A novel compact triple-mode resonator for microstrip bandpass filter design

A novel compact triple-mode resonator is presented in this paper. The triple-mode resonator consists of a square open-loop half-wavelength resonators and a stepped impedance resonator structured in the middle which is connected to the mid-point of the half-wavelength line where a grounding via is lo...

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Bibliographic Details
Main Authors: Ker Chia Lee, Hieng Tiong Su, Haldar, M K
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
Bandpass filter
Chebyshev approximation
Chebyshev bandpass filter
Filtering theory
Frequency measurement
Microwave filters
Resonant frequency
Resonator filters
triple-mode resonator
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Summary:A novel compact triple-mode resonator is presented in this paper. The triple-mode resonator consists of a square open-loop half-wavelength resonators and a stepped impedance resonator structured in the middle which is connected to the mid-point of the half-wavelength line where a grounding via is located. The grounded via effectively splits the half-wavelength line into two quarter-wavelength resonators. The dimension of the resonator is 15 mm × 16.15 mm. The three resonant modes are analyzed and explained using odd and even modes analysis. To demonstrate the design principle, a threepole Chebyshev bandpass filter is designed and measured. The measured filter has center frequency of 1.0 GHz and passband insertion loss of 1.0 dB. The new resonator has a good stopband response and its first spurious response occurs at approximately three times the passband frequency. The simulated and measured results show good agreement.
ISSN:2165-4727
2165-4743