IMPROVEMENTS IN CONSTANT BEAMWIDTH HORNS. P. J. Massey' .Abstract. This paper presents recent advances in the design of constant H-plane beamwidth horns. The theory of constant H-plane beamwidth horns is discussed and the relationship between aperture size and beamwidth is summarised. The expression for the beamwidth in terms of the H-plane flare angle is shown to be given by a simple formula

THE ANTENNA SYSTEM FOR THE TELE-X NORDIC COMMUNICATION SATELLITE Magnus Bonnedal~ * Per Ingvarson * ABSTRACT The paper describes the design and the measured performance of the antenna system for the TELE-X satellite, the Scandinavian direct broadcast and communication satellite. The two antennas are shaped, astigmatic double reflector systems. Good aperture efficiencies combined with low sid

SYNTHESIS METHOD LOW-PERMITTIVITY E. Vollmer ABSTRACT OF BROADBAND SUBSTRATES Hinken TAPERED STRIP ANTENNAS ON THIN and J.H. * A broadband tapered strip antenna on a thin low-permittivity substrate is designed by a new synthesis method for the geometry. The antenna is needed for a broadband spectrometer. Therefore, the antenna gain in at least one direction should be frequency independent

HIGH FREQUENCYGYROTRONS: RECENT RESULTS AT MIT R. J. Temkin, K. E. Kreischer and S. E. Spira* ABSTRACT Recent progress in high frequency gyrotron research at MIT is reported. 

HETEROSTRUCTURE ELECTRONICS MICROWAVE TRANSISTORS FOR UL TRA-HIGH-SPEED Charles A. Liechti * ABSTRACT Ultra-high-speed operation will be required primarily in fiber-optic communication links, millimeter-wave military systems and advanced test instrumentation. To meet these needs, a new generation of heterostructure microwave transistors, fabricated on silicon, GaAs and InP, is emerging. Th

RESEARCH WORKS IN SHORT-MILLIMETER AT SUB-MILLIMETER WAVE FREQUENCIES WAVELENGTHS AND - BEYOND - RESEARCH IN JAPAN Koji Mizuno* Abstract The submillimeter band forms a transition region between the microwave and visible regions. Both the microwave and visible regions are fully utilized, but in order to use the entire electromagnetic spectrum for the benefit of mankind, we must develop the

MICROWAVE CERAMIC DIELECTRICS AND THEIR APPLICATIONS Toshio Nishikawa ABSTRACT Many kinds of dielectric resonator materials have been developed since 1970, and in the present decade, the Q values of these have been remarkably improved. Dielectric resonators with dielectric constant from 20 to 90 are now available, and they are being used for appilications such as microwave filters and oscillators

ON-BOARD SATELLITE MULTIBEAM ANTENNA TECHNOLOGIES FOR FUTURE COMMUNICATION Isao Ohtomo and Hiroyuki Kumazawa* ABSTRACT This paper describes an overview of the most significant advances in on-board multibeam antenna technologies in Japan, particularly on the antenna system with low sidelobe, low cross polarization and high antenna pointing accuracy for ETS- VI. 

DIGITAL BEAMFORMING Hans Steyskal ABSTRACT Digital beamforming (DBF) is an emerging technology which represents a quantum step in antenna performance. The approach preserves the total information received at the array aperture which, coupled with the flexibility of digital processing, offers a number of attractive features beyond the capabilities of conventional arrays. The intent of this paper

DELIVER 100,000 MODULES A MONTH? OF COURSE, WE USE CAM! Anthony M. Pavio* ABSTRACT The application of computer-aided manufacturing (CAM) techniques to the assembly and test of a low-cost high-volume X-band Radar T/R module will be investigated by highlighting the differences between low frequency and microwave CAM methods, focusing on the difficulties of automated testing, evaluation and cir