標題: Wideband bandpass filter design with three-line microstrip structures
作者: Kuo, JT
Shih, E
電信工程研究所
Institute of Communications Engineering
公開日期: 1-十月-2002
摘要: A systematic procedure is described for designing wideband bandpass filters based on parallel coupled three-fine microstrip structures. It starts with modal analysis of a three-line coupled microstrip circuit. A database of modal eigenvoltage coefficients and modal characteristic impedances for a specified value of substrate e, is established. The relation between the circuit parameters of a three-fine coupling section and an admittance inverter circuit is derived, so that the filters can be synthesised by a standard procedure. As compared with traditional parallel coupled lines, the proposed three-line design has the following two important features for the design of wideband filters: the tight line spacings of end stages can be greatly relaxed; and the stopband rejections are improved. Four filters with fractional bandwidths from 40% to 70% are fabricated on substrates with low and high dielectric constants. Prediction and measurement results are in good agreement.
URI: http://dx.doi.org/10.1049/ip-map:20020572
http://hdl.handle.net/11536/28488
ISSN: 1350-2417
DOI: 10.1049/ip-map:20020572
期刊: IEE PROCEEDINGS-MICROWAVES ANTENNAS AND PROPAGATION
Volume: 149
Issue: 5-6
起始頁: 243
結束頁: 247
顯示於類別:期刊論文