CN-224232930-U - Low grating lobe opening waveguide antenna

Abstract

The utility model discloses a low grating lobe opening waveguide antenna in the field of antennas, which comprises a waveguide shell, a distributing piece, a suppressing piece and a suppressing piece, wherein the whole waveguide shell is in a horn mouth shape, a small-caliber end is an input port, a large-caliber end is an output port, at least three stages of matching steps are separated in the waveguide shell, the distributing piece is fixedly arranged at the output port of the waveguide shell, the suppressing piece is arranged on the matching steps close to the output port of the waveguide shell and is connected with the distributing piece, the suppressing piece is in a plate-shaped structure, and the extending direction of the suppressing piece is the E-plane direction of the waveguide shell.

Inventors

• LI XIANGQIANG
• QIN SHENG
• LI GUOLIN
• HAO WEI
• ZHANG JIANKONG
• WANG QINGFENG

Assignees

• 西南交通大学

Dates

Publication Date

20260512

Application Date

20250717

Claims (5)

1. 1. A low grating lobe open waveguide antenna comprising: The waveguide shell (1) is integrally horn-shaped, the small-caliber end is an input port (11), the large-caliber end is an output port (12), and at least three stages of matching steps are separated in the waveguide shell (1); A distribution member (2) fixedly arranged at an output port (12) of the waveguide housing (1) and used for dividing the output port (12) of the waveguide housing (1) into a plurality of independent open waveguide radiation units; And the suppressing piece (3) is arranged on the matching ladder close to the output port (12) of the waveguide shell (1) and is connected with the distributing piece (2), and the suppressing piece (3) is of a plate-shaped structure and extends in the E-plane direction of the waveguide shell (1).
2. 2. The low grating lobe open waveguide antenna according to claim 1, characterized in that the interior of the waveguide housing (1) comprises a first matching step (13), a second matching step (14) and a third matching step (15) in order from the input port (11) to the output port (12).
3. 3. The low grating lobe opening waveguide antenna according to claim 2, wherein the distributing member (2) is cross-shaped and comprises two cross-shaped grating bars, four ends of the two grating bars are fixedly connected with the inner wall of the output port (12) of the waveguide housing (1) respectively, arc protrusions (21) are arranged on the left side wall and the right side wall of the vertical grating bars, and the arc protrusions (21) are symmetrically arranged about the intersection point of the two grating bars.
4. 4. The low-grating-lobe open waveguide antenna according to claim 2, characterized in that the suppressing member (3) comprises two suppressing metal blocks, two of which are oppositely arranged at two ends of a grating with arc protrusions (21), and the bottom is fixedly arranged on the third matching step (15), and the top of the suppressing metal block is fixedly connected with the bottom of the two ends of the grating with arc protrusions (21).
5. 5. The low grating lobe open waveguide antenna of claim 2, wherein the sidewall corners of the first (13), second (14) and third (15) matching steps are rounded.

Description

Low grating lobe opening waveguide antenna Technical Field The utility model relates to the field of antennas, in particular to a low grating lobe open waveguide antenna. Background The performance of a high-power microwave antenna, which is an important component of a high-power microwave radiation system, is directly related to whether the energy of the whole system can effectively act on a target. Current high power microwave technology focuses on achieving higher efficiency, smaller volume, and higher peak power, while conventional high power antennas such as mode-switching antennas, COBRA antennas, parabolic reflector antennas, etc. have difficulty achieving the above requirements. The open waveguide panel antenna has the characteristics of low section, high caliber efficiency, large power capacity, easiness in processing and the like, can meet the requirements of various limited space scenes, and is widely paid attention to and researched in recent years. The existing open waveguide research is that a metal plugboard with the same height as the radiation port surface is loaded on the radiation port surface, so that the radiation structure can be approximately divided into two small-caliber units, the uniformity of the electric field of the port surface is improved, and the gain and caliber efficiency are improved. If the small-caliber radiating unit is excited by the power division network, the primary power fraction can be reduced, but the method is still inapplicable to limited space scenes, is unfavorable for the miniaturization of the system, and needs to further reduce the number of stages of the power division network. To this end we propose a low grating lobe open waveguide antenna. Disclosure of Invention In view of the above-mentioned shortcomings of the prior art, the present utility model provides a low grating lobe open waveguide antenna. In order to achieve the aim of the utility model, the utility model adopts the following technical scheme: A low grating lobe opening waveguide antenna comprises a waveguide shell, a distributing piece and a suppressing piece, wherein the whole waveguide shell is in a horn mouth shape, a small-caliber end is an input port, a large-caliber end is an output port, at least three stages of matching steps are separated in the waveguide shell, the distributing piece is fixedly arranged at the output port of the waveguide shell and used for separating the output port of the waveguide shell into a plurality of independent opening waveguide radiation units, the suppressing piece is arranged on the matching steps close to the output port of the waveguide shell and connected with the distributing piece, the suppressing piece is of a plate-shaped structure, and the extending direction of the suppressing piece is the E surface direction of the waveguide shell. The three-stage matching ladder is arranged for impedance matching, the structure is simple, the section is lower, compared with the two-stage matching ladder, the impedance matching effect is better, the output port of the waveguide shell is divided into a plurality of independent waveguide radiating units for radiation by arranging the distribution part at the output port of the waveguide shell, the system weight and the section height are reduced, the volume of the antenna is reduced, the utility model is used as the waveguide array antenna through the array, the number of stages of the power division network of the waveguide array antenna can be reduced, the diffraction of the edge of the port surface can be reduced by arranging the suppression part along the E surface direction of the waveguide shell, and the grating lobe level of the array antenna after the array antenna is formed by the array as the unit is reduced. Further defined, the interior of the waveguide housing includes a first mating step, a second mating step, and a third mating step in sequence from the input port to the output port. Further limited, the distributing piece is cross-shaped and comprises two cross-shaped grid bars, four ends of the two grid bars are fixedly connected with the inner wall of the output port of the waveguide shell respectively, arc protrusions are arranged on the left side wall and the right side wall of the vertical grid bar, and the arc protrusions are symmetrically arranged about the intersection point of the two grid bars. The distribution piece is arranged in a cross shape, a one-to-four power distribution network of an output port can be realized, the radiation unit is divided into independent small-port surface units, the equal-amplitude in-phase radiation of the four opening waveguide units is realized, the simplification of the power distribution network is facilitated, the caliber efficiency is improved, the arc protrusions are arranged on the vertical grid bars, the electric field of each independent small-opening waveguide radiation unit is facilitated to be homogenized by matching with the suppression