A CIRCULARLY POLARIZED OFFSET REFLECTOR ANTENNA FOR DIRECT BROADCASTING SATELLITES D. Fasold;* M. Lieke* ABSTRACT The design objectives and electrical performance data of a circularly polarized offset reflector antenna for the illumination of the FRG are presented. The requirements are based on the WARC regulations settled for direct broadcasting satellites /1/. The antenna consists of an offset

LARGE BANDWIDTH REALISATION IN DUAL MODE CORRUGATED GUIDE FEEDS N. SRIDHAR AND G.P. SRIVASTAVA ABSTRACT Overmoded corrugated guide feedst used for high efficiency illumination of reflector antennast suffer from an inherently restricted bandwidth of operation because of the dispersion in phase velocities of the modes. Experimental resultst obtained with a 2-hybrid-mode feedt show that the dispe

COMPLEX EIGENVALUES OF CORRUGATED WAVEGUIDE H. L. Wang and R. R. Zhang* ABSTRACT A new method for resolving the boundary condition eigenvalue equation of the cylindrical corrugated system is given. According to this method, the real or the "imaginary roots of the eigenvalue equation can be computed rapidly and easily, especially, the superiority is manifested for computing the complex roots. All

DUAL-DEPTH CORRUGATED HORN DESIGN A.D. Olver, P. Yang Kezhong and P.J.B. Clarricoats* ABSTRACT The dual-depth corrugated horn gives low cross-polarisation at two separate operating frequencies. A space harmonic formulation has been used to study the influence of the corrugation geometry on the cross-polarisation characteristics. Results show that about seven slots per wavelength are needed

VISPERSION MICROSTRIP CHARACTERISTICS LINE WITH + TUNING ANV ENERGY CONFIGURATIONS SEPTUMS LAIV ON MUSCLE. OF A P. PRIBETICH + ++ ,P. KENNIS ,s. TOUTAIN ABSTRACT In this paper,we present the study of micros trip lines with tuning septums laid on muscle. For several values of the complex permittivity, we give the frequency behaviour of such structures(effective permittivity, attenuation and e

THREE DIMENSIONAL ~~OM MEASUREMENTS IRRADIATION VALIDATING THE USE OF PHASED ARRAYS FOR DEEP-SEATED TUMOUR M. Melek*, A.P. Anderson*, J. Conway+ and B.H. Brown+ ABSTRACT The feasibility of using phased arrays for focused microwave hyperthermia is examined. A prototype system consisting of a semi-elliptic array of six 2.45GHz dipole antennas surrounding a homogeneous cylindrical body w

THE NON-THERMAL EFFECT OF MILLIMETER WAVE RADIATION ON THE PUFFING OF GIANT CHROMOSOMES F. Kremero ,C. Koschnitzke*, A. poglitscho ABSTRACT L. SantoO, P. Quick*, A non-thermal influence of millimeter wave radiation (swept in frequency from 64.1 GHz to 69.1 GHz, sweeptime 6 s, and with stabilized frequencies of 67.200 t 0.001 GHz and 68.200 t 0.001 GHz, power density ( 5 mW/cm2) on the puffing o

MICXXXH>Ul'ER CDNI'ROILED ANl'ENNA RADIATICN PATrERN MEASUREMENTS R. J. Langley and D. Papaioannou* ABSTRAcr An autanatic antenna radiation pattern rooasurement system based on a microcanputer is presented. Stepper lIDtors, directly controlled by the canputer, are used to drive elevation, azimuth and polarisation posi tioners. During rooasuraoont the canputer programs the signal source, collects

AN AUTOMATIC ERROR CORRECTION METHOD FOR MEASUREMENT POLARIZATION J. Budin OF ANTENNA ABSTRACT A novel approach to polarization measurements is presented. It is based on the phase-amplitude method of polarization measurement and is developed on the analogy between the polarization and reflection measurements. Procedures for computer controlled automatic calibration, measurement and error correct

NEAR J.R. FIELD Brain RADAR ANTENNA TESTING and P.A. Langsford ABSTRACT The practical description and theoretical basis of an outdoor, transportable, cylindrical near field antenna test facility is presented. The fully automated system makes small demands upon overall test time, computer storage and processing time. Its prime purpose is for radiation pattern testing of large L-Band radar an