Coupling-compensated 180° phase shift coupled-Line filters terminated in arbitrary impedances
Yokohama(2006)
摘要
Coupled-line filters (CLFs) with a 180deg phase shift are analyzed and coupling compensated design equations are derived. They can be applied for arbitrary termination impedances and arbitrary coupling coefficients. To verify the design equations reasonable, a microstrip CLF with a coupling coefficient of -7 dB is fabricated on a substrate (epsivr = 3.5 ,H = 30 mil, tan delta = 0.04) and tested for 100 Omega and 70 Omega termination impedances. The measured results show good agreement with the simulated ones.
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关键词
coupled transmission lines,microstrip filters,arbitrary termination impedances,coupling-compensated phase shift coupled-line filters,microstrip clf,baluns,coupled-line filters,impedance transformers with a 180° phase shift,ring hybrids,phase shift
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