Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters

@article{citeulike:2782029, abstract = {This paper presents a new compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filter. A bandstop filter is introduced that uses a ring resonator with direct-connected orthogonal feed lines. A new bandpass filter based on the bandstop filter uses two tuning stubs to construct a wide-band passband with two sharp stopbands. Without coupling gaps between feed lines and rings, there are no mismatch and radiation losses between them and, therefore, the new filters show low insertion loss. In addition, a dual-mode characteristic is used to increase the stopband bandwidth of the new filters. A simple transmission-line model used to calculate the frequency responses of the filters shows good agreement with measurements. The filter using three cascaded rings has 3-dB fractional bandwidth of 49.3\%, an insertion loss of better than 1.6 dB in the passband, a return loss of larger than 13 dB from 4.58 to 7.3 GHz, and two rejections of greater than 40 dB within 2.75-4.02 and 7.73-9.08 GHz. The high-performance, compact-size, and low-cost filter was designed for reducing the interference in full duplex systems in satellite communications.}, author = {Hsieh, Lung-Hwa and Chang, Kai }, booktitle = {Microwave Theory and Techniques, IEEE Transactions on}, citeulike-article-id = {2782029}, doi = {10.1109/TMTT.2003.809643}, journal = {Microwave Theory and Techniques, IEEE Transactions on}, keywords = {bandpass, compact, filter, loss, low, microstrip}, number = {4}, pages = {1241--1246}, posted-at = {2008-05-10 00:52:51}, priority = {2}, title = {Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters}, url = {http://dx.doi.org/10.1109/TMTT.2003.809643}, volume = {51}, year = {2003} }

TY - JOUR ID - citeulike:2782029 TI - Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters T2 - Microwave Theory and Techniques, IEEE Transactions on JF - Microwave Theory and Techniques, IEEE Transactions on VL - 51 IS - 4 SP - 1241 EP - 1246 N2 - This paper presents a new compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filter. A bandstop filter is introduced that uses a ring resonator with direct-connected orthogonal feed lines. A new bandpass filter based on the bandstop filter uses two tuning stubs to construct a wide-band passband with two sharp stopbands. Without coupling gaps between feed lines and rings, there are no mismatch and radiation losses between them and, therefore, the new filters show low insertion loss. In addition, a dual-mode characteristic is used to increase the stopband bandwidth of the new filters. A simple transmission-line model used to calculate the frequency responses of the filters shows good agreement with measurements. The filter using three cascaded rings has 3-dB fractional bandwidth of 49.3%, an insertion loss of better than 1.6 dB in the passband, a return loss of larger than 13 dB from 4.58 to 7.3 GHz, and two rejections of greater than 40 dB within 2.75-4.02 and 7.73-9.08 GHz. The high-performance, compact-size, and low-cost filter was designed for reducing the interference in full duplex systems in satellite communications. KW - bandpass KW - compact KW - filter KW - loss KW - low KW - microstrip AU - Hsieh, Lung-Hwa AU - Chang, Kai PY - 2003/// UR - http://dx.doi.org/10.1109/TMTT.2003.809643 ER -