Patent ID: 9705467
Date: 2017-07-11
CPC Classifications: H03H

Claim:
1. A reflectionless electronic filter comprising: a symmetric two-port circuit, wherein the symmetry defines an even-mode equivalent circuit and an odd-mode equivalent circuit when the ports are driven in-phase and 180° out-of-phase, respectively; at least one lossless element and at least one complex impedance-matched internal sub-network arranged within the symmetric two-port circuit such that: wherein each complex impedance-matched internal sub-network is situated within a stop-band signal path of the reflectionless electronic filter; and wherein each complex impedance-matched internal sub-network provides an impedance-matched termination at all frequencies to the stop-band signal path of the reflectionless electronic filter; wherein at least one complex impedance-matched internal sub-network has frequency-dependent amplitude and phase response; and wherein at least one complex impedance-matched internal sub-network has at least one internal node in addition to the port nodes and the nodes in series with the ports or ground nodes of the sub-network.