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Compact Ultra-Wideband (UWB) Bandpass Filters With Multiple Notched Bands

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2 Author(s)
Kaijun Song ; State Key Lab of Millimeter Waves, Department of Electronic Engineering, EHF Key Lab of Fundamental Science, School of Electronic Engineering, City University of Hong Kong, University of Electronic Science and Technology of China, Hong Kong, Chengdu, China ; Quan Xue

A novel asymmetric coupling strip is presented, which can be used in the ultra-wideband (UWB) bandpass filter (BPF) to generate multiple notched bands within the passband. The proposed structure can provide two main paths for the signals, which makes it possible to generate multiple transmission zeroes. The center frequencies and bandwidths of the notched bands can be controlled by tuning the structural parameters. The asymmetric coupling strip has been integrated into a circular disc resonator to construct a compact UWB BPF with multiple notched bands. The measured results agree with the predicted ones closely. These two notched bands centered at 4.3 and 8 GHz have 10-dB rejection fractional bandwidths of about 4.2% and 3.8%, respectively.

Published in:

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