https://scholars.lib.ntu.edu.tw/handle/123456789/147607
Title: | Compact Microstrip Bandpass Filters With Good Selectivity and Stopband Rejection | Authors: | Deng, Pu-Hua Lin, Yo-Shen Wang, Chi-Hsueh Chen, Chun-Hsiung |
Keywords: | Bandpass filter;cross-coupling;microstrip;quarter-wavelength resonators | Issue Date: | Feb-2006 | Publisher: | Taipei:National Taiwan University Dept Elect Engn | Journal Volume: | VOL. 54 | Journal Issue: | NO. 2 | Start page/Pages: | - | Source: | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | Abstract: | Compact microstrip bandpass filters (second- and fourth-order) are proposed based on the folded quarter-wavelength ( 4) resonators, which are mainly coupled through the shunt inductors connected to the ground. By introducing a cross-coupling capacitance directly between the input and output ports of the second-order filter, a pair of transmission zeros may be created to improve the selectivity. Moreover, by an extension of the proposed second-order filter with the incorporation of an additional cross-coupling capacitance, a fourth-order filter is also proposed in which two pairs of transmission zeros may be created to improve both the selectivity and stopband rejection. The proposed fourth-order filter also has the merits of small circuit area and no spurious response up to 3 0, where 0 is the passband center frequency. To provide effective design tools, simple equivalent-circuit models are also established. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/200611150121349 | Other Identifiers: | 246246/200611150121349 |
Appears in Collections: | 電機工程學系 |
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