On the Circularly Polarized Parallel-Plate Antenna

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Original languageEnglish
Article number8805225
Pages (from-to)3-12
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number1
Online published19 Aug 2019
Publication statusPublished - Jan 2020


A circularly polarized (CP) broad-beam parallel-plate (PP) antenna is investigated. The difference between the phase velocities of two PP orthogonal modes is used to obtain CP fields. The two orthogonal modes are excited by an inclined slot fabricated on the ground plane that connects the two PPs. By tuning the slot length, the impedance can be easily matched. To reduce the cross-polarized fields, a modified CP PP antenna with semicircular plates is introduced. ANSYS HFSS was used to simulate the antennas and prototypes were fabricated to verify the simulations. Both the original and modified CP PP antennas have an overlapping antenna bandwidth of 13.0% and an antenna gain of 8 dBic. As compared with other broad-beam antennas, the two PP antennas have simpler and larger structures, easing their fabrications especially at millimeter-wave frequencies. A design guideline is developed.

Research Area(s)

  • Antenna radiation patterns, broadband antennas, circular polarization, millimeter-wave (mm-Wave) propagation, mobile antennas, parallel plate (PP), slot antenna