Patent ID: 8879662

Claim:
A device for combining analog and digital in-band-on-channel signals to feed a common antenna input comprising: a first directional coupler having a first/input port for receiving a digital input signal, a second/input port for receiving an analog input signal, a third/output port, and a fourth/output port, wherein said first directional coupler functions as a power divider; a first phase shifting allpass filter module having a first/input port electrically coupled to said third/output port of said first directional coupler, and a second/output port; a second phase shifting allpass filter module having a first/input port electrically coupled in series to said second/output port of said first phase shifting allpass filter module, and a second/output port; and a second directional coupler having a first/input port electrically coupled to said second/output port of said second phase shifting allpass filter module, and a second/input port electrically coupled to said fourth/output port of said first directional coupler, wherein said second directional coupler functions as a power combiner.