Asymmetric Realizations for Dual-Mode Bandpass Filters

Superconducting Receiver Front-End and Its Application In Meteorological Radar

“…One of the fundamental methods of synthesis of generalized Chebyshev filters, based on cross-coupled resonators and proposed by Atia & Williams (Atia & Williams, 1972;Atia et al, 1974), is still commonly used. Alternative synthesis techniques were also advanced by many scientists (Cameron & Rhodes, 1981;Chambers & Rhodes, 1983;Levy, 1995;and Cameron, 1999). The first step of design a generalized Chebyshev filter is to determine all the positions of the transmission zeros and reflection zeros of the filter that satisfy the specifications.…”

“…It can be proved (Cameron & Rhodes, 1981) (Cameron, 1999;Amari, 2000;and Macchiarella, 2002). Then the reflection zreos and poles of the filter may be found Knowing all the positions of the zeros and poles, the next step of filter synthesis is to choose an appropriate topology of the coupled resonators and to synthesis the coupling matrix.…”

Design of microwave filters with arbitrary responses

“…The S zeros may 11 be located in any pattern allowed by the realizability constraints given above. When nonadja-Ž .…”

“…S zeros on the j 21 omega axis close to the passband provide improved selectivity, and complex S zeros can 21 provide delay equalization. Complex S zeros 11 can provide an almost constant reflection ampli-Ž tude in the passband e.g., for special directional . filter applications or a slowly varying amplitude Ž .…”

“…low-pass filters . For an equiripple passband response, the S zeros are uniquely determined by 11 the S zeros and the band edge frequencies and 21 cannot be set independently, but they can be w x computed in a straightforward manner 1᎐3 .…”