CN219553883U

CN219553883U - Frequency scanning antenna based on waveguide transmission line feed

Info

Publication number: CN219553883U
Application number: CN202321032917.0U
Authority: CN
Inventors: 李铭琦; 张军杰; 耿东华
Original assignee: CETC 27 Research Institute
Current assignee: CETC 27 Research Institute
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2023-08-18
Anticipated expiration: 2033-05-04

Abstract

The utility model discloses a frequency scanning antenna based on waveguide transmission line feed, which comprises a first waveguide and a second waveguide which are arranged in parallel, wherein the transmission line of the first waveguide is in an interdigital shape, a boss is arranged on the transmission line, a transition structure of the first waveguide transmission line adopts arc transition, a waveguide coupling straight slit is arranged between the first waveguide and the second waveguide, the second waveguide comprises a short pavement and a radiation port, and the transition structure of the transmission line adopts arc transition, so that phase shift dispersion response of the transmission line at a turning structure is ensured to be consistent, and phase difference consistency of a radiation unit is ensured; the phase consistency of the energy received by each second waveguide is ensured by adjusting the distance between the short circuit surface of the second waveguide and the coupling straight slit of the waveguide and the size of the boss, so that frequency scanning is better realized, and finally, low-loss high-frequency transmission is realized.

Description

Frequency scanning antenna based on waveguide transmission line feed

Technical Field

The utility model belongs to the technical field of frequency scanning antennas, and particularly relates to a frequency scanning antenna based on waveguide transmission line feed.

Background

The frequency scanning antenna changes the pointing angle of the antenna by changing the excitation frequency of the antenna, thereby realizing the scanning of the beam at a lower cost. Although the cost of both passive and active phase shifters is now greatly reduced, the cost of making a two-dimensional phased array is relatively high, especially for small antennas.

The utility model patent with the publication number of CN 213304350U discloses a small-volume wide-angle coverage modular frequency scanning phased array antenna, which comprises a radiation antenna unit, a power division network unit and a slow wave line unit; the radiation antenna unit, the power division network unit and the slow wave line unit are connected by adopting a non-standard structure waveguide, and the whole radiation antenna unit, the power division network unit and the slow wave line unit are processed by adopting a multi-layer welding process; the arrangement cannot meet the requirement of consistency of dispersion response, a long feeder line is required for the frequency scanning antenna, and the loss of a high-frequency transmission line is large, so that the gain of the antenna is seriously affected, and the antenna cannot be used. The high frequency scanning antenna must select a low loss transmission line form and be able to provide the same coupling phase for the radiating element.

Disclosure of Invention

The utility model aims to provide a frequency scanning antenna based on waveguide transmission line feed, which is used for solving the problem of larger loss of a high-frequency transmission line in the prior art.

The technical scheme for solving the technical problems is as follows:

the utility model provides a frequency sweep antenna based on waveguide transmission line feed, includes parallel arrangement's first waveguide, second waveguide, the transmission line of first waveguide is the interdigital, be provided with the boss on the transmission line, first waveguide transmission line transition structure adopts circular-arc transition, first waveguide with be provided with waveguide coupling straight slit in the middle of the second waveguide, the second waveguide includes short road surface, radiation port.

The radiation port adopts a waveguide port radiation mode.

The radiation port adopts a small horn radiation mode.

The transmission line adopts a slow wave line structure.

The beneficial effects of the utility model are as follows:

the first waveguide and the second waveguide are arranged in parallel, the first waveguide is used for transmitting high-frequency electromagnetic waves, the second waveguide is used for externally radiating the high-frequency electromagnetic waves, the transition structure of the transmission line of the first waveguide adopts arc transition, and the phase shift dispersion response of the transmission line at the turning structure can be ensured to be consistent, so that the phase difference consistency of the radiating units is ensured; the phase consistency of the energy received by each second waveguide is ensured by adjusting the distance between the short circuit surface of the second waveguide and the coupling straight slit of the waveguide and the size of the boss, so that the frequency scanning effect is better realized, and finally, the low-loss high-frequency transmission is realized.

