National Taiwan University Dept Elect EngnWu, Chao-HuangChao-HuangWuLin, Yo-ShenYo-ShenLinWang, Chi-HsuehChi-HsuehWangChen, Chun-HsiungChun-HsiungChen2006-11-142018-07-062006-11-142018-07-062006-02http://ntur.lib.ntu.edu.tw//handle/246246/200611150121350Novel microstrip coupled-line bandpass filters with extended rejection band are proposed using the transmission zeros inherently associated with the shortened coupled sections to suppress the odd spurious harmonics at (2 +1) ( = 1 2 . . .), where is the passband center frequency. The proposed filters feature compact size and low insertion loss, and have two crosscoupled- induced transmission zeros near the passband edges for improving the filter selectivity. To demonstrate this novel technique of shortening coupled sections, the second-order filter with the stopband extended up to 4 6 is implemented and carefully examined. To further improve the filter response, the fourth-order filter with the rejection extended up to 7 4 and better than 30 dB is also implemented.application/pdf672794 bytesapplication/pdfzh-TWBandpass filtercoupled linemicrostripstopband extensionjournal articlehttp://ntur.lib.ntu.edu.tw/bitstream/246246/200611150121350/1/1774.pdf