Suppression of Spurious Resonance by Using Multistep Transmission Lines

Miniaturized bandpass filters with high performance have become more and more important in today's wireless communication industry. Bandpass filters implemented with half-wavelength resonators have inherently harmonic frequencies at the multiples of frequency. A novel multistep transmission fil...

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Bibliographic Details
Main Authors: Wen-Tsung Luo, Wen-Jeng Lin, Kuan-Te Lee, Lih-Shan Chen, Shen-Li Fu
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
bandpass filter
Chebyshev approximation
Communication industry
Frequency
multistep
Passband
Power harmonic filters
Resonance
Resonator filters
spurious
transmission line
Transmission lines
Wireless communication
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Summary:Miniaturized bandpass filters with high performance have become more and more important in today's wireless communication industry. Bandpass filters implemented with half-wavelength resonators have inherently harmonic frequencies at the multiples of frequency. A novel multistep transmission filter based on the strip-width modulation reformulation is proposed to suppress the spurious passband at the second harmonics of the operating frequency. A three- stage Chebyshev hairpin type bandpass filter was designed and implemented on FR-4 and alumina ceramic substrates, respectively. The center frequency of the bandpass filter is at 0.9 GHz and the fractional bandwidth is 5%. With the multistep structure, the spurious passband at the second harmonics is suppressed.
DOI:10.1109/EMAP.2006.4430667