Patent ID: 7830224
Filing Date: 2010-11-09
Classification: H01P

Abstract:
1. A four-port circuit for processing two incoming signals of arbitrary phase and amplitude to output two corresponding output signals, comprising: a first input port and a second input port for receiving respective first and second incoming signals of arbitrary phase and amplitude; a first output port and second output port at which first and second output signals are provided; first and second quarter-wavelength microstrip line segments connected to a junction node and in series between the first input port and the first output port; third and fourth quarter-wavelength microstrip line segments connected to the junction node and in series between the second input port and the first output port; a fifth quarter-wavelength microstrip line segments connected to the second output port; and a slotline having a first and second end terminated with slotline stepped circular ring (SCR) so that the input signals are combined at the junction node when the first and second incoming signals are out-of-phase, and wherein the first and second incoming signals are combined at the first output port when the first and second incoming signals are in-phase.