Wideband circularly polarized rectangular DRA fed with dual pair of right-angled microstrip line

In this article, design and development of wideband circularly polarized CP rectangular dielectric resonator antenna RDRA is presented. To generate wideband CP in proposed antenna, different feeding mechanism have been studied. Three antenna configurations based on different feeding have been discussed using single and dual pair of microstrip lines aligned perpendicular to each other to generate orthogonal modes resulting in circular polarization. It has been claimed here that excitation of RHCP/LHCP field and its direction of radiation could be controlled using height of microstrip feed lines. Finally antenna configuration-3 is fabricated and measured which shows 36.8% of input impedance bandwidth 3.48-5.05 GHz and axial ratio bandwidth of 14.46% 3.67-4.24 GHz in broadside direction at i¾?=0i¾?, i¾?=0i¾?. The final proposed structure exhibits consistent far-field characteristics with average LHCP gain of 6.4 dB and almost stable radiation efficiency in entire operational frequency range. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:713-723, 2016.

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