A MULTIFEED OFFSET REFLECTOR ANTENNA FOR THE INTELSAT V COMMUNICATIONS SATELLITE C. C. Han* ABS TRAG T An array-fed offset reflector antenna is used to provide shaped hemispheric and zonal coverage for the INTELSAT V communications satellite. The objectives of frequency reuse via both sidelobe isolation and crosspolarization isolation and efficient beam shaping are accomplished by optimizing fee

SHAPED-BEAM ANTENNA WITH LOW CROSS POLARIZATION N. Chr. Albertsen ABSTRACT. It is well known that low cross polarization may be obtained in a conventional high gain antenna with rotational symmetry when a Huygens source is used to illuminate the reflector surface. In satellite communication links it is, however, often desireable to have an elliptic beam with extremely low cross polarization.

FREQUENCY DEPENDENCE OF CORRUGATED HORN MODE ORDER A.Marincic* B.Milovanovic + ABSTRACT Corrugated conical horns are extensively used as radiators where a relatively broadband and symmetrical radiation patterns are needed. The properties of these horns were investigated by many workers, both theoretically and experimentally. In some works frequency variation of groove wall admittance was ignor

MATHEMATICAL MODELLING OF THE RADIATION FIELDS FROM MICROWAVE PRlMARY- FEED ANTENNAS N A Adatia A W Rudge C Parini ABSTRACT Numerical modelling of reflector antenna radiation fields has received considerable attention in the literature and techniques based upon Physical-optics are widely employed. A major limitation in the application of such techniques is the accurate mathematical modellin

ALL FOR SOLID STATE 1800-CHANNEL RELAY TRANSMITTER-RECEIVER 6 - 8 GHZ RADIO SYSTEMS and K. Kinoshita N. Kusama, K. Sakamoto, T. Kyuzaki ABSTRACT This paper describes an all solid-state heterodyne transmitter-receiver in the 6 to 8 GHz band with a capacity of up to 1800 telephone channels. The equipment is fitted with an NEC-0.5 micron gate GaAs MESFET pre-RF amplifier having a noise figu

BROADBAND ADAPTIVELY-CONTROLLED POLARIZATION-SEPARATION NETWORK Anthony J. Gianatas}o * ABSTRACT A broadband adaptively-controlled frequency-reuse system has been developed and demonstrated. The system is designed to operate at 11 GHz and above, where polarization deorthogonalization due to rain effects is a problem. Direct analog control is used to continually correct for varying cross pol

A H~GH CAPACITY Pau1 R. Hartmann, DIGITAL Joseph TRANSMISSION A. Crossett, SYSTEM AT 11 GHZ and Eddie W. A11en* ABSTRACT The advent an attractive described solid-state performance with very high capacity digita1 microwave radio equipment is providing alternative for PCM transmission. A 90 Mb/s digital radio is here which uses 8 PSK modu1ation, low loss filtering, and modern design to achieve a

A COMPACT AND VERSATILE 19 GHz DIGITAL RADIO FIELD TRIAL EQUIPMENT L.J. Stagg and J.M. Robinson ABSTRACT A digital radio equipment operating at frequencies around 19 GHz is described. Designed for field trial applications it can be used in a variety of configurations, allowing trials of multichannel telecommunications systems and mobile or fixed, digitally encoded television outside broadcas

AN ADAPTATIVE PHASED ARRAY ANTENNA USING SIMPLE ALGORITHM J. ROGER, C. AUBRY, D RENAUD, F DEVAMBEZ * ABSTRACT This paper presents a simple and efficient method allowing the adaptation of electronically steerable antennas using quantized phase shifters. Adaptation aims to maximise the desired signal to external noise ratio. The process which does not involve the knowledge of the directions

CROSS FED PRINTED AERIALS * John. C. Williams. ABSTRACT The design of a simple printed planar array to replace horns in short range domestic radar and traffic control systems is described. The essential criterion is to keep the basic material and processing costs low, whilst retaining a necessary specified aerial performance. Cross-fed aerials use a novel diagonal fed array of microstrip radiati