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Narrow‐band stripline filters with transmission zeros at finite frequencies
Author(s) -
Jokela Kari
Publication year - 1979
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.4490070409
Subject(s) - susceptance , stripline , band pass filter , microstrip , transmission line , resonator , reactance , electronic engineering , wideband , equivalent circuit , topology (electrical circuits) , mathematics , electrical impedance , engineering , electrical engineering , voltage
A design method is described to realize narrow‐band stripline or microstrip bandpass filters having one transmission zero near to the upper and lower bandedge. The filters utilize capacitively coupled open half‐wave TEM‐line resonators. Two nonadjacent resonators are also inductively coupled. No short circuits are needed. The design is based on the approximate or exact synthesis of the lowpass protoype presented by Levy. The transmission line parameters are obtained easily from the design formulae which have been derived using the susceptance (or reactance) slope parameter technique. The filter performance is good up to 12 per cent bandwidth. Measured results show good agreement with the theoretical ones.