A High Isolation Array Antenna Based on Electromagnetic Absorber

Abstract

The invention discloses an electromagnetic wave absorbing body-based high-isolation array antenna, which comprises a metal bottom plate, wherein four element antennas are vertically arranged on the metal bottom plate, are symmetrically distributed relative to the center of the metal bottom plate and rotate 90 degrees in sequence; an electromagnetic wave absorbing body unit formed by electromagnetic wave absorbing walls is arranged on two vertical axes of the metal bottom plate; each electromagnetic wave absorbing wall is of a double-sided structure and comprises two layers of electromagnetic wave absorbing plates which are laminated back to back; a plurality of evenly spaced microstrip structures are arranged at the front side of each electromagnetic wave absorbing plate; and each microstrip structure comprises a cross-shaped microstrip patch and square annular microstrip lines arranged at the outer side of the cross-shaped microstrip patch. The antenna is applied to a Beidou satellitenavigation system; and spatial electromagnetic waves, close to a factory, of the element antennas are absorbed through the electromagnetic wave absorbing body unit, so that coupling of the spatial waves between the element antennas is reduced and the isolation between the element antennas is improved.

Description

technical field [0001] The invention belongs to the technical field of antennas, and also relates to the technical field of electromagnetic superconductors; in particular, it relates to a high-isolation array antenna based on an electromagnetic absorber. Background technique [0002] The satellite navigation system is an important information source in the field of modern military weapons and equipment and combat command. It can provide accurate three-dimensional position and speed information and high-precision time reference for various military carriers on land, sea, air and space around the world. However, the power of satellite navigation signals received on the ground is quite weak, and satellite navigation receivers are extremely susceptible to interference from unintentional or artificial radio frequency signals, resulting in reduced navigation accuracy, and in severe cases, even unable to capture satellite navigation signals. The satellite navigation adaptive anti-j...

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Problems solved by technology

However, there are relatively few research reports on the application of electromagnetic absorbers to improve the isolation of array antennas, especially the isolation of circularly polarized array antennas.

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