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International Journal of Antennas and Propagation
Volume 2013 (2013), Article ID 316208, 6 pages
Research Article

Substrate Integrated Waveguide Fed Cavity Backed Slot Antenna for Circularly Polarized Application

Key Laboratory of RF Circuits & System of Ministry of Education, Microelectronic CAD Center, Hangzhou Dianzi University, Xiasha Higher Education Park, Hangzhou 310018, China

Received 13 June 2013; Accepted 28 June 2013

Academic Editor: Bing Liu

Copyright © 2013 Xiao Hong Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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 resonance TM110 mode 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.