(57) A space-efficient broadband balun (20") comprising first mechanism (94, 96) for receiving
an input signal (52, 54) having an undesirable component, wherein the undesirable
component is a common mode component, said first mechanism (94, 96) comprising first
(94) and second (96) coaxial waveguides; second mechanism (50, 78, 98) for rejecting
the undesirable component via a waveguide transition (50, 78 98), wherein the waveguide
transition (98) includes a dual coax-to-coplanar waveguide-to-single coax transition
(98), wherein the coplanar waveguide is formed from a first slotline (114) and a second
slotline (116), the first slotline (114) being formed between an outer conductor (122)
and a center conductor (118) of an output coaxial cable (120) and between an outer
conductor (110) and an inner conductor (112) of the first coaxial waveguide (94),
and the second slotline being formed between an outer conductor (122) and a center
conductor (118) of the output coaxial cable (120) and between the outer conductor
(110) and the inner conductor (112) of the second coaxial waveguide (96), and the
waveguide transition (98) includes a resistor network (100) to facilitate load matching;
wherein an end of the coaxial output cable (120) provides an output of the balun (20),
and the input signal (52, 54) includes a first input signal (52) and a second input
signal (54), which are input at ends of the first (94) and second (96) coaxial waveguides
the first input signal (52) and the second input signal (54) having a desired differential
mode component and an undesired common mode component.
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