A MATRIX FEED SYSTEM FOR A CYLINDRICAL ANTENNA ARRAY J. Reindel ABSTRACT The cylindrical matrix is a reciprocal corporate microwave network connected between a selector switch and an antenna ring array. The matrix divides and controls the amplitude and phase of the input power and feeds it to a sector of the array. The active array sector forms a highly directive beam normal to the array sector.

RADIATION PROPERTIES OF SPHERICAL ARRAYS Jorma Juntunen 1. ABSTRACT The array formed by elements placed on the surface of a sphere is studied by means of numerical calculations. The elements are assumed to be ideal and the mutual couplings can thus be neglected. By using a uniform element distribution and an active region moving with the main beam, the radiation properties can be kept unch

SUPERDIRECTIVITY ELEMENTS FED WITH APPRECIABLE BANDWIDTH IN ARRAYS OF RADIATING BY MICROWAVE TRANSISTORS M.M. Dawoud and A.P. Anderson ABSTRACT - The incorporation of transistors into the radiating elements of an array antenna leads to a suppression of the elemental mutual coupling effects in the feed network. Because of this suppressed interaction, it is possible to re-appraise the prac

ACTIVE ANTENNA ARRAYS USING PHASE INTERPOLATION LOCKING J.R. Forrest, A.L. Cullen, and A. Darbandi ABSTRACT A severe constraint on the use of electronically scanned active phased arrays is the high cost per element. This paper describes a method of r.f. phase interpolation locking applicable to transmit arrays where each element would normally have its own r.f. source and phase shifter. In

MUTUAL COUPLING EFFECTS IN THINNED ANTENNA ARRAYS E. Ludwig and G. Ries* ABSTRACT effects is one interesting advantage of thinned antennas for phased array systems. This paper deals with the reflection coefficients and the antenna gain both as functions of the degree of thinning in statistically highlythinned arrays. Appropriate statistics are derived, discussed, and experimentally tested.

A SPECIAL ECONOMIC DESIGN OF SYSTEM AND COMPONENTS ENABLES A MORE PHASED-ARRAY ANTENNA + ) Gerhard lIi.ischelrath ABSTRACT The research results of the experimental phased array transmitting antenna (ELAN 25) are discussed. The main point of view besides the radar-technical one has been the search for a more economic system configuration. To install a minimum of RF-power and to relax the

40 WATT 16 GHz pumED GUNN DIODE OSCILLATOR Stevens, R., Tarrant, D., ~ers, F.A. ABSTRACT Very high peak power levels at microwave frequencies can be generated from several semiconductor devices (Gunn diodes, L.S.A. mode devices, TRAPATT's etc.) but some of these devices are only little removed from laboratory devices, and are limited in frequency. The Gunn device is the most practical and

GUNN AND IMPATT AMPLIFIERS FOR COMMUNICATIONS SYSTEMS H. C. Bowers ABSTRACT This paper discusses the use of negative resistance Gunn and IMPATT diodes in amplifier circuits. The operation of these diodes, their characteristics, design of circuits using them, and performance of these circuits is presented. The performance characteristics of these amplifiers pertinent to their use in frequency an



STABLE AMPLIFICATION AND HIGH CURRENT DROP GaAs Tills BISTABLE SWITCHING IN SUPERCRITICAL S.H. Izadpanah*, B. Jeppsson**, P. Jeppesen*** and P. Js6ndrup*** ABSTRACT Bistable switching with current drops of 40% and switching ps are obtained in pulsed operation of 10µm supercritically GaAs Transferred Electron Devices (TEDs). When CW-operated vices exhibit a 5-17 GHz bandwidth for the stable