Title :
Modified Parallel-Coupled Filter Structure Improves the Upper Stop-Band Performance
Author :
Itoh, Tatsuo ; Chang, Chi-Yang
Author_Institution :
Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712, U. S. A.
Abstract :
In this paper we describe a modified parallel-coupled microstrip filter structure. Using this new structure the filter upper stop-band performance is improved by at least 15 dB. The new structure uses less space than the traditional parallel-coupled filter structure first proposed by S.B. Cohn in 1958 [1]. This new structure is especially useful for filter bandwidths greater than 25%. Several examples show the performance improvement of the filters fabricated in both low dielectric constant (2.55) and high dielectric constant (10.2) substrates.
Keywords :
Active filters; Band pass filters; Bandwidth; Coupling circuits; Dielectric constant; Dielectric substrates; Frequency; High-K gate dielectrics; Microstrip filters; Resonator filters;
Conference_Titel :
Microwave Conference, 1990. 20th European
Conference_Location :
Budapest, Hungary
DOI :
10.1109/EUMA.1990.336161
