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CN-122026130-A - Array antenna

CN122026130ACN 122026130 ACN122026130 ACN 122026130ACN-122026130-A

Abstract

The application discloses an array antenna which comprises a radiation layer, a cavity layer and a feed layer, wherein a plurality of radiation gaps are formed in the radiation layer, the cavity layer is arranged below the radiation layer and comprises at least one coupling gap, the feed layer is arranged below the cavity layer, the feed layer is provided with a feed network, and the feed network comprises at least one ridge gap waveguide. By implementing the array antenna, the high-order mode resonant cavity can provide higher flexibility, a more compact structure and lower loss by adopting the gap waveguide transmission line with low loss and no electric contact characteristic as the feed network of the antenna, the top layer is a radiation slot of a loaded rectangular groove, the design of the groove can reduce the loss of energy and the leakage of non-radiation energy at the slot, and the performance improvement of high gain, low loss and wide frequency band of the miniaturized planar millimeter wave array antenna is realized.

Inventors

  • NIE PENGSHENG
  • YANG CHUNHUI
  • LI XIANG
  • ZHANG CONGHUI

Assignees

  • 深圳光启尖端技术有限责任公司

Dates

Publication Date
20260512
Application Date
20260313

Claims (12)

  1. 1. An array antenna, comprising: a radiation layer (100), wherein a plurality of radiation slits (101) are formed on the radiation layer (100); -a cavity layer (200), the cavity layer (200) being arranged below the radiation layer (100), the cavity layer (200) comprising at least one coupling slit (201); -a feed layer (300), the feed layer (300) being arranged below the cavity layer (200), a feed network being arranged on the feed layer (300), the feed network comprising at least one ridge gap waveguide (3011).
  2. 2. The array antenna according to claim 1, characterized in that an air gap is provided between the radiating layer (100) and the cavity layer (200), and an air gap is provided between the feeding layer (300) and the cavity layer (200).
  3. 3. The array antenna of claim 1, wherein the feed network comprises a centrally located transition structure (301), the transition structure (301) comprising the ridge gap waveguide (3011) of at least one ladder structure.
  4. 4. An array antenna according to claim 3, characterized in that the transition structure (301) is connected to two oppositely arranged first rectangular waveguides (302), the first rectangular waveguides (302) are further connected to the input ends of the first power divider (303), the two output ends of the first power divider (303) are respectively connected to the second rectangular waveguides (304), the second rectangular waveguides (304) are further connected to the input ends of the second power divider (305), and the two output ends of the second power divider (305) are respectively connected to the input ends of the third power divider (306) and the fourth power divider (307).
  5. 5. The array antenna of claim 4, wherein the first power divider (303) is an equal power divider.
  6. 6. The array antenna of claim 4, wherein the second power divider (305) is an unequal power divider.
  7. 7. The array antenna of claim 4, wherein the third power divider (306) is an unequal power divider.
  8. 8. The array antenna of claim 4, wherein the fourth power divider (307) is an unequal power divider.
  9. 9. An array antenna according to claim 3, characterized in that the feed layer (300) is provided with a plurality of first pins surrounding the feed network, the plurality of first pins forming an electromagnetic bandgap structure.
  10. 10. The array antenna according to claim 1, wherein a plurality of second pins surrounding the coupling slot (201) are provided on the cavity layer (200), and wherein a plurality of the second pins form an electromagnetic bandgap structure.
  11. 11. An array antenna according to claim 1, characterized in that the spacing between adjacent radiating slots (101) is smaller than one free space wavelength.
  12. 12. The array antenna of claim 1, wherein a flange is provided at the bottom of the feed layer (300).

Description

Array antenna Technical Field The application relates to an antenna technology, in particular to a low-sidelobe all-metal ridge gap waveguide array antenna. Background The performance of an antenna, which is a key component for implementing electromagnetic wave radiation and reception in a wireless communication system, directly affects the performance of the entire communication system. In order to meet the communication demands of larger capacity and higher speed, the antenna is required to have the characteristic of high gain so as to realize more efficient data transmission, and in a high frequency band, the antenna performance is limited by the high loss characteristic in the frequency band, so that the gain and the efficiency of the antenna are greatly reduced. Thus, millimeter wave antennas require antennas with key performance characteristics such as high gain, low loss, etc. Meanwhile, in order to optimize the system design, promote the miniaturization of the system and the effective reduction of the cost, reduce the loss of a feed network, and further need the characteristics of small size, easy conformal and low profile of the antenna. The current array antenna feed network can generally adopt a microstrip, a waveguide and a substrate integrated waveguide, wherein the microstrip feed network is easy to integrate, but the microstrip line has high-frequency loss and low power capacity, the rectangular waveguide has the lowest transmission loss, high performance and high power capacity, but the waveguide has large size, difficult integration and high cost, and the substrate integrated waveguide has low loss, is easier to process and integrate than the waveguide, but still has higher dielectric loss and narrower bandwidth at high frequency. That is, the array antenna in the prior art has the disadvantages of large high-frequency loss, large size, narrow bandwidth and the like. Disclosure of Invention Aiming at the defects of large high-frequency loss, large size, narrow bandwidth and the like of the array antenna in the prior art, the invention provides a low-side-lobe all-metal ridge gap waveguide array antenna so as to overcome the problems in the prior art. The scheme for solving the problems is as follows, the low-side-lobe all-metal ridge gap waveguide array antenna comprises: the radiation layer is provided with a plurality of radiation gaps; The cavity layer is arranged below the radiation layer and comprises at least one coupling gap; And the feed layer is arranged below the cavity layer, and a feed network is arranged on the feed layer and comprises at least one ridge gap waveguide. Preferably, an air gap is arranged between the radiation layer and the cavity layer, and an air gap is arranged between the feed layer and the cavity layer. Preferably, the feed network comprises a centrally located transition structure comprising at least one ridge gap waveguide of a stepped structure. Preferably, the feed network comprises a transition structure, the transition structure is connected with two first rectangular waveguides which are oppositely arranged, the first rectangular waveguides are further connected with the input ends of the first power divider, two paths of output ends of the first power divider are respectively connected with the second rectangular waveguides, the second rectangular waveguides are further connected with the input ends of the second power divider, and two paths of output ends of the second power divider are respectively connected with the input ends of the third power divider and the fourth power divider. Preferably, the first power divider is an equal power divider. Preferably, the second power divider is an unequal power divider. Preferably, the third power divider is an unequal power divider. Preferably, the fourth power divider is an unequal power divider. Preferably, the feed layer is provided with a plurality of first pins surrounding the feed network, and the plurality of first pins form an electromagnetic band gap structure. Preferably, a plurality of second pins of weak coupling gaps are arranged on the cavity layer, and the second pins form an electromagnetic band gap structure. Preferably, the radiation slit has a distance smaller than a free space wavelength. Preferably, the bottom of the feed layer is provided with a flange. By implementing the array antenna, the high-order mode resonant cavity can provide higher flexibility, a more compact structure and lower loss by adopting the gap waveguide transmission line with low loss and no electric contact characteristic as the feed network of the antenna, the top layer is a radiation slot of a loaded rectangular groove, the design of the groove can reduce the loss of energy and the leakage of non-radiation energy at the slot, and the performance improvement of high gain, low loss and wide frequency band of the miniaturized planar millimeter wave array antenna is realized. Drawings The accompanying drawings, which