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A cryogenically coolable microwave limiter

Rinard1, Quine, Eaton

  • 1Department of Engineering, University of Denver, Denver, Colorado, 80208, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 13, 1999
PubMed
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A novel microwave limiter using a GaAs PIN diode effectively reduced high-power microwave pulses for sensitive electron paramagnetic resonance (EPR) spectroscopy. This protects critical low-noise amplifiers in demanding cryogenic environments.

Area of Science:

  • Cryogenic Engineering
  • Microwave Engineering
  • Solid-State Physics

Background:

  • High-power microwave pulses can damage sensitive preamplifiers in spectroscopic instruments.
  • Electron paramagnetic resonance (EPR) spectroscopy often requires protection for low-noise amplifiers during pulsed operation.

Purpose of the Study:

  • To develop and implement a microwave limiter for protecting a low-noise preamplifier in a pulsed EPR spectrometer.
  • To assess the performance of the limiter at cryogenic temperatures.

Main Methods:

  • A microwave limiter was constructed using a Gallium Arsenide (GaAs) PIN diode and a microstrip impedance transformation circuit.
  • The limiter was tested with 300-ns long, 11-W microwave pulses at approximately 4.2 K.

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Main Results:

  • The GaAs PIN diode limiter successfully reduced 11-W microwave pulses to 70 mW.
  • The limiter operated effectively at a cryogenic temperature of approximately 4.2 K.

Conclusions:

  • The developed microwave limiter is effective in protecting sensitive instrumentation from high-power pulses.
  • This technology is suitable for integration into pulsed EPR spectrometers operating at cryogenic temperatures.