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A Novel Ultra-Wideband Differential Filter Based on Double-Sided Parallel-Strip Line

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3 Author(s)
Xiao-Hua Wang ; Dept. of Electron. Eng., City Univ. of Hong Kong, Hong Kong, China ; Quan Xue ; Wai-Wa Choi

In this letter, double-sided parallel-strip line (DSPSL) has been used to build a novel differential filter with ultra- wideband (UWB) response. Swap structures, based on DSPSL, are employed in the design to realize 180° phase shift. So the swap structures can realize the conversion between differential- and common-mode. Utilizing the characteristic, the input common- mode signals will be cancelled at the center of the filter, while the input differential-mode signals can propagate in the proposed filter. The proposed new differential filter was calculated in analytical method, and was simulated by the full-wave electromagnetic simulator, and was validated by the measurement. The last results show they have a good in-band and out-band performance. With fractional bandwidth of 110% centered at 3 GHz, the differential-mode signals can propagate with UWB frequency response, while the common-mode signals are suppressed below -20 dB in the whole frequency band.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:20 ,  Issue: 8 )