Low-cost vertical patch antenna with wide axial-ratio beamwidth for handheld satellite communications terminals

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

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Original languageEnglish
Article number7041155
Pages (from-to)1417-1424
Journal / PublicationIEEE Transactions on Antennas and Propagation
Issue number4
Online published12 Feb 2015
Publication statusPublished - Apr 2015


This paper presents a low-cost circularly polarized (CP) small antenna for handheld satellite communications terminals in S-band. It consists of an elliptical vertical patch antenna (VPA) element backed by an elliptical air cavity of different ellipticity. Two dielectric substrates, each with an elliptical opening, are stacked together and mounted onto a ground plane. The rim on the smaller opening of the upper substrate is conveniently plated with conductor to form the VPA, whereas the larger opening of the lower substrate and the ground plane forms the air cavity. The elliptical VPA, when excited by a probe feed, generates CP radiation. Dielectric loading of the VPA not only achieves its size reduction but also widens the 3-dB beamwidth. The fabricated antenna has a measured gain of 5.1 dBic at 3.71 GHz, impedance bandwidth of 12.6%, 3-dB beamwidth of 102° and axial-ratio beamwidth (AR <3.0 dB) of 121°.

Research Area(s)

  • dielectric loaded antenna, satellite communications, wide 3-dB beamwidth

Citation Format(s)