Equivalent circuit for antenna-cavity coupling in wheeler's cap technique

Yeqin Huang; Ram M. Narayanan; Govind R. Kadambi

doi:10.1080/02726340590910084

Equivalent circuit for antenna-cavity coupling in wheeler's cap technique

Yeqin Huang, Ram M. Narayanan, Govind R. Kadambi

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

An equivalent circuit is derived for an antenna coupled to a shielding cavity via field analysis. The input impedance of the antenna inside the cavity is then studied theoretically and experimentally. It is shown that the input resistance of the antenna shielded by the cavity is not merely the loss resistance, but is actually the sum of the antenna loss resistance and the coupling resistance between the antenna and cavity. This coupling effect is demonstrated quantitatively by numerical computations for dipole antennas. A method is proposed to avoid the antenna-cavity antiresonance in the measurement of loss resistance of the antenna.

Original language	English (US)
Pages (from-to)	115-131
Number of pages	17
Journal	Electromagnetics
Volume	25
Issue number	2
DOIs	https://doi.org/10.1080/02726340590910084
State	Published - Feb 2005

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Radiation
Electrical and Electronic Engineering

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10.1080/02726340590910084

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title = "Equivalent circuit for antenna-cavity coupling in wheeler's cap technique",

abstract = "An equivalent circuit is derived for an antenna coupled to a shielding cavity via field analysis. The input impedance of the antenna inside the cavity is then studied theoretically and experimentally. It is shown that the input resistance of the antenna shielded by the cavity is not merely the loss resistance, but is actually the sum of the antenna loss resistance and the coupling resistance between the antenna and cavity. This coupling effect is demonstrated quantitatively by numerical computations for dipole antennas. A method is proposed to avoid the antenna-cavity antiresonance in the measurement of loss resistance of the antenna.",

author = "Yeqin Huang and Narayanan, {Ram M.} and Kadambi, {Govind R.}",

note = "Funding Information: Received 9 April 2004; accepted 2 July 2004. This study was supported by Centurion Wireless Technologies and the Nebraska Initiative Mobile Communications Research Project. The authors would like to thank Monty Rohde and Ted Hebron of Centurion Wireless Technologies for useful discussions and suggestions. Address correspondence to Ram M. Narayanan, Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA. E-mail: [email protected]",

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doi = "10.1080/02726340590910084",

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AU - Huang, Yeqin

AU - Narayanan, Ram M.

AU - Kadambi, Govind R.

N1 - Funding Information: Received 9 April 2004; accepted 2 July 2004. This study was supported by Centurion Wireless Technologies and the Nebraska Initiative Mobile Communications Research Project. The authors would like to thank Monty Rohde and Ted Hebron of Centurion Wireless Technologies for useful discussions and suggestions. Address correspondence to Ram M. Narayanan, Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA. E-mail: [email protected]

PY - 2005/2

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N2 - An equivalent circuit is derived for an antenna coupled to a shielding cavity via field analysis. The input impedance of the antenna inside the cavity is then studied theoretically and experimentally. It is shown that the input resistance of the antenna shielded by the cavity is not merely the loss resistance, but is actually the sum of the antenna loss resistance and the coupling resistance between the antenna and cavity. This coupling effect is demonstrated quantitatively by numerical computations for dipole antennas. A method is proposed to avoid the antenna-cavity antiresonance in the measurement of loss resistance of the antenna.

AB - An equivalent circuit is derived for an antenna coupled to a shielding cavity via field analysis. The input impedance of the antenna inside the cavity is then studied theoretically and experimentally. It is shown that the input resistance of the antenna shielded by the cavity is not merely the loss resistance, but is actually the sum of the antenna loss resistance and the coupling resistance between the antenna and cavity. This coupling effect is demonstrated quantitatively by numerical computations for dipole antennas. A method is proposed to avoid the antenna-cavity antiresonance in the measurement of loss resistance of the antenna.

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Equivalent circuit for antenna-cavity coupling in wheeler's cap technique

Abstract

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