Linearly and Circularly Polarized Filtering Dielectric Resonator Antennas

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Original languageEnglish
Article number8657970
Pages (from-to)3629-3640
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number6
Online published4 Mar 2019
Publication statusPublished - Jun 2019


In this paper, linearly polarized (LP) and circularly polarized (CP) filtering dielectric resonator antennas (DRAs) are presented. They have conducting loops inside them. Equivalent horizontal magnetic dipoles can be obtained from the HEM11δ mode of the DRA and the loop structure. When they are equal in magnitude but opposite in phase, the radiated fields can be canceled out and a good filtering response can be obtained. To demonstrate the idea, both the LP and CP filtering DRAs operating at 2.4 GHz were designed, fabricated, and tested. The reflection coefficient, axial ratio, radiation pattern, antenna gain, and antenna efficiency are studied, and reasonable agreement between the measured and simulated results is found. The LP and CP designs have measured peak realized gains of 5.86 dBi and 5.1 dBic, and out-of-band suppression levels of over 19 and 18 dB, respectively.

Research Area(s)

  • Circular polarization (CP), dielectric resonator antenna (DRA), filtering antenna, linear polarization (LP)