Marki Microwave surface mount high-isolation power combiners are based on a bridge coupler circuit built around a Marki balun, delivering high port-to-port isolation, broadband 50 � match, and tight amplitude and phase balance between inputs. The high isolation prevents interaction between input signals before combining, making them ideal for combining uncorrelated tones in IP2 and IP3 measurement, two-tone amplifier linearity testing, and receiver stress testing.