A CLUSTER R.F. PRIMARY FEED FOR AN ELLIPTICAL PATTERN ANTENNA REQUIRING SENSING D.A.HAWTHORNE, A.G.MARTIN, P.C.WILCOCKSON* M.G. CHRISTIE, ABSTRACT Measured results for a ten feed cluster of small cylindrical horns using circular polarisation are presented and discussed. The application is aimed at the design of a highly elliptical beam meeting the WARC requirements for sidelobe and cross-

"..dCTRIC CON~~"IJ).'OR BROADBANDLOW CROSSPOLARISATION APPLICATIONS P. J. B. C.lat:ricQa~s* .~ ABSTRACT The paper describes the crosspolar radiation characteristics of dielectric cone feeds. It is shown that they have a potential of much broader bandwidths than the corrugated horns. However, to achieve this potential it is necessary to reduce the crosspolar radiation from the launcher and novel

A DIELECTRIC RESONATOR ELLIPTIC BAND-PASS FILTER A.Abramowicz, M.Pospieszalski ABSTRACT The feasibility of using dielectric resonators excited in TEOIA mode in a construction of a narrow-band, band-pass filters having transfer function of the elliptic type is demonstrated for the first time. The process of synthesis of the filter, its electrical and mechanical design is described. . It is i

INTERDIGITAL MULTIPLE COUPLED MICROSTRIP DC BLOCKS V K Tripathi*, Y K Chin+ and H Lee+ ABSTRACT The analysis, design procedure and experimental results for open circuited, interdigital multiple coupled microstrip I ine structures for appl ications as wide band DC blocks are presented. As in the case with other microstrip structures, the initial design procedure is formulated by assuming T

BROADBAND PLANAR COPLANAR WAVEGUIDE-SLOTLINE TRANSITION Victor FOUAD HANNA* and Louis RAMBOZ* ABSTRACT A planar two-stub coplanar waveguide-slotline transition is ana lysed using equivalent circuit approach and is designed by optimizing the slotline and the stub lengths. The end reactances for the two stubs are evaluated and cancelled separately under maximum power transfer conditions. Exp

BROPDBAND CHARACTERISATION OF COAXIAL TO MICROSTRIP TRANSITIONS S.E. Gourley, A.G. Chapman ABSTRACT The purpose of this work is to characterise launcher to There are to micros trip launchers commerinvestigation was the wedge a coaxial microstrip transition over a broadband width [2.0 ~ 12.4 GHz]. types of S.M.A. coaxial the one chosen for this shaped launcher 244-4A manufactured by 'Omni-

A MULTI-OCTAVE MATCHED QUARTERWAVE MICROSTRIP TAPER F.C. de RONDE* ABSTRACT For impedance matching, quarterwave transformers as well as tapers are in use. The first one is most popular: for a 2 : 1 impedance ratio, its reflection does not exceed 20 per cent over an octave-wide frequency band. Although usually much longer, tapers are mainly used if low reflection over multi-octave bands is ne

MICROWAVE HARDENING OF FREE-FALLING RADIOACTIVE DROPLETS + , P.Leichter + , G.Magerl * and L.Rohrecker E.Bonek * , K.Knotik § ABSTRACT We describe the design and generation of a microwave system in which liquid droplets of radioactive solutions are solidified during free fall. Upon passage through a vertically positioned H10p resonant cavity, the droplets are heated within 0.25 sec to 1000C

A SPATIAL FILTERING TECHNIQUE FOR MICROWAVE DISTANCE MEASUREMENTS OLAF OSTWALD and BURKHARD SCHIEK ABSTRACT Accurate distance measurements for industrial applications can be performed with FMCW systems which use a nonlinear sweep and the phase measuring technique. These systems only work accurately, if multiple echoes are excluded. The measurement accuracy is disturbed in complex enviro

MICROWAVE AUTOMATIC METHODS FOR STRENGTH EDGING OF BOARDS GRADING OF TIMBER AND FOR S. Heikkila*, ABSTRACT P. Jakkula* and M. Tiuri** Microwave methods have been succesfully applied in the sawmill industry to the strength grading of timber and automatic edging of boards. Microwave detection of defects in sawn goods is based on inhomogenity' or anisotropy associated with imperfections of wo