Broad band microwave detector
AssigneePacific Measurements, Inc.
InventorsGary Yasumura, Robert D. Genin, Scott F. Wetenkamp
Life of this patent
Estimating the term…
Abstract
An improved broad band microwave detector of the type including a detector diode, a by-pass capacitor, and a resistive termination wherein fabrication using coplanar transmission line techniques results in a substantial increase in the frequency response of the detector.
Claims9
An improved broad-band microwave detector, having an input port, for converting microwave signals into corresponding direct current voltages, of the type having a diode, a by-pass capacitor, and a resistive termination, the improvement comprising
- coplanar transmission line means for forming the resistive termination and for supporting and interconnecting the diode and by-pass capacitor, and for receiving the microwave signal from the input port and supplying the microwave signal to the diode.
A broad-band microwave detector, having an input port and an output port, for converting microwave signals into corresponding direct current voltage levels comprising
- a sheet of dielectric material of predetermined thickness having a top surface and a bottom surface;
- a ground plane sheet of conducting material of predetermined thickness substantially covering the top surface of the dielectic, the ground plane having a slot located adjacent to an edge of the dielectric;
- a coplanar transmission line comprising a strip of conducting material, the strip of conducting material having predetermined length, width, and shape to form a resistive termination having a predetermined value when the conducting material is positioned within the slot and bonded to the dielectric material;
- a by-pass capacitor having a top and a bottom, the bottom being connected to the ground plane adjacent to the slot and the coplanar transmission line;
- a diode, having an anode and a cathode, the cathode being connected to the coplanar transmission line for receiving the microwave signal and the anode being connected to the top end of the by-pass capacitor;
- input coupling means for supplying the microwave signal from the input port to the coplanar transmission line;
- and
- output coupling means for connecting the top of the by-pass capacitor to the output port of the detector.
A broad-band microwave detector, having an input port and an output port, for converting microwave signals into corresponding direct current voltage levels, comprising
- a supporting dielectric sheet having a top surface and a bottom surface and a predetermined thickness;
- a ground plane sheet of conducting material having a predetermined thickness, the ground plane substantially covering the top surface of the dielectric sheet, and wherein the ground plane sheet has a rectangular slot centered adjacent to one edge of the dielectric;
- a T-shaped coplanar transmission line having a length which is no greater than 50 mils and a width which is no greater than 50 mils and having an approximate 50 ohm resistive terminating value when centered in the slot and bonded to the dielectric material;
- a low dielectric by-pass capacitor having a thickness of approximately 3 mils, the capacitor having a top and a bottom, the bottom being bonded to the ground plane adjacent to the rectangular slot and parallel with the coplanar transmission line;
- a crystal diode, having a high switching speed, and an anode and a cathode, wherein the anode is bonded directly to the coplanar transmission line and the cathode is bonded directly to the top of the capacitor so that the diode is positioned approximately 20 mils above the ground plane;
- input coupling means for supplying the microwave signal from the input port to the coplanar transmission line;
- and
- output coupling means for connecting the top of the capacitor to the output port.
Dependencies are inferred from the claim text.