MICROWAVE FET's - WHAT's NEXT? Charles A. Liechti* ABSTRACT Over the last decade, GaAs FET's have made dramatic advances in and efficient power amplification. These advances are highlighted possible pathways for future developments are shown. Looking further ahead, it is important to the key to microwave monolithic-integrated IC's today, and where do we go from here?" briefly covered in this p



APPLICATION OF TWO GROUND-BASED MICROWAVE RADIOMETERS FOR INDIRECT DETERMINATION OF THE TEMPERATURE PROFILE OF THE ATMOSPHERIC BOUNDARY LAYER B. Schonwald ABSTRACT Angular measurements of brightness temperature in the frequency range between 50 GHz and 70 GHz reproduce information of the vertical temperature profile in the atmosphere. It will be measured with two radiometers. One works in the freq

MICROWAVE IMAGES OF SUB-SURFACE UTILITIES IN AN URBAN ENVIRONMENT P.J. Richards and A.P. Anderson ABSTRACT - The principle of identifying concealed object shapes by microwave holography has become established in recent years. An important application would be the imaging of buried cables and pipes if the problem of the high attenuation of ground and the strong surface return could be over

CAPABILITY OF A MICROWAVE ACTIVE SPECTROMETER IN THE ,5-4GHz BAND Laszlo Szabo *and GUnther Perthen ** Abstract: The purpose of this paper is to document the performance characteristics and capabilities of the radar section of a ,5-4GHz Microwave Active Spectrometer system. The system will provide ground truth data for radar remote sensing (60and its dependence on look angle and polarization)

IMPROVED MICROWAVE RADIOMETRY FOR REMOTE SENSING* A. Leber and T. Flattau** ABSTRACT Significant improvements in the gain stability and overall performance of microwave radiometers have been achieved with the use of a selfbalancing gain modulation technique. This technique, in combination with automatic thermal calibration, is particularly well suited for remote sensing radiometric applicat

A NEW TYPE OF MICROWAVE POWER LIMITER WITHOUT SPIKE LEAKAGE B. BOITTIAUX jIE',J. M. JENDRZEJCZAK jIE, G,. FORTERRE jlEjIE, J. MARCOUX jIEjIE ABSTRACT A new type of microwave power limiter without spike leakage is studied based on a very fast bulk effect in semiconductors. A numerical study of the structure is presented and expected performances of two common semiconductors are shown. Theor



WIDE BAND FREQUENCY DOUBLER D. DORSI ~ ABSTRACT Conventional frequency multipliers using step-recovery-diodes operate on narrow or moderate instantaneous bands. However, multipliers operating on bandwiths of 10 to 15% of the nominal frequency are needed in local oscillator generators for frequency agile up and down converter applications. This paper describes a microstrip frequency doubler,

PERFORMANCE AND CIRCUIT CHARASTERISTICS OF CATTS J. R. Eshbach, S. P. Yu, W. R. Cady and N. T. Lavoo ABSTRACT New results in the 3-5 GHz region, obtained on CATT cells designed for improved efficiency as microwave power amplifiers, are reported. At 3.0 GHz collector efficiencies of 39% have been measured with 12 dB gain and 1.4 watts peak output power per cell. At 5.0 GHz the results are: 2