the spiral line and the feed probe, and adopts the welding mode of embedding the cylindrical spiral line into the U-shaped groove feed probe, as shown in figure 1. The feeding probe and the inner conductor of the feeding network are connected by threads, and the randomness of the initial angle of the feeding probe in the thread processing causes the problem that the direction of a U-shaped groove is inconsistent with the direction of a spiral line after the feeding probe is arranged in the feeding network by fixed torque. In order to avoid the problems, the feed probe is divided into the feed pole and the feed column, the upper end of the feed column is provided with a U-shaped groove, the feed column can be installed at any angle around the axis of the feed pole, and meanwhile, the relative positions of the spiral line, the feed column and the feed pole are fixed. The feeding column inner cavity adopts V-shaped design, the top end of the feeding rod adopts thread design, the welding area is increased, the welding strength is increased, and the shape of the welding part is regular. The welding position is located in the V-shaped inner cavity of the feed column, the shape of the welding position is regular, the problem that impedance is inconsistent due to the difference of the welding position when a plurality of spiral antenna arrays are arranged is solved, and the reliability of the welding position is obviously higher than that of a traditional connection mode. The connection mode of the side-fed helical antenna and the feed probe has the characteristics of simple structure, convenience in welding, good consistency of welding state and high reliability. The lower end of the feed column is additionally provided with an observation hole and an exhaust port, so that the welding state and the exhaust are conveniently observed.

A method for connecting a satellite-borne side-fed helical antenna with a feed probe comprises the following steps:

(2) fixing the helical antenna by installing the above components, installing the feed column by positioning the top end column of the feed rod, adjusting the U-shaped groove direction of the feed column to be consistent with the helical line direction, embedding the helical line into the U-shaped groove, and making the end of the helical line tangent to the feed column, as shown in FIG. 2

(3) And welding the feeding column V-shaped groove, observing the condition of the welding flux through the observation hole in the welding process to judge the welding state, wherein the welding position is shown in figure 3 after the welding is finished.

The probe is connected with the spiral array antenna according to the mode so as to improve the symmetry of an amplitude directional diagram of the spiral array antenna, reduce the phase center fluctuation of the spiral array antenna and improve the working efficiency of the antenna.

The invention has not been described in detail in part in the common general knowledge of a person skilled in the art.

Claims

1. a multi-degree-of-freedom amplitude consistent space-borne helical array antenna feeding probe is characterized in that: comprising a feeding rod and a feeding column; the upper end face of the feeding column is provided with a U-shaped groove, and the groove width is the same as that of the feeding rod. The chord height of the part embedded in the helix is the same, the groove depth is the same as the diameter of the helix, the included angle in the center is 15゜±1゜ V-shaped inner cavity, and the bottom is provided with a cylindrical groove and the feeder rod boss to locate and adjust the direction of the U-shaped groove; The feeder rod is installed into the inner conductor of the feeder network to be fixed, and the feeder rod is positioned into the V-shaped inner cavity using the cylindrical groove and the top cylinder of the feeder rod. The spiral wire is embedded in the U-shaped groove, so that the end of the spiral wire is tangent to the outer circle of the feeding column. During the welding process, the solder is filled into the V-shaped cavity of the feeding column until the V-shaped inner cavity is filled.

2. The probe according to claim 1, characterized in that: when welding the feeding rod, the feeding column and the helix, the welding point is located in the V-shaped groove inside the feeding column, the shape of the welding point is regular, and the state of the plurality of welding points is Consistent.

3 . The probe according to claim 1 , wherein the top of the feed rod is designed with a thread. 4 .

4 . The probe according to claim 1 , wherein the lower end face of the feeding column is provided with an observation hole and an exhaust hole, which is convenient for observing the welding state and exhausting. 5 .

5. The probe according to claim 4, characterized in that: the diameter of the observation hole and exhaust hole is Φ0.6.

6. a connection method of the probe described in claim 1 and the space-borne side-fed helical antenna, is characterized in that the step is as follows:

(1) After the feeder network and the reflector cup are installed into the reflector, the feeder rod is threaded into the inner conductor of the feeder network to fix it, and the flat port on the upper end of the feeder rod is used to apply a fixing torque;

(2) Install the helical antenna into the above components and fix it. The feeding column is positioned and installed by using the cylinder at the top of the feeding rod. Adjust the direction of the U-shaped groove of the feeding column to be consistent with the direction of the helix, and insert the helix into the U-shaped groove. The head is tangent to the feed post;

(3) Welding fills the V-shaped groove of the feeding column. During the welding process, the welding state is judged by observing the solder condition through the observation hole, and the welding is completed.

7. A method for improving the working efficiency of a helical array antenna, characterized in that the probe according to claim 1 is connected with the space-borne side-fed helical antenna according to the connection mode of claim 6, to improve the amplitude direction of the helical array antenna The symmetry of the graph reduces the phase center fluctuation of the helical array antenna.