CN-116565550-B - Slow wave line coplanar frequency scanning antenna array

Abstract

The invention relates to a slow wave line coplanar frequency scanning antenna array, belongs to the technical field of frequency scanning antennas, and solves the problem that the slow wave line and a radiation unit of an intermediate frequency scanning antenna in the prior art are independently designed to occupy a large space. The slow wave line coplanar frequency scanning antenna array comprises a plurality of coplanar frequency scanning units of a linear array, wherein each coplanar frequency scanning unit comprises a plurality of continuous radiating units, and each radiating unit comprises a rectangular waveguide, a radiating slot, a tuning table and a radiating cavity. And an omega-shaped slow wave line is arranged among the plurality of radiating units. The invention realizes miniaturization and low profile of the frequency scanning antenna by arranging the waveguide coplanar omega-shaped slow wave line.

Inventors

• WU WEI
• YANG LONG

Assignees

• 北京华航无线电测量研究所

Dates

Publication Date

20260505

Application Date

20220129

Claims (3)

1. 1. A slow wave line coplanar frequency sweep antenna array, characterized in that the slow wave line coplanar frequency sweep antenna array comprises a plurality of coplanar frequency sweep units (1) of linear arrays; The coplanar frequency scanning unit (1) comprises a plurality of continuous radiation units (11), a plurality of omega-shaped slow wave lines (4) are arranged between the radiation units (11), the slow wave lines (4) and a rectangular waveguide are integrally formed and protrude out of the upper surface of the rectangular waveguide, the slow wave lines (4) are provided with a plurality of omega-shaped bends, one radiation unit (11) is arranged on each slow wave line (4) at intervals, the omega-shaped bends comprise a first straight line part (41), two second straight line parts (42), four arc-shaped parts (43) and two U-shaped parts (44), the two second straight line parts (42) are symmetrically and alternately arranged, the two U-shaped parts (44) are symmetrically and alternately arranged, the first straight line parts (41) and the U-shaped parts (44) are vertically arranged in parallel, the second straight line parts (42) are perpendicular to the U-shaped parts (44), the two ends of the first straight line parts (41) are connected with the two arc-shaped parts (42) through the two arc-shaped radiation units (43), and the two arc-shaped radiation units (2) are connected with the two arc-shaped parts (42) through the two arc-shaped radiation units (43), the antenna comprises a tuning table (3) and a radiation cavity (5), wherein the radiation gap (2) is a rectangular gap arranged on a rectangular waveguide, the radiation cavities (5) are arranged at two ends of the radiation gap (2), the tuning table (3) is arranged at two sides of the radiation gap (2), the tuning table (3) is a rectangular metal entity, and the radiation cavity (5) is an annular metal shell.
2. 2. The slow wave line coplanar frequency sweep antenna array according to claim 1, wherein a plurality of the radiation slots (2) are arranged at equal intervals on the rectangular waveguide of the coplanar frequency sweep unit (1).
3. 3. The slow wave line coplanar frequency sweep antenna array according to claim 2, wherein the depth of the tuning stage (3) into the rectangular waveguide is greater than the depth of the radiation slot (2) into the rectangular waveguide.

Description

Slow wave line coplanar frequency scanning antenna array Technical Field The invention relates to the technical field of frequency scanning antennas, in particular to a slow wave line coplanar frequency scanning antenna array. Background The beam pointing of a frequency scanning antenna, abbreviated as a frequency scanning antenna, is changed with the frequency of the transmitter, so that the beam pointing is a function of frequency. For a frequency-swept radar, a beam is formed in space for each frequency antenna, and the direction of the target can be guided according to the frequency of the received echo signal. The implementation method of the frequency scanning antenna is divided into a waveguide and a microstrip. Microstrip is difficult to realize high-efficiency radiation of antenna due to large transmission loss. The waveguide can obtain higher radiation efficiency under the condition of good matching due to the closed transmission characteristic. The frequency scanning antenna comprises a general radiation array surface and a slow wave line. The slow wave line is a feed system of the frequency scanning antenna, provides electromagnetic waves with proper amplitude and phase requirements for the antenna linear array, and when the frequency changes, the equiphase surface of the line source is shifted, so that the alternating beam direction is changed, and the beam space scanning is realized. The fundamental structural form of slow wave lines is various. The coaxial snake line is mainly used for low frequency and high frequency, and is mainly composed of 1) a snake line which can be made of coaxial lines or rectangular waveguides, 2) a spiral line which is usually composed of rectangular waveguides, 3) a medium with high dielectric constant filled in the rectangular waveguides, 4) fold waveguides and the like. The frequency scanning slow wave line applied to the radar system must be capable of bearing high power and low in loss, and the most application of the frequency scanning slow wave line is a meandering rectangular waveguide slow wave line at present. The slow wave line is generally designed independently, occupies a larger space size, is configured with the radiation array surface in a T-shaped or L-shaped mode, or is connected with the radiation array surface by adopting a 90-degree bent waveguide, and is configured in parallel and coplanar mode, so that the whole mouth surface is enlarged and the occupied space is larger although the low profile can be realized. Disclosure of Invention In view of the above analysis, the present invention aims to provide a slow-wave line coplanar frequency-scanning antenna array, which is used for solving the problem that the slow-wave line and the radiating element of the existing frequency-scanning antenna are independently designed to occupy a large space. The aim of the invention is mainly realized by the following technical scheme: A slow wave line co-planar frequency sweep antenna array comprising a plurality of linear arrays of co-planar frequency sweep units; the coplanar frequency scanning unit comprises a plurality of continuous radiating units, and an omega-shaped slow wave line is arranged among the radiating units. Further, the radiating unit comprises a rectangular waveguide, a radiating slot, a tuning table and a radiating cavity. Further, the radiation slit is a rectangular slit arranged on the rectangular waveguide. Further, two ends of the radiation slit are provided with radiation cavities. Further, tuning tables are arranged on two sides of the radiation gap. Further, the tuning table is a rectangular metal entity. Further, the radiation cavity is an annular metal shell. Further, the slow wave line and the rectangular waveguide are integrally formed and protrude out of the upper surface of the rectangular waveguide. Further, a plurality of radiation slits are arranged on the rectangular waveguide of the coplanar frequency scanning unit at equal intervals. Further, the depth of the tuning table into the rectangular waveguide is greater than the depth of the radiation slit into the rectangular waveguide. The invention belongs to the technical field of frequency-scanning antennas, in particular to a method for realizing the frequency-scanning antenna, which comprises the steps of forming a coplanar frequency-scanning unit linear array by a plurality of radiation units, the slow wave line coplanar frequency scanning antenna array is formed, and the miniaturization, the low profile and the low cost of the frequency scanning antenna can be realized. The technical scheme of the invention can at least realize one of the following effects: 1. Miniaturization. The slow wave line coplanar frequency scanning antenna array disclosed by the invention is characterized in that the slow wave line 4 is processed into an omega-shaped bent curve shape, and the length of the slow wave line 4 is prolonged to the greatest extent on the premise that the distance be