PHASE COHERED OPTICALLY INJECTION COMMUNICATION PHASED ARRAYS AS Daryoush+, ABSTRACT M Francisco*, R Saedi +, D Polifko + LOCKED OSCILLATORS FOR The indirect subharmonic optical injection locking is a powerful technique to synchronize oscillators up to millimeter wave frequencies, however they suffer from phase inaccuracy over the locking range, first formulated by Adler. This paper presents a

INTERFERENCE-RELATED BISTATIC-HYDROMETEOR +) H. Schmiedel STUDIES SCATTER *) OF SLANT-PATH ATTENUATION AND and F.Rlicker 1 ABSTRACT Co-channel interference may be caused by bistatic scattering of electromagnetic waves from hydrometeors. The degradation of a wanted signal on a slant-path link due to interference depends on the signal-to~interference ratio, and thus also on the concurrent atte

ON THE ACCURACY OF RADIOWAVE PROPAGATION MEASUREMENTS P.H.G. van de Berg, G. Brussaard, and J. Dijk1 ABSTRACT Propagation models are mainly based on data obtained from propagation measurements. In propagation measurements accuracy of the obtained data is often overlooked, as these measurements are very complex to perform. This paper considers the accuracy of propagation measurements in practic

RESULTS OF OLYMPUS 20 AND 30 GHZ BEACON MEASUREMENTS J R Larsen* ABSTRACT Results of concurrent 20 and 30 GHz measurements with radiometers and beacon receivers using 4 separate antennas are presented. Clear cases of ice-depolarisation and variations in scaling of attenuation have been found in the unusual climate of the winter 1989/90. 

BELGIAN OLYMPUS EXPERIMENT, AND FIRST RESULTS A. Vander Vorst, D. Vanhoenacker, J .M. Maes, J. De N olf2 ABSTRACT The Microwaves Laboratory of the C. Vyncke, J. Matagne,! University of Louvain"la-Neuve has a research program in the atmospheric microwave propagation have two Olympus earth"stations built funded by Scientific Policy of the two stations is presented in this since about

OLYHPUS AND RADAR: A SITE DIVERSITY KEASUREHER'! SETUP IN THE NETllElUANDS L.R. Nieuwkerk * , L.P. Ligthart * ABSTRACT Satellite communications affected by rain. In order site diversity measurement using the 20 and 30 GHz bands are strongly to study the problem of link deterioration, a setup has been built in the vicinity of Delft, the Netherlands consisting of 12/30 GHz beacon statio

OPEX - A NEW ERA OF SATELLITE PROPAGATION RESEARCH B Arbesser-Rastburg * ABSTRACT When ESA's latest telecommunications satellite OLYMPUS was launched in summer of 1989 it carried a payload producing three unmodulated beacons at 12.5, 19.8 and 29.7 GHz. The main purpose of these beacons is to enable scientists to carry out long term slant path propagation experiments at these frequencies. The

Small Signal Measurements of the Microwave Impedance of QWITT Diodes A. Mortazawi, D. Miller, D.P. Neikirk and T. Itoh* ABSTRACf This paper presents a comparison between experimental and calculated small signal microwave impedance for several quantum well injection transit time (QWITT) diodes. The measured results are in good agreement with the calculations based on a simple physical device m

A 1 TO 20 GHz MICROWAVE SAMPLER K Madani., C S Aitchison.. ABSTRACT The 1 to 20 GHz sampler circuit described in this paper has many novel features, including a new wide band microstrip/slotline balun and a wide band active isolator to reduce LO to RF leakage. The signal to noise ratio over the RF bandwidth is greater than 20 dB with an input power level of -32 dBm, which is measured in an IF

CATHODECONTACTEFFECTS IN MILLIMETER-WAVE GaAs TRANSFERRED ELECTRONDEVICES H.Spooner, M.J.Howes, C.M.Snowden* ABSTRACT Millimetre-wave transferred electron devices have been fabricated with a range of cathode contacts from a Schottky contact to an ohmic contact. DC measurements have shown that the degree of negative differential resistance and the ratio of forward and reverse bias threshold curren