High-Q Bandpass and Band-Elimination Resistance-Capacitance Ladder Structures

In a previous paper,[1] the properties of high-
Q
resistance-capacitance (R-C) ladder structures having lowpass and highpass configurations were discussed. In this correspondence, bandpass and band-elimination structures are considered. These R-C structures are also expected to fulfill the following two conditions: 1) the factor
Q = \omega_{0}/2{\cdot}d {\phi}/dw|_{\omega = \omega \c}
,(where
\phi
is the phase shift between the input and the output, and
\omega_0
is the frequency at which
\phi =
180°) shall be a maximum possible; and 2) the open-circuit input impedance and the short-circuit output admittance shall be simultaneously maximized.