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Monolithic single and double sideband mixer apparatus

  • US 4,553,265 A
  • Filed: 12/08/1983
  • Issued: 11/12/1985
  • Est. Priority Date: 12/08/1983
  • Status: Expired due to Fees
First Claim
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1. A monolithic mixer apparatus comprising in combination:

  • a dielectric substrate mounted in a rectangular waveguide having a broad wall and a narrow wall, said dielectric substrate having a top and bottom surface, said dielectric substrate including a ground plane on said top surface, said dielectric substrate having a predetermined length, width, thickness, and dielectric constant, said length being slightly less than the dimension of the broad wall of said rectangular waveguide, said width being slightly less than the dimension of the narrow wall of said waveguide,a slot coupler means formed on the top surface of said dielectric substrate,a coplanar transmission line means disposed on said top surface of said dielectric substrate, said coplanar transmission line means being electrically connected to said slot coupler means,a Schottky-barrier diode located on said top surface of said dielectric substrate, said Schottky-barrier diode having an anode and a cathode, said anode of said Schottky-barrier diode being connected by said coplanar transmission line to said slot coupler means,a bypass capacitor located on said top surface of said dielectric substrate, one plate of said bypass capacitor being electrically connected to the cathode of said Schottky-barrier diode, the other plate of said bypass capacitor being electrically connected to a portion of said ground plane, and,a bonding pad attached to said first capacitor plate to provide an IF signal output terminal, an RF signal and a local oscillator signal being applied to said dielectric substrate, said dielectric substrate establishing a dielectric surface wave resonance upon receipt of said RF signal and said local oscillator signal, said dielectric surface wave resonance propagating within and along the top surface of said dielectric substrate, said RF signal and said local oscillator signal propagating through said dielectric substrate to said slot coupler means, said slot coupler means being adjusted in position with respect to the centerline of the width of said dielectric substrate, said slot coupler means thereby utilizing said dielectric surface wave resonance to provide a reactive image termination at the upper sideband of said RF signal, said slot coupler means coupling said RF signal and said local oscillator signal through said coplanar transmission line means to said Schottky-barrier diode, an IF signal appearing in response to said RF and local oscillator signal at said IF signal output terminal.

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