CN112164884B - Satellite-borne helical array antenna feed probe with multiple degrees of freedom and consistent amplitude and phase - Google Patents

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 pole 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 cylindrical positioning device at the top end of the feed pole, the end part of the spiral line is tangent to the excircle of the feed column, and the V-shaped groove is filled with solder in the welding process.

Description

A Spaceborne Helical Array Antenna Feeding Probe with Multiple Degrees of Freedom and Amplitude Consistent

technical field

The invention relates to a space-borne spiral array antenna feeding probe with consistent multi-degree-of-freedom amplitudes, and belongs to the technical field of antenna structures.

Background technique

The helical array antenna is more sensitive to the amplitude and phase error of each helical unit in the beamforming design. If the traditional feeder is used to overlap the feeder probe, the positions of the helix and the feeder probe are random, and the shapes of the solder joints are inconsistent. The distribution is difficult to guarantee. Near-field amplitude and phase channel testing is required, and an additional compensation phase link is required. The debugging and testing cycle is very long and the efficiency is low.

Contents of the invention

The technical problem solved by the present invention is to overcome the deficiencies of the prior art, provide a space-borne spiral array antenna feeding probe with consistent multi-degree-of-freedom amplitudes, and improve product consistency, reliability and operability.

The technical solution of the present invention is: a space-borne spiral array antenna feeding probe with the same multi-degree-of-freedom amplitude, including a feeding rod and a feeding post; the upper end of the feeding post is provided with a U-shaped groove, and The width is the same as the chord height of the embedded helix, the groove depth is the same as the diameter of the helix, the center is set at an angle of 15°±1°V-shaped inner cavity, and the bottom is set with a cylindrical groove and a U-shaped groove for the positioning and adjustment of the feed rod boss Direction; the feeder rod is fixed in the conductor of the feeder network, and the feeder rod is positioned in the V-shaped inner cavity using a cylindrical groove and the top cylinder of the feeder rod, and the direction of the U-shaped groove is adjusted to be consistent with the direction of the helix , insert the helix into the U-shaped groove, so that the end of the helix is tangent to the outer circle of the feed post, and fill the solder into the V-shaped cavity of the feed post during the welding process until it fills the V-shaped cavity.

Preferably, when welding the feed rod, the feed column and the helix, the welding spot is located in the V-shaped groove inside the feed column, the shape of the welding spot is regular, and the states of the plurality of welding spots are consistent.

Preferably, the top end of the feed rod is threaded.

Preferably, the lower end surface of the feeder column is provided with an observation hole and an exhaust hole, which is convenient for observing the welding state and exhausting.

Preferably, the diameter of the observation hole and exhaust hole is Φ0.6.

A method for connecting the probe to the space-borne side-fed helical antenna, the steps are as follows:

(1) After the feed network and the reflector cup are loaded into the reflector, the feed rod is screwed into the inner conductor of the feed network and fixed, and the fixed torque is applied by using the flat opening on the upper end of the feed rod;

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

(3) Weld and fill the V-shaped groove of the feeder column. During the welding process, observe the solder through the observation hole to judge the welding state and complete the welding.

A method for improving the working efficiency of a helical array antenna. According to the above connection method, the probe is connected with the space-borne side-fed helical antenna, so as to improve the symmetry of the amplitude pattern of the helical array antenna and reduce the symmetry of the helical array antenna. Phase center fluctuations.

The beneficial effect of the present invention compared with prior art is:

The invention adopts the separate structure of the feed rod and the feed post and the design of the helical inlaid welding, which has good consistency of the welding parts, high welding strength, convenient welding, improves the consistency, reliability and operability of the welding parts, and greatly improves the The symmetry of the amplitude pattern of the helical array antenna is improved, the phase center fluctuation of the helical array antenna is reduced, and the working efficiency of the helical array antenna is improved.

This invention has been applied to many space-borne array antennas in my country, and has passed the mechanical, thermal shock, and thermal vacuum appraisal level assessment and in-orbit use. The connection mode between the side-fed helical antenna and the feeding probe has wide application fields and good market competitiveness.

Description of drawings

Fig. 1 Schematic diagram of connection between side-fed helical antenna and feeding probe;

Fig. 2 Schematic diagram of side-fed helical antenna and feeding probe before welding;

Fig. 3 The schematic diagram of side-fed helical antenna and feeding probe after welding.

detailed description

The present invention will be further elaborated below in conjunction with embodiment.

