CN-122000695-A - Waveguide antenna structure with low profile and vertical polarization

Abstract

The invention provides a low-profile vertically polarized waveguide antenna structure, which comprises a waveguide antenna, wherein the waveguide antenna comprises a radiation cavity, radiation slits and waveguide feeder lines, wherein two ends of the radiation cavity are closed and short-circuited, the waveguide feeder lines extend away from the radiation cavity from the middle position of the radiation cavity so as to be arranged in a T-shaped mode with the radiation cavity, the waveguide feeder lines are short-circuited at the ends close to the radiation cavity, the number of the two radiation slits is two, the two radiation slits are positioned above the radiation cavity and are respectively arranged at the inner sides of the two ends of the radiation cavity, and the radiation slits are communicated with the radiation cavity and penetrate through the top plane of the antenna structure.

Inventors

• ZHANG YUPING
• GU JINJIE

Assignees

• 上海威浪达科技有限公司

Dates

Publication Date

20260508

Application Date

20260310

Claims (10)

1. 1. The waveguide antenna structure comprises a waveguide antenna, wherein the waveguide antenna comprises a radiation cavity, radiation slits and waveguide feeder lines, two ends of the radiation cavity are closed and short-circuited, the waveguide feeder lines extend away from the radiation cavity from a position in the middle of the radiation cavity so as to be arranged in a T-shaped mode with the radiation cavity, the waveguide feeder lines are short-circuited at the ends close to the radiation cavity, the number of the radiation slits is two, the two radiation slits are positioned above the radiation cavity and are respectively arranged on the inner sides of the two ends of the radiation cavity, and the radiation slits are communicated with the radiation cavity and penetrate through the top plane of the antenna structure.
2. 2. The waveguide antenna structure of claim 1, wherein the radiating cavity is flush with the waveguide feed top surface, the radiating cavity having a height that is half the waveguide feed height.
3. 3. The waveguide antenna structure of claim 1, wherein a matching body is provided below the radiating cavity, the matching body being in the form of a bevel structure.
4. 4. The waveguide antenna structure of claim 1, wherein an active divider is disposed between the radiating slots, the active divider extending into the radiating cavity and dividing the radiating cavity into two radiating areas.
5. 5. The waveguide antenna structure of claim 1, wherein the radiating cavity is an H-plane waveguide cavity and the waveguide feed line is an E-plane waveguide transmission line.
6. 6. The waveguide antenna structure of claim 1, wherein a beam confining structure is provided above the radiating slot, the beam confining structure resembling a horn or a stepped structure oriented in the radiating direction.
7. 7. The waveguide antenna structure of any of claims 1-6, wherein the ratio of the length of the long side to the width of the waveguide feed line is approximately 2:1 and meets the cutoff requirement of the TE10 mode at the operating frequency, and the ratio of the length of the long side to the width of the radiating cavity is approximately 2:1 and meets the cutoff requirement of the TE10 mode at the operating frequency.
8. 8. The waveguide antenna structure of any of claims 1-6, wherein the radiating slots are half the length of the operating wavelength and the radiating slots are spaced half the operating wavelength apart.
9. 9. The waveguide antenna structure of any of claims 1-6, wherein the waveguide antenna structure is fabricated from a metallic material or from a non-metallic material such as plastic and then surface metallized.
10. 10. The waveguide antenna structure of any one of claims 1-6, wherein the waveguide antenna structure comprises a plurality of waveguide antennas that are split in parallel in multiple stages through a common division network at an end of the waveguide feed line that connects the radiation cavity.

Description

Waveguide antenna structure with low profile and vertical polarization Technical Field The present invention relates to an antenna structure adapted to a low-altitude environment, and more particularly, to a low-profile vertically polarized waveguide antenna structure. Background The antenna structure for low-altitude environment in the prior art generally adopts a microstrip antenna, and the radiation efficiency is not high. Even if a waveguide antenna is adopted, accurate vertical polarization cannot be achieved due to layout reasons, so that the requirements of use of specific scenes, such as signal attenuation caused by ground reflection needs to be reduced for low-altitude aircrafts and the omnidirectional communication requirements of low-altitude environments, cannot be met. In addition, such antennas are typically relatively high profile and cannot meet small size placement requirements. Disclosure of Invention In view of the above problems, the invention provides a low-profile vertically polarized waveguide antenna structure, which comprises a waveguide antenna, wherein the waveguide antenna comprises a radiation cavity, radiation slots and waveguide feeder lines, both ends of the radiation cavity are closed and short-circuited, the waveguide feeder lines extend away from the radiation cavity from a position in the middle of the radiation cavity so as to be arranged in a T shape with the radiation cavity, the waveguide feeder lines are short-circuited at the ends close to the radiation cavity, the number of the radiation slots is two, the two radiation slots are positioned above the radiation cavity and are respectively arranged on the inner sides of the two ends of the radiation cavity, and the radiation slots are communicated with the radiation cavity and penetrate through the top plane of the antenna structure. According to one aspect of the invention, the radiating cavity is flush with the top surface of the waveguide feed line, and the height of the radiating cavity is half of the height of the waveguide feed line. According to one aspect of the invention, a matching body is arranged below the radiation cavity, and the matching body is in the form of an inclined plane structure. According to one aspect of the invention, a power divider is arranged between the radiation slits, which power divider extends into the radiation cavity and divides the radiation cavity into two radiation areas. According to one aspect of the invention, the radiating cavity is an H-plane waveguide cavity and the waveguide feed line is an E-plane waveguide transmission line. According to one aspect of the invention, a beam confining structure is arranged above the radiating slot, the beam confining structure resembling a horn or a stepped structure facing the radiating direction. According to one aspect of the invention, the length ratio of the long side to the wide side of the waveguide feeder is close to 2:1, and meets the cutoff requirement of the TE10 mode at the working frequency, and the length ratio of the long side to the wide side of the radiation cavity is close to 2:1, and meets the cutoff requirement of the TE10 mode at the working frequency. According to one aspect of the invention, the radiating slits have a length of one half the operating wavelength and are spaced apart by about one half the operating wavelength. According to one aspect of the invention, the waveguide antenna structure is made of a metal material or made of a non-metal material such as plastic, and then subjected to surface metallization. According to one aspect of the invention, the waveguide antenna structure comprises a plurality of waveguide antennas, and the waveguide antennas are formed by multilevel parallel branching through a public network at one end of the waveguide feeder line connected with the radiation cavity. Drawings Fig. 1 shows a top view of a vertically polarized wave guide antenna structure according to the present invention; fig. 2 shows a block diagram of a waveguide antenna in a vertically polarized waveguide antenna structure according to the present invention; FIG. 3 shows a cross-sectional view of a vertically polarized wave guide antenna structure according to the invention taken along section line A-A in FIG. 1; FIG. 4 shows a cross-sectional view of a vertically polarized wave guide antenna structure according to the invention taken along section line B-B in FIG. 1; fig. 5 shows a perspective view of a vertically polarized waveguide antenna structure according to the invention; fig. 6 shows a perspective view of an embodiment of a vertically polarized waveguide antenna structure with beam confining structure in accordance with the invention; Fig. 7 shows a perspective view of a 2-stage parallel 4-slot vertically polarized waveguide antenna structure design of a vertically polarized waveguide antenna structure according to the invention. Detailed Description The following description of specific embodiments o