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UWB Bandpass Filter Using Microstrip-to-CPW Transition With Broadband Balun

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3 Author(s)
Jung-Woo Baik ; Korea Univ., Seoul ; Tae-Hak Lee ; Young-Sik Kim

A novel ultra-wideband bandpass filter (BPF) is presented using a back-to-back microstrip-to-coplanar waveguide (CPW) transition employed as the broadband balun structure in this letter. The proposed BPF is based on the electromagnetic coupling between open-circuited microstrip line and short-circuited CPW. The equivalent circuit of half of the filter is used to calculate the input impedance. The broadband microstip-to-CPW transition is designed at the center frequency of 6.85 GHz. The simulated and measured results are shown in this letter.

Published in:

IEEE Microwave and Wireless Components Letters  (Volume:17 ,  Issue: 12 )