Title :
Design of stacked circular/quasi-elliptical patch array for broadband CP applications
Author :
Chung, Kwok L. ; Mohan, Ananda S.
Author_Institution :
Fac. of Eng., Univ. of Technol., Sydney, NSW, Australia
fDate :
Oct. 28 2003-Nov. 1 2003
Abstract :
This paper presents a design of circularly polarised 4-element planar subarrays composed of low axial-ratio stacked patch elements in X-band. The wideband circular polarisation is excited using stacked circular disc and quasi-elliptical patch that printed on a superstrate with low dielectric constant (/spl epsi/ = 2.2) and a high dielectric constant (/spl epsi/ = 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 inside the subarray, a pair of microstrip-line fed elements was 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 are achieved. Variations in gain and axial ratio other than boresight (/spl theta/ /spl ne/ 0) in azimuth plane are also examined.
Keywords :
antenna radiation patterns; broadband antennas; electromagnetic wave polarisation; microstrip antenna arrays; permittivity; X-band; broadband CP applications; circular patch array; circular polarisation; coupled patch; dielectric constant; microstrip-line fed elements; mutual coupling; planar subarrays; quasielliptical patch array; singly-fed circularly polarised; Azimuth; Bandwidth; Dielectric constant; Dielectric materials; Dielectric substrates; High-K gate dielectrics; Microstrip; Mutual coupling; Polarization; Wideband;
Conference_Titel :
Antennas, Propagation and EM Theory, 2003. Proceedings. 2003 6th International SYmposium on
Conference_Location :
Beijing, China
Print_ISBN :
0-7803-7831-8
DOI :
10.1109/ISAPE.2003.1276628
