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This paper presents a broadband circularly polarized (CP) cavity-backed antenna array for switched beam applications. The antenna array consists of four SIW CP slot elements which are in a 2 × 2 combination and uses a Butler feeding network. To improve the performance of array’s CP purity, SIW elements in antenna are sequentially rotated with respect to each other. Extracted results show that the antenna has 1.9 GHz impedance bandwidth between the frequency ranges of 9.08 and 10.96 GHz (∼40%). The minimum 3 dB axial ratio bandwidth between ports supports the 9.35–10.37 GHz. The measured peak gain of the presented array is 13.1 dBic that could scan solid angle ∼25 steradian.

A Multi-Layer Circularly Polarized Cavity-Backed SIW Beam Steering Array for Satellite Application