Design of Millimeter-wave Detector for Gyrotron Power Monitoring

TL;DR

This paper presents the design and simulation of a D-band wideband Schottky diode detector for real-time gyrotron power monitoring, featuring a novel waveguide-to-microstrip transition and matching circuit.

Contribution

It introduces a new waveguide-to-microstrip transition and a wideband matching circuit for improved gyrotron power detection at 140 GHz.

Findings

Detection sensitivity of 1600V/W at -30dBm input power

Successful simulation of the detector's performance

Innovative waveguide-to-microstrip transition design

Abstract

The real-time power monitoring of gyrotron is one of the key issues in the operation of electron cyclotron resonance heating system. The detector can be used for real-time power monitoring. We analyzed the principle of diode detection and designed a D-band wideband detector based on Schottky diode in this paper. The detector includes a waveguide-to-microstrip transition, a matching circuit, a diode, and a low pass filter. A novel waveguide-to-microstrip transition was developed based on probe coupling. A wideband lossy matching circuit was developed based on tapered-line and series matching resistor. The simulation results show that when the input power is -30dBm at 140 GHz, the detection sensitivity is about 1600V/W.