Left-handed and right-handed rotation circular polarization reconfigurable slot antenna

Abstract

The invention discloses a left-handed and right-handed rotation circular polarization reconfigurable slot antenna, which comprises a medium base plate, a first switching diode, a second switching diode and a direct current power supply, wherein metal ground is arranged on the upper surface of the metal medium base plate; the lower surface of the medium base plate is provided with a microband structure; an annular radiation slot is formed in the middle in the metal ground; the metal ground is separated into inner side metal and outer side metal by the annular radiation slot; the first switching diode and the second switching diode are in reverse span joint in a position between inner side metal and the outer side metal of the annular radiation slot; and two electrodes of the direct current power supply are connected with the inner side metal and the outer side metal separated by the annular radiation slot through two conducting wires. The microband structure couples energy to the annular radiation slot; an annular radiation slop main mode is split into two identical-amplitude quadrature-phase degeneracy modes by a packaging inductor for conducting the switching diodes; the circular polarization radiation characteristics are further realized; the conduction and cut-off states of the two switching diodes are switched; and the goal of reconfiguring the circular polarization electromagnetic wave rotation direction can be achieved.

Description

technical field [0001] The invention belongs to the technical field of antennas, in particular to a reconfigurable slot antenna with left and right circular polarization. Background technique [0002] The antenna is a key component of the wireless communication system, which plays the role of energy conversion between the guided electromagnetic wave and the radiated electromagnetic wave. Compared with linearly polarized antennas, circularly polarized antennas have the outstanding advantages of resisting rain and fog attenuation, suppressing multipath interference signals, and relaxing the installation orientation restrictions of receiving and transmitting antennas. Left and right circularly polarized reconfigurable antennas are beneficial to eliminate the energy fading problem caused by multipath effects, realize a polarization modulation system with better performance, support frequency multiplexing and increase system communication capacity. Therefore, it is of great sign...

AI Technical Summary

Problems solved by technology

The main problems in the existing left and right circularly polarized reconfigurable slot antennas include: the number of switching diodes is large, the DC bias circuit is complicated, and there is still much room for improvement; the volume is too large to meet the miniaturization of wireless communication equipment The development trend of circular polarization excitation technology and polarization reconfigurable technology are independent of each other, and the switching diode as the key device of reconfigurable technology is only regarded as an ideal switch, and its characteristics have not been fully utilized.

This article uses two switching diodes and a single-layer dielectric substrate to improve the traditional "L" type microstrip feeder into an "arrow" type microstrip feeder, combining the switching characteristics and low on-resistance characteristics of the switching diodes, so that the radiated electromagnetic waves can be left-handed Switch between circular polarization and right-hand circular polarization, but the size of the antenna is too large, which is not conducive to the application of miniaturized wireless communication equipment

Images