A novel planar low-profile cavity-backed slot antenna for circularly polarized applications is presented in this paper. The lowprofile\r\nsubstrate integrated waveguide (SIW) cavity is constructed on a single PCB substrate with two metal layers on the top and\r\nthe bottom surfaces and metallized via array through the substrate. The SIW cavity is fed by a SIW transmission line. The two\r\northogonal degenerate cavities resonance TM110 mode are successfully stimulated and separated.The circularly polarized radiation\r\nhas been generated fromthe crossed-slot structure whose two arms� lengths have slight difference Its gain is higher than 5.4 dBi, the\r\npeak cross-polarization level is lower than -22 dB, and themaximum axial ratio (AR) is about -1.5 dB. Compared with the previous\r\npresented low-profile cavity-backed slot antenna work, the spurious radiation from the proposed antenna�s feeding element is very\r\nlow and it has less interference on the following circuits.
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