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Balanced-to-Unbalanced Bandpass Filters and the Antenna Application

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4 Author(s)
Chung-Hwa Wu ; Dept. of Electr. Eng. & Grad. Inst. of Commun. Eng., Nat. Taiwan Univ., Taipei ; Chi-Hsueh Wang ; Shih-Yuan Chen ; Chun Hsiung Chen

Novel balanced-to-unbalanced (balun) bandpass filters are presented and carefully examined. By properly converting a symmetric four-port balanced-to-balanced bandpass filter to a three-port device, with two ports forming a balanced output and one port remaining unbalanced, a novel three-port balun bandpass filter with both functions of balun and bandpass filter may be realized. Specifically, a balun bandpass filter is implemented with its center frequency at 0.99 GHz and a 3-dB fractional bandwidth (Bomega) of 10.1%. The implemented balun bandpass filter presents an excellent in-band balance performance with common-mode rejection ratio (Rcm) better than 41 dB (the corresponding amplitude and phase imbalances are within 0.003deg and 1deg) over the pass- band. In this study, a wideband balun bandpass filter is also implemented so as to improve the wideband performance of the quasi- Yagi antenna. Being integrated with the proposed wideband balun bandpass filter, the implemented quasi-Yagi antenna achieves a bandwidth of 48% for IS11 | < -10 dB, with front-to-back ratio better than 13 dB, cross-polarization smaller than -20 dB, and peak gain of 3-5 dBi within the wide operating bandwidth.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:56 ,  Issue: 11 )

Date of Publication:

Nov. 2008

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