Ultra-wideband Bandpass Filter Based on CPW-microstrip Transition
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Abstract:
In this paper, a ultra-wideband (UWB) bandpass filter based on the CPW-microstrip transition structure is improved by loaded-stubs. In order to enhance its selectivity, a T-sharp stub is adopted at the center of microstripe line. This T-sharp stub can generate two transmission zeros at the lower and upper passband edges (2GHz and 14GHz). Besides, the upper stopband of this filter is extended to 16 GHz due to a transmission zero introduced by the fan-shaped open stub. Finally, a prototype of the proposed filter is fabricated and measured for verification. The measured results show that this filter achieves a fractional bandwidth of 131%(2. 6 GHz ~12. 5 GHz), while the measured results are in close agreement with the simulated ones.
