1. Design Considerations on the Minimum Size of Broadband Antennas for UWB Applications.
- Author
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Saitou, Akira, Aoki, Kazuhiro, Honjo, Kazuhiko, and Watanabe, Koichi
- Subjects
ANTENNAS (Electronics) ,DIFFERENTIAL geometry ,IMPEDANCE matching ,MICROWAVE antennas ,ULTRA-wideband antennas ,ULTRA-wideband devices ,ANTENNA radiation patterns ,DATA transmission systems - Abstract
The practical realization of Chu's minimum-sized antenna is investigated using self-complementary antennas. Rigorous bandwidth formulas for broadband antennas are derived for broadband antennas based on Chu's fundamental mode equivalent circuit. By comparing input impedances and radiation patterns, the fabricated self-complementary antenna used for Japan's ultra-wideband higher band (7.25-10.25 GHz) is found approximated by the minimum-sized antenna. Using the rigorous bandwidth formulas above, the fabricated antenna is shown to be smaller than the minimum-sized antenna. This breakthrough is achieved by using a more complicated matching circuit for broadband antennas instead of the single-stage inductor used in bandwidth estimation with the Q factor. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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