NONLINEAR NOISE EFFECTS IN SYNCRONIZED OSCILLATORS by Klaus SchUnemann ABSTRACT: A nonlinear theory of noise in synchronized oscillators is outlined, thus extending Kurokawa's work /1/ from small to arbitrary injection levels. As a first application the output noise of synchronized oscillators is calculated for moderate injection signals. It is shown both theoretically and experimentally that th

MICROWAVE CAD IMPACT IN THE 70'S HARLAN HOWE, JR. ABSTRACT While the microwave community was not the first to discover the benefits of computeraided design, it has in the last ten years, made extensive use of this extremely powerful tool. The use of computeraided design for microwave components and subsystems spans the range from simple problems which merely require high- speed capability t

DIELECTRIC WAVEGUIDES AND WAVEGUIDE DEVICES FOR MICROWAVE APPLICATIONS V.F. Vzyatyshev. B.I. Ryabov. G.D. Rozhkov. A.N. Merkuryev* ABSTRACT A survey on the state of the art in Dielectric Waveguide (DW), stressing in particular the practical microwave applications, is given. The principles for designing DWs, fixing and joining devices, launchers, various multiport networks etc. are fo

OPTIMIZED CAVITY-BACKED SLOT ANTENNAS FOR PHASED ARRAYS Rolf O. E. Lagerlof ABSTRACT The resonance frequency of a cavity-backed slot antenna and also the Qfactor are highly dependent of the dimensions of the cavity and of the dielectric filling of the cavity. A low Q-factor is desired for wideband frequency performance. Recently, the author published the values of the dimensions of the cavity

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