Square Dual-Mode Quasi-Elliptic Bandpass Filter with Wide Upper Stopband
APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL(2013)
Abstract
A square dual-mode quasi-elliptic bandpass filter (BPF) with a wide stopband is proposed. To realize the quasi-elliptic response and harmonic suppression for the filter, the inductive source-load coupling is introduced. To achieve wider stopband suppression, the open-circuited stubs are adopted. A demonstration filter with 3-dB fractional bandwidth (2.84 GHz 3.28 GHz) about 14.3 % has been designed, fabricated, and measured. Simulated and measured results indicate that the proposed filter can effectively suppress 6th harmonic response referred to a suppression degree of 16.5 dB.
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Key words
Bandpass filter,dual-mode,quasi-elliptic,wide upper stopband
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