A dual-band circularly polarized dielectric antenna

Abstract

The invention discloses a dual-band circularly polarized dielectric antenna, which belongs to the field of antennas. The technical solution of the present invention is: a dual-band circularly polarized dielectric antenna, including a dielectric substrate, a metal ground plate and a cup-shaped dielectric block disposed on the front of the dielectric substrate, a coaxial cable and a metal back cavity disposed on the back of the dielectric substrate. The dielectric constant of the cup-shaped dielectric block, the radius of the top surface and the bottom surface determine the two operating frequencies of the antenna, and the use of materials with low dielectric constants effectively reduces the production cost of the antenna; by etching open circular grooves on the ground plate In order to realize the circular polarization of the antenna, an additional feeding network is avoided, and the complexity of the system is reduced. The purpose of the invention is to design a dual-band circularly polarized antenna with a simple structure, easy processing, wide axial ratio bandwidth and high radiation efficiency by using low-cost low-permittivity materials.

Description

technical field [0001] The invention belongs to the field of antennas, and in particular relates to a dual-band circularly polarized dielectric antenna. Background technique [0002] In recent years, with the development of wireless communication, dual-band circularly polarized dielectric antennas have received extensive attention. Antenna is a key component in radio equipment, which undertakes the function of energy conversion and directional radiation (or reception), and plays a key role in determining the quality of a wireless communication system. Among the existing antenna types, the dielectric antenna has been widely concerned and applied due to its advantages of easy feeding, small size, high radiation efficiency, and high power capacity. At present, the circularly polarized dielectric antennas used mainly work in the range of a single frequency band. However, in some applications, such as radio frequency identification systems or satellite communication systems, th...

AI Technical Summary

Problems solved by technology

"IEEE TRANSATIONS ON ANTENNAS AND PROPAGATION" 2009, Volume 57, Issue 12, "dual-band circularly polarized dual-slot antenna with a dielectric cover" introduced a dual-band circularly polarized dual-slot antenna with a dielectric cover consisting of a dielectric antenna and a metal cavity antenna. Circularly polarized antenna, but the overall structure of the antenna is relatively complicated and not easy to process

"Compact circularly polarized dualband zonal-slot / DRA hybridantenna without external ground plane" in the paper "Compact circularly polarized dualband zonal-slot / DRA hybridantenna without external ground plane" of "IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS" 2011, Volume 59, Issue 6, introduces a kind of antenna which also consists of a dielectric antenna and a metal cavity antenna. Dual-band circularly polarized antenna, the dielectric antenna is placed above the metal cavity antenna, and the circular polarization is realized through the cross unequal-length slot on the metal cavity, but the size of the antenna is large

"IEEE TRANSATIONS ONANTENNAS AND PROPAGATION", Volume 60, Issue 6, 2012, "linear- / circular-polarization designs of dual- / wide-band cylindrical dielectric resonator antennas" introduces a dual-band circular pole using quadrature feed excitation Dielectric antenna, by using a dual frequency quadrature coupler to provide two quadrature signals to achieve the circular polarization of the antenna, the antenna has 12.4% (1.69-1.89GHz) and 7.4% (2.34-2.52GHz) axial ratio Bandwidth, but the feeding structure of the antenna is complex and the size is large

Images