THE TDRSS 18. 3-METER Ku-BAND ANTENNAS Anthony J. Gianatasio and T. W. Leonard* ABSTRACT Three 18.3 meter diameter Ku-band antennas have recently been completed as part of the Tracking and Data Relay Satellite System (TDRSS) Ground Station at the NASA Johnson Space Center, White Sands Test Facility in New Mexico, U.S.A. These antennas, which are believed to be among the largest Ku-band satel

RECEIVING ANTENNAS FOR THE NAVSTAR GLOBAL POSITIONING SYSTEM R.M.T. MILNE ABSTRACT Two new types of shaped beam antennas have been designed and developed reception of signals from satellites operating in the NAVSTAR Global Positioning System. The antennas are required, to provide a circularly polarized 2TI steradian coverage. To achieve the required radiation pattern, arrays of scattering e

12 GHz SCANNING SPOT BEAM PHASED ARRAY FOR SATELLITE COMMUNICATION N. Amitay* and A. J. Rustako, Jr.* ABSTRACT: The implementation of a fast scanning spot beam phased array system for satellite communications is discussed. The integration of a 16 element linear phased array, phase shifters, phase memory and sequencer, and a controller is shown. This system also incorporates a novel self-cohe

A NOVEL ~lIC SLOT-LINE ANTE1UIA S.N. Prasad and S. Mahapntra* ABSTRACT A new Microwave Integrated Circuit (MIC) slot-line antenna has been developed. This is intended for application in short range radar and phased array systems. The new antenna can replace the conventional MIC dipole and resonator antennas with its distinct advantages of a sharper beam for the same order of gain. The antenna i

CALCULATION OF THE BANDWIDTH OF MICROSTRIP RESONATOR ANTENNAS J. Vandensande, ABSTRACT. H. Pues, A. Van de Capelle. In this paper one presents an analysis of the bandwidth of microstrip resonator antennas in function of the antenna parameters. Starting from the general expression for the quality factor of a resonator, it will be proved that the bandwidth of a micros trip resonator antenna

A SIMPLE RADIATION MODEL FOR MICRISTRIP ANTENNAS M.T.Birand * ABSTRACT An approach that uses a combined theoretical and experimental best-fit technique for developing radiation models for patch type microstrip antennas is proposed. Far-field expressions involving two major parameters relating the equivalent electric and magnetic type sources in the model are derived. The appropriate values o

ANALYSIS AND DESIGN OF TRIPLATE CORPORATE FEEDS AT HIGH FREQUENCIES P. S. Ha11* an d J. R. James * ABSTRACT The analysis and design of an integrated triplate corporate feed for a microstrip antenna array has been examined. A mode matching technique is used to calculate the reactive behaviour of each junction and taper in the feed and the results are compared to those obtained using static appr

THE VIVALDI AERIAL P.J. Gibson* Abstract The Vivaldi Aerial is a new member of the class of aperiodic continuously scaled antenna structures and, as such, it has theoretically unlimited instantaneous frequency bandwidth. This aerial has significant gain and linear polarisation and can be made to conform to a constant gain vs. frequency performance. One such design has been made with approximatel



THE SIX-PORT AND THE MICROPROCESSOR IN MICROWAVE MEASUREMENTS A. L. Cullen ABSTRACT A tutorial introduction to six-port measurement techniques is attempted. For simplicity, the general network analyser using a dual six-port system is excluded; a single six-port used as a reflectometer represents the scope of this paper. Emphasis is on basic concepts rather than practical details. It is shown, ho