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Compact Wideband Bandpass Filters Using Stepped-Impedance Resonators and Interdigital Coupling Structures

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2 Author(s)
Cheng-Hsien Liang ; Dept. of Commun. Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Chi-Yang Chang

This letter proposes a microstrip lambda/4 interdigital stepped-impedance resonator whose impedance ratio can be very low and coupling strength between adjacent resonators can be very large. On the basis of the proposed structure, one four-pole Chebyshev and one four-pole generalized Chebyshev filter with 0.05 dB equal-ripple bandwidths of 48% and 46%, respectively, are designed and fabricated. Both implemented filters have a compact size, a wide passband, a wide upper stopband, and a high spurious passband at near 5.1 times the center frequency. Good agreement between measurements and simulations is observed.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:19 ,  Issue: 9 )