Microwave microcircuit

Claim 1

A microcircuit comprising a substrate of low-loss dielectric material having first and second surfaces, electrically conductive ground layer means bonded to said first surface, electrically conductive circuit means bonded to said second surface and having input circuit means for propagating high frequency energy, radial transmission line circuit means for coupling said high frequency energy to said ground layer, and output circuit means, said radial transmission line circuit means comprising a sector-shaped planar transmission line device having an apex and a radius substantially one quarter of a wave length in dimension, where wave length is substantially the median operating high frequency wave length, barrier diode frequency converter means coupled between said input circuit means and said apex of said radial transmission line circuit means, and shaped electrical conductor means adjoining said radial transmission line circuit means to said output circuit means and extending substantially above the plane of said electrically conductive circuit means for propagating converted frequency energy into said output circuit means, said shaped electrical conductor means being joined to the outer sector-shaped surface of said sector-shaped planar transmission line device substantially at a point characterized by minimum high frequency fields and having a high impedance to said high frequency electric fields, said radial transmission line circuit means and said shaped electrical conductor means forming a low pass filter against high frequency signals, permitting only frequency converted signals to pass to said output circuit means.