X-BAND LOW PHASE NOISE GUNN DIODE OSCILLATOR FOR EPR SPECTROSCOPY

被引：8
|
作者：
OLES, T
STRANGEWAY, RA
LUGLIO, J
FRONCISZ, W
HYDE, JS
机构：
[1] MED COLL WISCONSIN,NATL BIOMED ESR CTR,DEPT RADIOL,MILWAUKEE,WI 53226
[2] MILWAUKEE SCH ENGN,MILWAUKEE,WI 53202
来源：
REVIEW OF SCIENTIFIC INSTRUMENTS | 1992年 / 63卷 / 08期
关键词：
D O I：
10.1063/1.1143257
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Two low phase-noise Gunn diode X-band oscillators intended for use in electron paramagnetic resonance (EPR) spectroscopy are described. In the first, a 250-mW MA49159 Gunn diode oscillator (M/A-COM, Burlington, MA) is mounted in a coaxial transmission line that is closely coupled to a TE011 transmission cavity that in turn is loosely coupled to the output transmission line. The output power is 50 mW and the phase noise is -145 dBc/Hz at 100 kHz offset. In the second, two such coaxial assemblies are used with 500-mW MA49110 diodes for increased power. The output power is 150 mW and the phase noise is -150 dBc/Hz at 100-kHz offset. These phase noise values are in the range of 24-29 dB better than the specification for a normal high quality klystron used in commercial spectrometers.
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页码：4010 / 4011
页数：2
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