A Broadband Gap Waveguide Array Antenna

Abstract

The invention discloses a wide-band gap waveguide array antenna, which includes a radiation layer and a feeding layer. The radiation layer includes a radiation unit sub-array layer, a first gap waveguide coupling layer and a second gap waveguide coupling layer. The radiation unit sub-array layer includes The first plate and the radiation array arranged on the first plate, the radiation array is formed by 16 radiation units distributed in the form of 4 rows × 4 columns, each radiation unit includes the first rectangular cavity and the second stacked from top to bottom respectively. Two rectangular cavities, the first gap waveguide coupling layer has a first air cavity that divides energy into two paths, the second gap waveguide coupling layer has a second air cavity that divides energy into four paths, and the feed layer has a The energy is evenly divided into two channels, and the energy with the same amplitude and phase is sent to the third air cavity of the second gap waveguide coupling layer; the advantage is that it has high gain and efficiency on the basis of low side lobes, and the processing cost lower.

Description

technical field [0001] The present invention relates to an array antenna, in particular to a wide-band gap waveguide array antenna. Background technique [0002] On the electromagnetic spectrum, the low-frequency spectrum is already quite crowded, and it is more and more urgent to carry out research on related technologies in higher frequency bands, such as the millimeter wave band. The available frequency bandwidth and electromagnetic wavelength are short in the millimeter wave frequency band. There are many advantages in antenna design in this frequency band, such as: it is easy to achieve wider working bandwidth and miniaturized design. [0003] With the improvement of anti-jamming requirements for radar and the development of modern electronic industry, it is required that the antenna should have the performance of low side lobe or extremely low side lobe. The traditional array antenna mainly includes a feeding layer and a radiating layer. At present, there are mainly t...

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Problems solved by technology

The traditional array antenna mainly includes a feed layer and a radiation layer. At present, there are two main solutions to reduce its side lobes. The first solution is to adjust the energy distribution of the radiation layer by adjusting the power distribution ratio of the feed layer to reduce the side lobes. However, this solution will always cause the main lobe to widen and the gain will decrease while reducing the side lobes. It cannot guarantee a narrow main lobe and obtain extremely low side lobes without sacrificing the gain; the second solution is to add poles above the radiation layer Adding a polarization layer can reduce the sidelobe, and increasing the polarization layer can rotate the electric field polarization direction of the radiation layer, and can optimize the E-plane and H-plane patterns of the antenna to achieve low sidelobes, but increasing the polarization layer in mass production will Increase the cost of the antenna by 20%

[0004] However, in the millimeter wave frequency band, more serious sidewall wave effects, higher dielectric loss and other unfavorable factors also bring troubles to the traditional array antenna design

The usability of traditional waveguide transmission lines is greatly reduced, so there is a need to find waveguide transmission lines with good performance in the mmWave frequency band

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