Near-field characteristics of an L-probe fed patch antenna mounted on a finite ground plane

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)22_Publication in policy or professional journalNot applicable

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Original languageEnglish
Pages (from-to)26-29
Journal / PublicationHKIE Transactions Hong Kong Institution of Engineers
Issue number4
Publication statusPublished - Dec 2004


In this paper, the near-field characteristics of an L-probe patch antenna on a finite ground plane are presented. The objective is to thoroughly comprehend the effects of the L-probe on the performance of the patch antenna based on the computation using the finite-difference time-domain method. The L-probe fed patch antenna has shown a bandwidth (SWR ≤ 2) of 30% and an average gain of 7 dBi with a supporting foam substrate of thickness around 0.7 operating wavelength. The L-probe patch antenna is simple in structure and is a good candidate of base-station antennas for various mobile phone systems and other wireless communication systems. First, a set of typical computed and measured results for input impedance, far-field radiation patterns and gain of the L-probe patch antenna on a finite ground plane are provided to validate the method and give references for near-field explanations. Then, the electric current distributions on the patch and on the finite ground plane are calculated to understand their effects on the radiation properties. In addition, the steady-state profiles of the vertical electrical field component underneath the patch antenna are provided as well.

Research Area(s)

  • Bandwidth Widening, FDTD Methods, Microstrip Antennas