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Abstract
In this Letter, a quarter cylindrical dielectric resonator antenna (Q-CDRA) with a low profile and circular polarisation (CP) is presented for wideband and multiple-input-multiple-output (MIMO) systems. The approach used to obtain a reduced wideband CP antenna is realised by deforming the geometry of the CDR to a quarter cylinder and using a quasi-spiral feedline to excite two resonant modes in phase quadrature (HEM 11 and HEM 12 ). The proposed design exhibits a wide-impedance bandwidth (BW) of 34% (4.4-6.2 GHz) with a low measured coupling level<;-15 dB, and an axial ratio BW of 24.4% (4.5-5.75 GHz). The antenna gain is stable through the operating BW with a gain peak of 6.4 dBi. In addition, the antenna has a low cross-polarisation in the boresight direction with low envelope correlation coefficient<;0.03. The presented design is suitable for RHCP WLAN applications.
Published Version
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