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In this paper, a method is proposed to extract the parameters of direct-coupled-resonator filters such as the resonant frequencies, coupling coefficients, and Q factors. The ABCD matrix is firstly built from the simulation or measured response. The components of the filter in each stage can then be decomposed based on the derived functions. Since lossy components can be individually extracted, this...
Two coupled lines with different spacing can be combined as a new configuration with folded corners. In a two-stage half-wavelength resonators filter, the couplings using this configuration can be controlled to provide the required coupling for the fundamental passband, and a transmission zero at the second spurious harmonic frequency. This configuration is then further extended as a four-stage cross-coupled...
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