SIW parallel feed array antenna with low cross polarization

Abstract

The invention discloses a SIW parallel feed array antenna with low cross polarization. The SIW parallel feed array antenna comprises a dielectric substrate, a metal layer arranged on the upper surfaceof the dielectric substrate, a metal grounding plate arranged on the lower surface of the dielectric substrate, a feed source and metal columns. The metal layer comprises seven rectangular metal sheets, and the first rectangular metal sheet is arranged in the center of the dielectric substrate; the metal layer is connected with the metal grounding plate through the metal columns, and electromagnetic waves are bound in the dielectric substrate; and the feed source is arranged in the center of the metal layer and penetrates through the metal grounding plate and the metal layer and feeds the metal layer. -35dB cross polarization level and 13.7 dB high gain can be realized.

Description

technical field [0001] The invention belongs to antenna technology, in particular to a low cross-polarized SIW parallel-fed array antenna. Background technique [0002] In modern microwave technology, microstrip antenna is the most widely used planar antenna. The microstrip antenna consists of three layers, the ground plane at the bottom, the dielectric substrate in the middle, and the metal sheet with a specific shape on the upper layer. The grounding plate and the surface metal sheet form a resonant cavity, which accumulates a large amount of electromagnetic energy in the cavity, and radiates the energy in the cavity to the outside through the gap between the conductive sheet and the grounding plate. [0003] The microstrip array antenna is to arrange and combine a certain number of the same microstrip antennas in a certain way to form a new antenna system. Professor Yang Han's team designed a four-element microstrip array antenna. Through array structure design and impe...

AI Technical Summary

Problems solved by technology

However, the microstrip array antenna has certain technical problems: when using the microstrip line for feeding, it will lose part of its energy and have radiation

The energy loss on the microstrip line will reduce the gain of the array antenna, and the radiation of the microstrip line will distort the radiation pattern of the entire array antenna, resulting in deterioration of radiation performance and poor cross-polarization level

In addition, when the microstrip line is used as the feed network, impedance matching is a difficult problem

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