Abstract
A novel planar low-profile cavity-backed slot antenna for circularly polarized applications is presented in this paper. The low-profile substrate integrated waveguide (SIW) cavity is constructed on a single PCB substrate with two metal layers on the top and the bottom surfaces and metallized via array through the substrate. The SIW cavity is fed by a SIW transmission line. The two orthogonal degenerate cavities resonanceTM110mode are successfully stimulated and separated. The circularly polarized radiation has been generated from the crossed-slot structure whose two arms’ lengths have slight difference Its gain is higher than 5.4 dBi, the peak cross-polarization level is lower than −22 dB, and the maximum axial ratio (AR) is about −1.5 dB. Compared with the previous presented low-profile cavity-backed slot antenna work, the spurious radiation from the proposed antenna’s feeding element is very low and it has less interference on the following circuits.
Highlights
With development of modern wireless communication technology, high-performance antennas become more and more important
Polarized substrate integrated waveguide (SIW) cavity-backed slot antenna has been presented in [1], in which the antenna is fed by transition between microstrip lines and grounded coplanar waveguides (CPWG)
We propose a SIW cavity-backed crossed, slot antenna for circularly polarized application
Summary
With development of modern wireless communication technology, high-performance antennas become more and more important. Polarized SIW cavity-backed slot antenna has been presented in [1], in which the antenna is fed by transition between microstrip lines and grounded coplanar waveguides (CPWG). In order to avoid the spurious radiation generated by the opening feed structures such as microstrip line, coplanar waveguide (CPW), and CPWG, a single probe SIW cavity crossed-slot antenna for circularly polarized application has been proposed in [3]. Slot etched in the SIW cavity metallic surface serves as a radiator and acts as an equivalent load to the filter This filtering antenna is fed by a composite structure which comprise CPWG and SIW. The spurious radiation generated by the feeding element is suppressed and the mutual coupling interference between the proposed antenna and the following circuits is greatly reduced
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