RING-SHAPED DIELECTRIC ANTENNA H.D.Hristov,J.R.Urumov and M.J.Semov * ABSTRACT This paper describes some results of an extensive theoretical and experimental work on a novel type of antenna design-a ring-shaped dielectric antenna. It consists of two basic elements:a dielectric ring and a primary feed.One possible construction of a such antenna has a ring with rectangular cross-section and a

EXPERIMENTAL ANALYSIS OF CORRUGATED CONICAL HORNS WITH VERY WIDE FLARE ANGLES E. PAGANA (*), P. MASSAGLIA (*) ABSTRACT It is well known the difficulty of predicting theoretically the radiation properties of a corrugated conical horn with very wide flare angle (28 ;.. 180"). So a detailed experimental analysis on these antenna feeders has been carried out as function of the geometrical parameters

CORRUGATED HORN OF HEn AND HE2l MODE Yang Shi-hua, Ke Shu-ren and Peng Guo-zhu ABSTRACT A corrugated conical horn for monopulse feed, which uses the HEll mode as sum. one and the HE2l as difference one, is described in this paper. When the ratio for the radius of the hor aperture and the free space wavelength is very large, the balanced hybrid condition can be met for both ~ and RE2l modes. T

A EUROPEAN CONTOURED BEAM REFLECTOR ANTENNA DEVELOPMENT N- Adatiat, ABSTRACT P. Ballingtt, B. Claydont, P. Ingvarson*tt, A. Roederertt~t This communication provides the present results of an ongoing development, sponsored by the European Space Agency, of design software and of a feasibility model for a contoured beam reflector antenna (COBRA), to cover Europe from a geostationary satellite.

THE APPLICATION MULTI-FEED OF SINGLE REFLECTOR SATELLITES ANTENNAS TO DIRECT T.V. By B. VIDAL SAINT ANDRE and P. NEYRET SUMMARY The antenna technique associating a single offset-fed reflector cut out from a revolution paraboloid to a multi-element feed source is being widely used for telecommunication satellites. This paper shows over the example of the French coverage area that the antenna



CALCULAfION OF THE RADIATION PATTERNS OF AXIALLY SY~~lliTRIC REFLECTORS Erdem Y'azgan and lVlehmet ~afak ABSTRACT Scattered ellipsoid, frequency fields fields from axially symmetric reflectors (paraboloid, by high- hyperboloid, asymptotic spheroid and plane) are calculated techniques. symmetric For this purpose, reflector the scattered in terms of values, be from an axially ar

A COMPLETE GTD ANALYSIS OF RIM LOADED CASSEGRAIN ANTENNAS. G. Dl Massa, . t C. Savarese. tt ABSTRACT. A corrplete nurrepical analysis of the radiation pattern of centered sy mretric Casse gt'ain antennas is car>ried out. The peripherical rilTB of both the reflector and the subreflector ar>e assurred to be loaded by material rredia described in terms of su:r>face i rrpedances. The Georretrical

NUMERICAL EVALUATION OF ANTENNAS FIELD USING A NEW APERTURE-LIKE EXPANSION O. M . Bucc1, . G. D E 11a, , . R. P1err1 . .(+) Abstract. scattered This paper deals with a new aperture-like allows from a limited allows number expansion of the field radiavalues, transforms FouperforThese aptime by a reflector one per antenna, which starting This rate, to reconstruct exact anal

FAST CAICUIATION OF FAR-FIEID FOURIER TRANSFORM Roberto Antonio Rodrigues PATTERNS OF REFLEC'IOH ANTENNAS WITH FAST de Ameida (*) , Jose Mazzucco JUnior (*) ABSTRACT The development of a numerical technique for the fast calculation of farfield radiation patterns of reflector antennas is reported. The technique applies to antennas subjected to a SIPall angle approxirna.tion, with no re str