Coplanar waveguide fed broadband ultra-surface antenna

Abstract

The invention relates to the technical field of microwave antennas, in particular to a coplanar waveguide fed broadband ultra-surface antenna, which comprises a first dielectric substrate, a second dielectric substrate, a third dielectric substrate, an electromagnetic ultra-surface part, an excitation layer part and a short-circuit reflecting floor part. Antenna radiation is achieved by using thegap of the ultra-surface, and good broadside characteristic is achieved; a micro-strip loaded butterfly-shaped fed gap is used for coupling excitation of the ultra-surface, thereby successfully exciting three resonant modes in the ultra-surface; the relative midbandwidth reaches 51.2%; compared with the ultra-surface antenna before, the impedance bandwidth is greatly improved; the short-circuit reflecting floor structure is used in the invention so that not only backward radiation suppression of the antenna is realized but also a low-profile design is finished. The coplanar waveguide fed broadband ultra-surface antenna in the invention realizes the broadband radiation bandwidth performance and good radiation characteristic of the planar antenna and can effectively enhance the performance of the antenna in a radar, imaging, wireless communication and other systems.

Description

technical field [0001] The invention relates to the technical field of microwave antennas, in particular to a broadband metasurface antenna fed by a coplanar waveguide. Background technique [0002] In radar, imaging, and wireless communication systems, microstrip antennas play an important role due to their low cost, low profile, reliable performance, and ease of processing and integration. However, the application of the traditional microstrip antenna is often limited by its narrow impedance bandwidth, and the relative bandwidth of the general microstrip antenna is lower than 10%. In the past few decades, a large number of technologies have been proposed to broaden the impedance bandwidth of microstrip antennas. In summary, there are mainly capacitive probe feeding technology, L-shaped probe feeding technology, aperture coupling technology, U-shaped / E Shaped slot technology and stacked chip technology. These technologies can generally increase the relative bandwidth of t...

AI Technical Summary

Problems solved by technology

However, for many practical applications, the impedance bandwidth of these designs is still relatively narrow, so it is necessary to further greatly increase the resonant bandwidth of metasurface antennas.

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