A Broadband High Gain Circularly Polarized Patch Quasi-Yagi Antenna

Abstract

The invention discloses a broadband high-gain circularly polarized patch quasi-yagi antenna, comprising a floor, a feed interface, a support column disposed in the middle of the floor, and a coaxial multi-stage antenna piece connected to the support column. The first-stage antenna piece of the coaxial multi-stage antenna piece is close to the floor, and is fixed to the floor by a connecting component. The remaining antenna pieces in respective stages are gradually away from the floor and are successively reduced. The feed interface is fixed to the floor. The inner core of the feed interface passes through the floor and is connected to a stage of antenna piece. The coaxial multi-stage patch generates electromagnetic radiation and improves the antenna bandwidth and radiation directivity, thereby increasing the gain and reducing an antenna volume.

Description

technical field [0001] The invention relates to the field of reading and writing of radio frequency tag base stations, in particular to a wide-band high-gain circularly polarized patch quasi-Yagi antenna. Background technique [0002] As an indispensable and important component in systems such as wireless communication systems and radar systems, antenna performance determines the performance and quality of the entire wireless system. With the comprehensive advancement of wireless communication technologies represented by 5G and the Internet of Things, it is urgent to develop high-quality antenna components suitable for their application scenarios. As an important branch of antennas, circularly polarized antennas are widely used in mobile communications, millimeter wave communications, satellite communications, and electronic countermeasures. [0003] At present, the commonly used circularly polarized antennas can be roughly divided into orthogonal dipole-to-circularly polar...

AI Technical Summary

Problems solved by technology

This type of antenna is limited by the dipole structure and the placement of the reflective floor, and has disadvantages such as large antenna volume; at the same time, it is limited by the gain of a single dipole antenna, and the overall gain of the antenna is not high; in the existing design, In order to realize the fixing of the antenna, etc., a dielectric substrate is used as a support, which introduces disadvantages such as dielectric loss and increased production cost.

[0006] The circularly polarized Yagi antenna commonly used at present is limited by its structure, and its bandwidth, especially the circularly polarized bandwidth, is relatively narrow.

And although the gain can be very high, the length will be particularly large when the gain is high

[0007] As far as the commonly used microstrip circularly polarized antenna is concerned, due to the limitations of the structure and principle of the microstrip antenna, there are shortcomings such as narrow antenna bandwidth; for the microstrip patch antenna that uses a dielectric for miniaturization design, dielectric loss will be introduced , to reduce the antenna gain; for the microstrip circular polarization scheme of double-feed and multi-feed points, it is necessary to build a feed network, which has disadvantages such as large size

[0008] As far as the commonly used helical antenna is concerned, the helical antenna is limited by the mechanism of circular polarization and has disadvantages such as large volume; at the same time, the antenna has a single structure and has disadvantages such as inflexible design

[0009] For the circularly polarized horn antennas commonly used at present, the high directivity and gain of the horn antenna are based on the large size, so the horn antenna has the disadvantage of large volume; the realization of the circular polarization of the horn antenna is based on the circular polarization On the polarizer, the circular polarizer is difficult to process and adjust in the horn antenna, and there are disadvantages such as difficult processing

[0010] In summary, currently commonly used orthogonal dipole pair antennas and Yagi antennas are limited by their own performance and circular polarization realization principles, and have disadvantages such as large physical size, limited gain, low bandwidth, and difficulty in miniaturization; microstrip Circularly polarized antennas are limited by microstrip antenna elements, and have disadvantages such as narrow antenna operating bandwidth and insufficient gain; helical antennas, which rely on axial working modes, have disadvantages such as large volume and low design flexibility; circularly polarized horns Antennas have disadvantages such as large volume and difficult processing

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