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Compact Wideband Differential Bandpass Filters Using Half-Wavelength Ring Resonator

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4 Author(s)
Wenjie Feng ; Dept. of Commun. Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China ; Wenquan Che ; Yalin Ma ; Quan Xue

A new compact wideband differential bandpass filters with wideband common mode suppression using half-wavelength ring resonator is presented in this letter. Five-order passband for the wideband differential mode with two transmission zeros close to the passband is realized with four open stubs. A planar wideband differential filter (3 dB fractional bandwidth 79%) with wideband common mode suppression is designed and fabricated. The theoretical and measured results agree well and show good in-band filtering performances and high selectivity.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:23 ,  Issue: 2 )