Patent ID: 8154362

Claim:
An apparatus comprising: a first bi-directional constant impedance filter, wherein the bi-directional constant impedance filter comprises: a first port coupled to one of a source or a load having a first impedance, wherein the first port is configured to constantly present the first impedance to a signal received at the first port for a plurality of frequencies; and a second port coupled to the other of the source or the load having the first impedance, wherein the second port is configured to constantly present the first impedance to a signal received at the second port for a plurality of frequencies; and a second bi-directional constant impedance filter coupled in series with the first bi-directional constant impedance filter to form a filter structure, wherein the first and second bi-directional constant impedance filters are non-interacting and wherein the filter structure presents the first impedance to a signal received at an input and at an output.