Super-surface based variable-polarization multifunctional microstrip array antenna

Abstract

The invention belongs to the technical field of microstrip array antennae and particularly relates to a super-surface based variable-polarization multifunctional microstrip array antenna. The microstrip array antenna consists of a feed source and a microstrip array, wherein the feed source is arranged at a focus of the microstrip array; the feed source is a broadband Vivaldi antenna, adopts microstrip coupled feed, and consists of upper slotting metal, a middle dielectric plate and a lower microstrip line; the microstrip array consists of N*N GMS units; each GMS unit is composed of three layers of metal structures and two layers of dielectric plates; each layer of metal structure is obtained by etching CDSRRs with different rotational angles on a square patch; the upper, middle and lower structures are identical in parameter; and only the CDSRRs are clockwise rotated at an angle of 45 degrees in sequence. According to the antenna, a reflection function and a transmission function are integrated, the function switching among the reflection function, a bidirectional radiation function and the transmission function of the microstrip array is realized, and the polarization state switching between a co-polarization state and a cross-polarization state is realized. The antenna has the characteristics of high reusability, high integration level, numerous functions and the like.

Description

technical field [0001] The invention belongs to the technical field of microstrip array antennas, in particular to a metasurface-based multi-functional microstrip array antenna with variable polarization. Background technique [0002] The concept of the reflectarray antenna was first proposed by Berry et al. in 1963 and was verified by experiments. It mainly relies on correcting the phase of the array unit to achieve the required radiation performance. However, due to the use of an apertured waveguide as a phase shift unit, it is bulky and heavy. Until the 1990s, with the continuous maturity of printed circuit technology and the gradual rise of planar microstrip antenna research, reflectarray antennas have revived. The strong interest and research boom of researchers around the world has become a research hotspot in the field of antennas and academia, and related applied research has also entered an unprecedented period of prosperity. The microstrip planar reflectarray ante...

AI Technical Summary

Problems solved by technology

On the one hand, due to the half-wave resonance of the traditional reflective and transmissive array units, the size is relatively large, and the phase shift range of the unit is limited when the amplitude requirements are met, and it is difficult to fully achieve 360° coverage

On the other hand, according to the Foster reactance theorem, the derivative of the phase response of the unit in the passive circuit to the frequency is always positive and the dispersion is strong at the resonance, the phase changes sharply and the bandwidth is limited by the Bode-Fano constraints, the working of the antenna Bandwidth and efficiency are limited

Images