An improved chip antenna circuit model for wideband matching

Allen Hollister; John T. Armstrong

doi:10.1117/12.885038

24 May 2011 An improved chip antenna circuit model for wideband matching

Allen Hollister, John T. Armstrong

Proceedings Volume 8061, Wireless Sensing, Localization, and Processing VI; 80610K (2011) https://doi.org/10.1117/12.885038
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

An improved antenna circuit model is presented, which utilizes a transmission line to rotate s11 values to better fit measured data. Antennas are frequently modeled as either a series or parallel resonant circuit, the results of which are only exact over a small range of frequencies in the vicinity of resonance. These simple models are inadequate at frequencies distant from the antenna resonant frequency, however. Single-point matching, which preserves impedance match near resonance, cannot be used to design matching networks where there is a requirement to operate on frequencies other than the natural resonant frequency of the antenna, while maintaining a good impedance match. This paper describes an antenna model that uses a transmission line as a modeled circuit component. The transmission line allows the modeled impedances to be rotated about the Smith chart (transformed) in such a way as to closely match measured antenna impedance data from a vector network analyzer. The resulting matching network is valid over a very wide range of frequencies and allows precision matching networks (within a measurement error of ~2%) to be created. Measured results from a variety of antennas show high correlation with the theoretical circuit model.

Citation Download Citation

Allen Hollister and John T. Armstrong "An improved chip antenna circuit model for wideband matching", Proc. SPIE 8061, Wireless Sensing, Localization, and Processing VI, 80610K (24 May 2011); https://doi.org/10.1117/12.885038

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