Broadband double circularly polarized end-fire array antenna based on gap waveguide

Abstract

A broadband double circularly polarized end-fire array antenna based on a gap waveguide comprises an upper metal cover plate layer, a gap waveguide layer and a lower metal cover plate layer which aresuccessively stacked from top to bottom, wherein the gap waveguide layer is combined with the upper metal cover plate layer to form a upper gap waveguide structure, and is combined with the lower metal cover plate layer to form a lower gap waveguide structure; the upper and lower gap waveguide structure are fed through a first input port and a second input port respectively; the gap waveguide layer includes a metal separating plate, and metal ridges and a plurality of metal pins which are arranged on the front and back sides of the separating plate; each metal ridge includes a ridge gap waveguide T-type power divider and a three-stage stepped transition section transitioning from the ridge gap waveguide to a slot gap waveguide; the terminal of the metal separating plate is set as a separating plate circular polarizer; an antenna radiation structure is composed of a plurality of separating plate circular polarizers arranged in a matrix. The broadband double circularly polarized end-on-fire array antenna satisfies the characteristics of a wide frequency band, easy integration, and different circular polarization directions.

Description

technical field [0001] The invention belongs to the field of antenna structure design, and relates to a wide-band dual circularly polarized end-fire array antenna based on a gap waveguide. Background technique [0002] According to the polarization characteristics, the antenna can be divided into three types: linear polarization, circular polarization and elliptical polarization. Within the frequency range that can meet the design index requirements, the bandwidth is the main performance parameter of the antenna, such as input impedance, pattern, gain, Main lobe width and side lobe level, etc. In general, antenna performance parameters vary with frequency, so the antenna bandwidth depends on the frequency characteristics of each performance parameter. For circularly polarized antennas, their polarization characteristics are often the main factor limiting the operating bandwidth. Circularly polarized antennas can receive linearly polarized waves in any polarization direction...

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Problems solved by technology

[0003] In recent years, end-fired circularly polarized antennas are mostly implemented with symmetrical tapered slot structures. Although low profile and low loss can be achieved at the same time, the structure is still too complicated and not easy to process; substrate integrated waveguides are widely used in low profile In the feeding network, but it will bring a lot of loss in the millimeter wave frequency band; the gap waveguide structure is a new type of waveguide structure, and there are not many examples of being applied to end-fire antennas, so how to combine the gap waveguide technology Developing a wide-band, low-loss, and easy-to-integrate end-fire antenna is a problem that needs to be solved urgently. At the same time, it is also a difficult problem to realize dual circular polarization in a wide frequency band.

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