Design of stacked circular/quasi-elliptical patch array for broadband CP applications

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Conference Proceeding
ISAPE 2003 - 2003 6th International Symposium on Antennas, Propagation and EM Theory, Proceedings, 2003, pp. 62 - 65
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© 2003 IEEE. This paper presents a design of circularly polarised I- element planar subarray composed of low axial-ratio stacked patch elements in X-band. The wideband circular polarisation is excited by using stacked circular disc and quasi-elliptical patch that printed on a superstrate with low dielectric constant (ε. = 2.2) Olid a high dielectric constant (ε r= 6.15) material as the substrate, respectively. The proposed element exhibits low mutual coupling in two principle planes that is comparable to a single-layer circular patch antenna. To determine.the optimal element spacing inside the subarray, a pair of microstrip-line fed elements iras considered and arranged in four scenarios. Low sidelobe levels and 2-dB axial-ratio bandwidth of 19.5% in addition to a boresight axial-ratio of 0.15 dB are achieved. Variations in gain and axial ratio other than boresight (9 £ 0) in azimuth plane are also examined.
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