MICROWAVE ABSORPTION OF LIVING HUMAN SKIN BETWEEN 8 AND 96 GHZ Jochen Edrich* ABSTRACT For the study of mm wave thermography and hazards the absorption characteristics of living human skin are determined between 8 and 95 GHz by placing the skin against a thin dielectric film suspended across a rectangular horn and measuring its return loss. The resulting absorption curve increases from 75%

MICROWAVE BIOEFFECTS. CURRENT STATUS AND CONCEPTS Przemyslaw CZERSKf/ and Stanislaw SZMIGIELSKra/ ~ ABSTRACT. The information on microwave bioeffects /MWBE/ is derived from animal experimentation, model studies and epidemiological research on the health status of persons exposed occupationally to MW'. The analysis of MWBE requires the consideration of a chain of events: biophysical mechani



DOPPLER SPEED SENSORS FOR AUTOMOTIVE APPLICATIONS R Ross and M J Howes ABSTRACT . The problem of wheel and vehicle speed measurements in automotive antiskid systems is discussed and a microwave doppler radar solution proposed. A straightforward design approach for self-mixing Gunn device radar detectors using a new current waveform approximation is presented allowing simple observation of the ef

SICARID.TCl RAILWAY A lEV NICROWAVE SYSTEN FOR THE TRANSFER OF IIFORNATIORS FROM THE TRACK TO THE VAGON II NETWORKS F. Becker and W. Meneolia ABSTRACT The transfer of information in all systems for automatic Systems with intermittent from the railway train ctntrol. network to passing locomotivesis a very important factor transfer of information from points to the locomotives offer in additio

DETECTION OF OBSTACLES ON RAILWAY LEVEL-CROSSINGS Bernard Thourel ABSTRACT The detection of obstacles on railway level-crossings is usually ensured by small radars utilizing gunn diodes or similar devices. This process is not quite safe however and it may happen that a vehicle at standstill on the railway track cannot be detected. We are studying surface wave propagation, guided by the rails usi

APPLICATION OF MICROWAVES OF RAILROAD Eikichi TO THE SAFETY CROSSINGS SYSTEM Yamashita ABSTRACT A new system to prevent collision accidents between cars and trains on railroad crossings is described in which microwave radiation from Gunn-diode oscillators are used to recognize obstacles. Experimental results are reported. 

PERFORMANCE OF THE MADGE AIRCRAFT GUIDANCE SYSTEM R.N. Alcock, * P. England, + R.P. V~ncent . * ABSTRACT MADGE (Microwave Aircraft Digital Guidance Equipment) is a portable equipment which assists the landing of all types of aircraft at a variety of sites. It contains a digital data link operating at 5 GHz. Distance is derived in the air by measuring go-and-return time; angles are mea

A COOLED GaAs MESFET AMPLIFIER OPERATING AT 12 GHz WITH 1.6 dB NOISE FIGURE C. A. Liechti, R. B. Larrick and D. J. Mellor ABSTRACT The performance of a three-stage GaAs MESFET amplifier 11.7 to 12.2 GHz U.S. satellite communication band is 40ºK and 300ºK. At room temperature, the noise and the gain is 18 dB. By cooling to 40ºK, the noise 1.6 dB (Te=130ºK) while the gain increases to 31 opera

BROADBAND LUMPED ELEMENT X-BAND GaAS FET AMPLIFIERS R. S. Pengelly ABSTRACT * The GaAs FET is increasing in use as a high frequency, low noise amplifier. This paper presents work directed to extending the bandwidth and repeatability of X-band FET amplifiers by the use of lumped element techniques. Such lumped element microwave circuits offer a considerable size saving when compared to microstri