Drawings

FIG. 1 is a schematic cross-sectional view of a first layer of the present utility model;

FIG. 2 is a schematic cross-sectional view of the overall structure of the present utility model;

FIG. 3 is a schematic cross-sectional view of a third layer of the present utility model;

fig. 4 is a schematic diagram of a second waveguide radiation port structure.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1, the utility model comprises a first waveguide 5 and a second waveguide 6 which are arranged in parallel, wherein the transmission line of the first waveguide 5 is in an interdigital shape, a boss 4 is arranged on the transmission line, the first waveguide transmission line transition structure adopts an arc transition, the first waveguide transmission line is in an interdigital shape so as to meet the consistency requirement of the dispersion response of the transmission line, the transmission line transition structure of the first waveguide adopts an arc transition mode, the frequency band response of the mode transition is always better, the mode transition can be completely equivalent to the straight waveguide transmission, and the phase shift dispersion response of the transmission line at a turning structure is ensured to be consistent, thereby ensuring the phase difference consistency of radiation units.

As shown in fig. 2, the positional relationship between the first waveguide 5, the second waveguide 6, the waveguide coupling straight slit 3 and the boss 4 is described, the waveguide coupling straight slit 3 is disposed between the first waveguide and the second waveguide, the distance between the short-circuit surface and the waveguide coupling straight slit and the size of the boss are implemented by machining after the electrical design is completed, the width of the waveguide coupling straight slit needs to meet the requirement of placing in the waveguide after one-time machining forming, the length of the waveguide coupling straight slit is less than half of the wavelength of the free space, the coupling energy is determined by the distance of the straight slit deviating from the center line of the waveguide, but the coupling phases will differ in different frequencies, so that the parameters of the boss need to be adjusted to ensure the consistency of the coupling energy and the coupling phases in the frequency band, and the distance between the second waveguide short-circuit surface and the waveguide coupling straight slit and the size of the boss need to ensure the phase consistency of each second waveguide receiving energy.

The second waveguide, as shown in fig. 3 and 4, comprises a short road surface 2 and a radiation port 7, and radiation from the waveguide port can be adopted, or radiation from a small horn can be adopted.

The utility model can reduce loss by adopting a waveguide transmission mode, because the height of the waveguide does not influence the propagation constant of the waveguide, the waveguide with half height or even lower height is adopted, the waveguide is arranged in parallel and is divided into a first waveguide 5 and a second waveguide 6, the first waveguide is responsible for transmitting high-frequency electromagnetic waves, the second waveguide is responsible for radiating the high-frequency electromagnetic waves externally, and the number of the second waveguides is determined according to the requirement of beam width. The first waveguide and the second waveguide are coupled with straight seam coupling energy through the waveguides, a three-port network is formed locally, and the transmission line transition in the first waveguide adopts an arc transition mode, so that the frequency band response of the mode transition is good in all-time property, the mode transition can be completely equivalent to the straight waveguide transmission, and the beam frequency scanning is realized through the arrangement, and meanwhile, the low-loss high-frequency transmission is ensured.

Claims

1. A frequency scanning antenna based on waveguide transmission line feed is characterized in that: the novel high-efficiency high-power transmission device comprises a first waveguide and a second waveguide which are arranged in parallel, wherein a transmission line of the first waveguide is in an interdigital shape, a boss is arranged on the transmission line, a transition structure of the first waveguide adopts arc transition, a waveguide coupling straight slit is arranged between the first waveguide and the second waveguide, and the second waveguide comprises a short pavement and a radiation port.

2. The waveguide transmission line feed-based frequency scanning antenna as set forth in claim 1, wherein the radiation port adopts a waveguide port radiation mode.

3. The waveguide transmission line feed based frequency scanning antenna as set forth in claim 1, wherein the radiation port adopts a horn radiation pattern.

4. The waveguide transmission line feed-based frequency scanning antenna according to claim 1, wherein the transmission line adopts a slow wave line structure.