A modified Wheeler cap method for radiation efficiency measurement of balanced electrically small antennas

Jiaying Zhang; Sergey Pivnenko; Olav Breinbjerg

A modified Wheeler cap method for radiation efficiency measurement of balanced electrically small antennas

Jiaying Zhang
, Sergey Pivnenko
, Olav Breinbjerg

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Abstract

Measurement of radiation efficiency for ultra small antennas represents a great challenge due to influence of the feeding cable. The Wheeler cap method is often used to measure the radiation efficiency of small antennas. However, it is well applicable for antennas on a ground plane, but not for balanced antennas like loops or dipoles. In this paper, a modified Wheeler cap method is proposed for the radiation efficiency measurement of balanced electrically small antennas and a three-port network model of the Wheeler cap measurement is introduced. The advantage of the modified method is that it is wideband, thus does not require any balun, and both the antenna input impedance and radiation efficiency can be obtained. An electrically small loop antenna and a wideband dipole were simulated and measured according to the proposed method and the results of measurements and simulations are presented. The obtained results are also compared with the results from a spherical near-field measurements in an anechoic chamber and a good agreement is observed.

Original language	English
Title of host publication	EuCAP 2010
Publisher	IEEE
Publication date	2010
Pages	1-5
ISBN (Print)	978-1-4244-6431-9
Publication status	Published - 2010
Event	4th European Conference on Antennas and Propagation - Barcelona, Spain Duration: 12 Apr 2010 → 16 Apr 2010 Conference number: 4 http://www.eucap2010.org/

Conference

Conference	4th European Conference on Antennas and Propagation
Number	4
Country/Territory	Spain
City	Barcelona
Period	12/04/2010 → 16/04/2010
Internet address	http://www.eucap2010.org/

Bibliographical note

Copyright 2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

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title = "A modified Wheeler cap method for radiation efficiency measurement of balanced electrically small antennas",

abstract = "Measurement of radiation efficiency for ultra small antennas represents a great challenge due to influence of the feeding cable. The Wheeler cap method is often used to measure the radiation efficiency of small antennas. However, it is well applicable for antennas on a ground plane, but not for balanced antennas like loops or dipoles. In this paper, a modified Wheeler cap method is proposed for the radiation efficiency measurement of balanced electrically small antennas and a three-port network model of the Wheeler cap measurement is introduced. The advantage of the modified method is that it is wideband, thus does not require any balun, and both the antenna input impedance and radiation efficiency can be obtained. An electrically small loop antenna and a wideband dipole were simulated and measured according to the proposed method and the results of measurements and simulations are presented. The obtained results are also compared with the results from a spherical near-field measurements in an anechoic chamber and a good agreement is observed.",

author = "Jiaying Zhang and Sergey Pivnenko and Olav Breinbjerg",

note = "Copyright 2010 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.; 4th European Conference on Antennas and Propagation, EuCAP 2010 ; Conference date: 12-04-2010 Through 16-04-2010",

year = "2010",

language = "English",

isbn = "978-1-4244-6431-9",

pages = "1--5",

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publisher = "IEEE",

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TY - GEN

T1 - A modified Wheeler cap method for radiation efficiency measurement of balanced electrically small antennas

AU - Zhang, Jiaying

AU - Pivnenko, Sergey

AU - Breinbjerg, Olav

N1 - Conference code: 4

PY - 2010

Y1 - 2010

N2 - Measurement of radiation efficiency for ultra small antennas represents a great challenge due to influence of the feeding cable. The Wheeler cap method is often used to measure the radiation efficiency of small antennas. However, it is well applicable for antennas on a ground plane, but not for balanced antennas like loops or dipoles. In this paper, a modified Wheeler cap method is proposed for the radiation efficiency measurement of balanced electrically small antennas and a three-port network model of the Wheeler cap measurement is introduced. The advantage of the modified method is that it is wideband, thus does not require any balun, and both the antenna input impedance and radiation efficiency can be obtained. An electrically small loop antenna and a wideband dipole were simulated and measured according to the proposed method and the results of measurements and simulations are presented. The obtained results are also compared with the results from a spherical near-field measurements in an anechoic chamber and a good agreement is observed.

AB - Measurement of radiation efficiency for ultra small antennas represents a great challenge due to influence of the feeding cable. The Wheeler cap method is often used to measure the radiation efficiency of small antennas. However, it is well applicable for antennas on a ground plane, but not for balanced antennas like loops or dipoles. In this paper, a modified Wheeler cap method is proposed for the radiation efficiency measurement of balanced electrically small antennas and a three-port network model of the Wheeler cap measurement is introduced. The advantage of the modified method is that it is wideband, thus does not require any balun, and both the antenna input impedance and radiation efficiency can be obtained. An electrically small loop antenna and a wideband dipole were simulated and measured according to the proposed method and the results of measurements and simulations are presented. The obtained results are also compared with the results from a spherical near-field measurements in an anechoic chamber and a good agreement is observed.

M3 - Article in proceedings

SN - 978-1-4244-6431-9

SP - 1

EP - 5

BT - EuCAP 2010

PB - IEEE

T2 - 4th European Conference on Antennas and Propagation

Y2 - 12 April 2010 through 16 April 2010

ER -

A modified Wheeler cap method for radiation efficiency measurement of balanced electrically small antennas

Abstract

Conference

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