Abstract: A miniature coaxial transmission line to waveguide transition particularly useful for frequencies beyond 40 GHz utilizes a projecting center conductor of a miniature coaxial line inserted directly into a waveguide. A metallic cylindrical sleeve is affixed to the end of the projecting center conductor to form a probe. The coaxial line is housed in the waveguide flange, and a plate is affixed across the cross section of the waveguide to provide a short circuit.

Abstract: The invention is a cross-bar signal mixer suitable for low-cost high-yield mass production. The mixer configuration consists of a balanced planar taper section supported upon a dielectric substrate placed across the carrier and local oscillator wave guides perpendicular to the direction of electromagnetic energy propagation. Beam lead mixer diodes are connected across the feed-point of the taper section. The local oscillator energy is injected in transverse electric mode relation at the junction of the two mixer diodes, thereby effectively decoupling the local oscillator from the carrier signal input. The intermediate frequency energy is abstracted from the same point as the local oscillator energy is injected and is decoupled by a low-pass filter. The local oscillator and the intermediate frequency circuits are incorporated on the same planar substrate as the carrier signal circuit and are therefore not critical in design.