Air-Coupled Low-Profile Circularly Polarized Dielectric Lens Antenna

Abstract

The invention discloses an air-coupled low-profile circularly-polarized dielectric lens antenna. The air-coupled low-profile circularly-polarized dielectric lens antenna is composed of three layers of dielectric plates, a square metal layer is arranged on the upper surface of the dielectric plate on the top layer, and a periodic rhombus gap is further formed in the square metal layer; a metal patch in the shape of an equilateral triangle is arranged on the lower surface of the dielectric plate on the middle layer, and the center of the metal patch is overlapped with the center of the dielectric plate on the middle layer; a microstrip line for feeding extending to the center along one side of the dielectric plate on the bottom layer is arranged on the lower surface of the dielectric plate on the bottom layer; the upper surface of the dielectric plate on the bottom layer is covered with a metal layer as an earth plate, and a cross-shaped gap is formed in the central position of the earth plate. According to the air-coupled low-profile circularly-polarized dielectric lens antenna, the impedance bandwidth, gain bandwidth and circular polarization bandwidth of the dielectric lens antenna are greatly improved. Moreover, through the design of a partial reflection surface, the reflection phase of the partial reflection surface in an antenna working frequency band is reduced, so that the height of the antenna is reduced, and low profile of the antenna is realized.

Description

technical field [0001] The invention relates to an air-coupled low-profile circularly polarized dielectric lens antenna, which belongs to the field of microwave technology. Background technique [0002] With the rapid development of modern wireless communication technology, the requirements for miniaturized and planar antennas are getting higher and higher, and the requirements for their gain are also getting higher and higher. In many cases, it is also necessary for the antenna to be able to generate circularly polarized waves to cope with different weather conditions. Therefore, a method of increasing the gain of the antenna by adding a part of the radiation surface in the radiation direction of the antenna is proposed. [0003] There are two problems in the design of traditional dielectric lens antennas: [0004] 1. The traditional circularly polarized lens antenna has relatively narrow impedance bandwidth and circularly polarized bandwidth, and can only work in a small...

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Problems solved by technology

[0004] 1. The traditional circularly polarized lens antenna has relatively narrow impedance bandwidth and circularly polarized bandwidth, and can only work in a small frequency band;

[0005] 2. The partial reflection surface of the traditional circularly polarized lens antenna has a higher reflection phase in the antenna working frequency band, which makes the antenna profile height higher

And because the magnitude and phase of the reflection coefficient of the partially reflective surface vary greatly with frequency, the 3dB gain bandwidth of the antenna is limited

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