Some methods of analysis of a probe-fed microstrip disk antenna

W. C. Chew, Z. Nie, Q. H. Liu, Y. T. Lo

Research output: Contribution to journalConference articlepeer-review

Abstract

The authors present three methods (with increasing complexity) of incorporating the gap capacitance of the probe basis into the input impedance calculation of a probe-fed antenna. They are the variational formula, the mode-matching method, and the mode-matching method with a diaphragm. It is noted that in the previous approach the gap capacitance of the probe base that shunts the input impedance of the microstrip antenna is not included in the input impedance. Under the single-mode approximation, the mode-matching methods are identical to the variational formula. However, when a diaphragm is present, the single-mode approximation is insufficient. Therefore, the variational formula is inaccurate when a diaphragm exists. The theory shows that the effect of the gap capacitance at the coaxial aperture on the input impedance of the microstrip antenna is important when the dielectric substrate is thick. The theories agree well with experiment data with no fudge factors.

Original languageEnglish (US)
Pages (from-to)346-349
Number of pages4
JournalIEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
Volume1
StatePublished - Dec 1 1990
Event1990 Antennas and Propagation Symposium Digest - Dallas, TX, USA
Duration: May 7 1990May 11 1990

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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