MONOPULSE ANTENNAS WITH DOUBLY CURVED REFLECTORS Anton Brunner and Erwin Kress ABSTRACT Doubly curved reflector antennas produce different crosspolarization components in the different directions of elevation because of the reflector's curvature. In an one-plane monopulse system often used in the secondary radar case the cross-polarized components fill up the central null in the difference pat

ONE-HYBRID-MODE FEED WITH HIGH APERTURE EFFICIENCY AND LOW SPILL-OVER V.J. Vokurka A new class of one-hybrid-mode primary focus feed with high aperture efficiency and low spill-over is described. These antennas are suitable for use in deep parabolic reflectors (F/D<0.35). The propagation characteristics in the horn and far field radiation pattern are derived. The antenna efficiency and spill-o

OPTIMIZATION OF RELEVANT PARAMETERS OF ANTENNAS WITH SURFACE AND FIELD IRREGULARITIES Giovanni d'Auria, Stefano Marini, and Domenico Solimini ABSTRACT The paper parameters and tenna cess kind the the and of the incoming is considered. involved. of study ratio latter /n The are presents field The antenna discussed. a numerical the random into procedure account. to optimize A circular

ON THE EVALUATION ANTENNAS OF IMAGE REGION FIELDS FOR DUAL REFLECTOR SCANNING B. Claydon and G.L. James ABSTRACT Evaluation of the field from dual reflector scanning antennas using the physical optics approximation is impractical when the main reflector is large. Asymptotically evaluating the physical optics integral yields the geometrical optics field as the first term in the solution.

PUMP NOISE COUPLING IN PARAMETRIC AMPLIFIERS M Dean and J Clarke * ABSTRACT A simple theory for predicting the effects of pump noise on the performance of parametric amplifiers has been developed and verified. It is shown that AM noise on the pump injects both FM and AM noise on the signal magnified by approximately the amplifier gain. It is also shown that FM noise on the pump can yield bo

POWER SATURATION MECHANISMS IN IMPATTS P.A. BLAKEY * Abstract A computer simulation investigate Computed gallium arsenide X-band structures: the degree of agreement obtained is taken as support for the diode model. The relative importance of various contributory saturation mechanisms are then isolated and discussed of the operation of IMPATT diodes has been used to the factors which limit th

PARASITIC OSCILLATIONS IN IMPATT-DIODE OSCILLATORS J.J.Goedbloed and H.Tjassens ABSTRACT. Atheory is presented for the investigation of parasitic oscillations in IMPATT-diode oscillators. The theoretically predicted behaviour is found to be in good agreement with experimental results. Examples are given of how the onset of parasitic oscillations can be avoided or can be shifted towards highe



PHASE TRANSIENTS OF INJECTION LOCKED GUNN OSCILLATORS FOR MICROWAVE PULSE COMMUNICATIONe PAVLIDIS, Dc, HARTNAGEL, He and TOMIZAWA, Ko ABSTRACT Using specially selected phase-locking systems, the phase transients of Gunn oscillators have been studied with the help of Lissajous figures on a fast sampling oscilloscope. The results show that phase transients can exhibit a complex oscillatory behaviou

DYNAMIC BEHAVIOUR OF STABLE AND INJECTION-LOCKED IMPATT DIODE AMPLIFIERS FOR PSK MICROWAVE COMMUNICATION SYSTEMS R.Blix and H.J.Thaler ABSTRACT: The transient behaviour of stable and injection-locked IMPATT diode microwave amplifiers driven by phase shift keyed signals is investigated. Experimental results obtained with the aid of a fast real time microwave correlator system and bit error rate me