Patent ID: 6891446

Claim:
A compact broadband balun comprising: a waveguide transition between one or more input ports and one or more output ports; means for isolating and/or matching said input ports and said output ports based on said transition, wherein said means for isolating and/or matching includes a load-matching resistor; a first slotline waveguide, one end of said first waveguide representing a first port of said balun; and a second slotline waveguide, opposite ends of said second waveguide representing second and third ports; wherein said waveguide transition occurs between said first waveguide and said second waveguide, said waveguide transition includes a load-matching resistor and/or a tapered waveguide section and a slotline T-junction, and said waveguide transition is shaped to provide a frequency-independent, anti-phase response in response to an input signal provided at said one or more input ports.