Microwave receiver converters having a hybrid waveguide structure

Abstract

A microwave receiver converter apparatus of a balanced mixer type utilizes a hybrid waveguide having a parallelopiped construction having one side, which is open, adapted to receive a radio frequency (RF) input and provided with a susceptance device, a second side, orthogonal to the first side, adapted to provide an intermediate frequency (IF) output, and a third side, opposite to the second side, having an opening in which is disposed a cylindrical element and adapted to be coupled to a local oscillator (LO). A pair of diodes is coaxially mounted in the waveguide in a spaced apart relationship by means of connecting elements supported on an insulation block through which passes the IF output which is coupled to first ends of the diodes through a pair of helical inductance elements L. The other ends of the diodes are connected to ground via a reactance X. The susceptance device is placed in the RF line at a distance 1.sub.1 from the diodes and comprises a pair of cylindrical elements, threadedly engaged with the waveguide to permit spatial adjustment between the oppositely located free ends of the elements. The free ends are provided with off-center projections so that, upon the rotation of the elements, the distance between the projections and the diodes can be adjusted. This adjustability permits different types of diodes to be used in the apparatus.

Dependencies are inferred from the claim text.