In this paper, different methods for measuring the input ( ) impedance of a quadrifilar helix QFH antenna are presented along with the underlying physical theory. Shortcomings of the known slotted line method are discussed. New practical and efficient ways of the input impedance deri¨ation based on
Evaluation of the complex antenna factor of a dipole antenna by measuring the S-parameters of the balun
β Scribed by Hisato Hosoyama; Takashi Iwasaki; Shinobu Ishigami
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 229 KB
- Volume
- 123
- Category
- Article
- ISSN
- 0424-7760
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β¦ Synopsis
The complex antenna factor (CAF) of a dipole antenna with a balun is evaluated by calibrating the S parameters of the balun and calculating the effective length of the antenna element in the frequency range of 600 MHz to 2 GHz. The result is compared with that of the conventional three-antenna method. The CAF values obtained by the two methods agree in their absolute values up to 1.2 GHz. Concerning the phases of CAF, two results are close in the whole band.
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