Impedance Method for a Shielded Standard Loop Antenna

Author

Ishii, Masanori ; Komiyama, Koji

Author_Institution

National Inst. of Adv. Ind. Sci. & Technol., Japan Nat. Metrol. Inst., Tsukuba

Volume

56

Issue

2

fYear

2007

fDate

4/1/2007 12:00:00 AM

Firstpage

422

Lastpage

425

Abstract

A new measurement method for magnetic antenna factor, called the impedance method, is applied to the calibration of a shielded standard loop antenna. Generally, the magnetic antenna factor is defined in the far-field condition. However, it is difficult to realize the far-field condition when the electromagnetic wave is generated by electrically small antennas in a frequency range below 30 MHz. Although some methods have been proposed earlier, they present difficulties. It is possible to obtain the magnetic antenna factor of an electrically small loop antenna from Faraday´s law and the input impedance of the antenna. In this paper, a comparison is made between a numerical simulation and experimental results. It shows that the impedance method is simple and efficient for calibrating a standard loop antenna

Keywords

Faraday effect; electric impedance measurement; electromagnetic shielding; loop antennas; Faraday´s law; electromagnetic wave; far-field condition; impedance method; magnetic antenna factor; shielded standard loop antenna; Antenna measurements; Electromagnetic measurements; Frequency; Impedance measurement; Loaded antennas; Magnetic field measurement; Magnetic shielding; Measurement standards; Numerical simulation; Receiving antennas; Faraday´s law; input impedance; magnetic antenna factor; small circular shielded standard loop antenna;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/TIM.2007.890794

Filename

4126879