Title :
High power mm-wave systems for pulsed and CW ESR
Author :
Bolton, D.R. ; Robertson, D.A. ; Cruickshank, P.A.S. ; Smith, G.M.
Author_Institution :
Sch. of Phys. & Astron., Saint Andrews Univ., UK
fDate :
27 Sept.-1 Oct. 2004
Abstract :
We describe a low noise mm-wave source and coherent heterodyne detection system designed to operate at both 94 GHz and 188 GHz for both CW and pulsed ESR. The source maintains phase coherence throughout, and has intrinsic bandwidths which allows ns pulse ESR spectrometry to be performed. The multiplied source can produce +23 dBm at 94 GHz and has been designed to act as an input to a 1 kW amplifier for high power pulsed ESR. By using a DRO based signal source a 30 dB improvement in the spectrometer noise floor over a Gunn based source has been measured.
Keywords :
EPR spectrometers; dielectric resonator oscillators; heterodyne detection; millimetre wave detectors; millimetre wave oscillators; phase noise; 1 kW; 188 GHz; 94 GHz; CW ESR; DRO; ESR spectrometer; Gunn based source; coherent heterodyne detection system; high power mm-wave systems; low noise mm-wave source; phase coherence; pulsed ESR; Bandwidth; Detectors; Frequency; Leak detection; Oscillators; Paramagnetic resonance; Phase detection; Phase noise; Pulse amplifiers; Spectroscopy;
Conference_Titel :
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on
Print_ISBN :
0-7803-8490-3
DOI :
10.1109/ICIMW.2004.1421990
