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An improved quarter wavelength (lambda/4 ) SIR (stepped impendence resonator) in LTCC (low temperature co-fired ceramic) is proposed. The improved SIR in LTCC can have much smaller resonant length at desired frequency and have much higher 1th spurious resonant frequency comparing to the traditional ones. Filters that are constructed by the improved SIRs can have small size and high spurious pass band...
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