Microstrip Coupled-Line Bandpass Filters
Date Issued
2006
Date
2006
Author(s)
Liu, Yung-Yuan
DOI
zh-TW
Abstract
In this thesis, the parallel coupled lines are used to design the microstrip bandpass filters. The main objectives of this study are to improve the selectivity and to suppress the spurious responses of bandpass filters.
By suitably introducting the cross-coupling path in the filter circuit, multiple transmission zeros may be generated to improve the filter selectivity.
The filters based on quarter-wavelength coupled line have spurious passbands at odd-multiples of passband center frequency. In this study, the coupled-line sections are made shorter than quarter wavelength so that the spurious response may be suppressed. The next spurious passband then appears around five times the center frequency.
Subjects
濾波器
耦合線
傳輸零點
filters
coupled-line
transmission zeros
Type
thesis
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