As shown in Figure 1, a connection method between a space-borne helical unit feeding probe structure and a space-borne side-fed helical antenna, design components side-fed helical antenna 1, feeding column 2, feeding rod 3, reflective cup 4, Reflector 5 , feed network 6 and dielectric support 7 . The present invention is different from the traditional overlapping welding method and crimping method of the spiral wire and the feeding probe, and adopts the welding method of the cylindrical helical wire embedded in the U-shaped groove feeding probe, as shown in FIG. 1 . In this connection method, the feeding probe and the inner conductor of the feeding network are connected by threads. Due to the randomness of the starting angle of the feeding probe in the thread processing, the feeding probe is installed into the feeding network with a fixed torque and U-shaped. The problem that the groove direction does not coincide with the direction of the helix. In order to avoid the above problems, the feeding probe is divided into a feeding rod and a feeding column. There is a U-shaped groove on the upper end of the feeding column. The relative positions of the electric post and the feeder pole are fixed. The inner cavity of the feed column adopts a V-shaped design, and the top of the feed rod is designed with threads, which increases the welding area, increases the welding strength, and the shape of the welding part is regular. The welding part is located in the V-shaped inner cavity of the feeding column, and the shape of the welding part is regular, which improves the problem of inconsistent impedance caused by the difference of the welding part when multiple helical antennas are arrayed, and the reliability of the welding part is significantly higher than that of the traditional connection method. The connection mode of the side-fed helical antenna and the feeding probe has the characteristics of simple structure, convenient welding, good consistency of welding state and high reliability. An observation hole and an exhaust port are added at the lower end of the feed column to facilitate observation of welding status and exhaust.

A connection method between a space-borne side-fed helical antenna and a feeding probe is as follows:

(1) After the feed network and the reflector cup are loaded into the reflector, the feed rod is screwed into the inner conductor of the feed network and fixed, and the fixed torque is applied by using the flat opening on the upper end of the feed rod;

(2) Install the helical antenna into the above parts and fix it. The feeder column is positioned by the cylinder at the top of the feeder rod. Adjust the direction of the U-shaped groove of the feeder column to be consistent with the direction of the helix. The head is tangent to the feed column, as shown in Figure 2

(3) Weld and fill the V-shaped groove of the feeder column. During the welding process, observe the solder through the observation hole to judge the welding state. After the welding is completed, the welding position is shown in Figure 3.

The probe is connected to the helical array antenna in the above manner, so as to improve the symmetry of the amplitude pattern of the helical array antenna, reduce the phase center fluctuation of the helical array antenna, and improve the working efficiency of the antenna.

Parts not described in detail in the present invention belong to the common knowledge of those skilled in the art.

Claims (7)

1. A space-borne spiral array antenna feed probe with multiple degrees of freedom amplitudes consistent, is characterized in that: it includes a feed rod and a feed post; the upper end of the feed post is provided with a U-shaped groove, and the groove width is the same as 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, and the center is set at an angle of 15゜±1゜V-shaped inner cavity, and a cylindrical groove is set at the bottom, which is used for positioning and adjusting the U-shape with the boss of the feeder rod Groove direction; the feeder rod is installed into the conductor of the feeder network to fix it, and the feeder rod is positioned into the V-shaped inner cavity using a cylindrical groove and a cylinder at the top of the feeder rod, and the direction of the U-shaped groove and the direction of the helix are adjusted. Consistently, insert the helix into the U-shaped groove so that the end of the helix is tangent to the outer circle of the feeder column. During the welding process, fill the solder into the V-shaped cavity of the feeder column until it is full of the V-shaped cavity. 2. The probe according to claim 1, characterized in that: when welding the feed rod, feed post and helix, the solder joints are located in the V-shaped groove inside the feed post, the solder joints have regular shapes, and the states of multiple solder joints unanimous. 3. The probe according to claim 1, characterized in that: the top end of the feed rod is threaded. 4. The probe according to claim 1, characterized in that: the lower end surface of the feed post is provided with an observation hole and an exhaust hole, which is convenient for observing the welding state and exhausting. 5. The probe according to claim 4, characterized in that the diameter of the observation hole and exhaust hole is Φ0.6. 6. a method for connecting probes and space-borne side-fed helical antennas according to claim 1, characterized in that the steps are as follows: (1) After the feed network and the reflector cup are loaded into the reflector, the feed rod is screwed into the inner conductor of the feed network to fix it, and the upper end of the feed rod is used to apply a fixed torque; (2) Put the helical antenna into the above-mentioned reflective cup and fix it. The feeder column is positioned by the cylinder at the top of the feeder rod. Adjust the direction of the U-shaped groove of the feeder column to be consistent with the direction of the helix. The end is tangent to the feeder column; (3) Weld and fill the V-shaped groove of the feeder column. During the welding process, observe the solder through the observation hole to judge the welding state and complete the welding. 7. A method for improving the working efficiency of the spiral array antenna is characterized in that the probe according to claim 1 is connected with the space-borne side-fed spiral antenna according to the connection method of claim 6, so as to improve the amplitude direction of the spiral array antenna The symmetry of the graph reduces the phase center fluctuation of the helical array antenna.

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