OPTICAL CONTROL OF ACTIVE INTEGRATED ANTENNA Shigeo Kawasaki. and Tatsuo Itoh. ABSTRACT The reactance of MESFETs in the active integrated antenna are controlled by illuminating with a laser or a fiber illuminator. For the slot antenna with reactive FETs operated by an external source, the optical tuning range of 110 MHz was obtained at 10 GHz. Further, for the quasi-optical oscillator using a MES

POSSIBLE REALIZATION OF ELECTROOPTIC TECHNIQUES AN RF LOGARITHMIC AMPLIFIER BV USE OF Asher Madjar*, Arthur Paolella+, Peter R. Herczfeld+ . ABSTRACT The photodetection mechanisms in GaAs MESFETs have been investigated by several researchers. Recently the authors have published an in-depth study of the MESFET as an optical detector under constant illumination involving both experiment

MEASUREMENT METHOD FOR CHIRAL MEDIA by S. OUGIER1.2, I. CHENERIEl, S. BOLIOLI3 1. University Paul Sabatier Equipe Antennes Dispositifs et Materiaux Microondes 118 route de Narbonne 31062 TOULOUSE Cedex (FRANCE) 2. MATRA MARCONI SPACE FRANCE 31 rue des Cosmonautes 31077 TOULOUSE Cedex (FRANCE) 3.0NERA-CERT-DERMO 2 avenue Edouard Belin 31055 TOULOUSE Cedex(FRANCE) ABSTRACT During last years, th

CAD MODELING OF HIGH-TEMPERATURE SUPERCONDUCTING FILMS S G Kolesov, ABSTRACT The microwave technique needs the development of CAD for the microwave integrated circuits based on high-temperature superconducting films and intended to operate at the liquid nitrogen temperature. The model of bipolaron charge carrier transport was used to obtained the surface resistance as a function of temperature and

Microwave performance of very thin YB~Cu307-d films determined from microwave screening measurements Ruhr -Universitat Bochum, Institut fur Hochftequenztechnik UniversitatsstraBe 150, W-4630 Bochum, Germany Volker Miihlhausand Burkhard Schiek . Abstract The microwave performance of very thin (l0-200nm) High-Tc superconducting thin fi]ms as used for microelectronicapplications cannot be characte

CONDITIONS FOR NEAR-FIELD PHASE RETRIEVAL MEASUREMENTS OF REFLECTOR ANTENNAS IN THE MM AND SUB-MM WAVE RANGES Y.D. Cheung, G. Junkin and A.P. Anderson. ABSTRACT The performance of a double-intensity near-field phase retrieval algorithm is investigated. In addition to previously noted advantages of phase retrieval, it is shown from computer simulation that the accuracy of far-field prediction of a

TRUNCATION ERRORS IN CYLINDRICAL NEAR TO FAR FIELD TRANSFORM. A PLANE WAVB SYNTHESIS APPROACH J. Romeu, L. Jofre. ABSTRACT Cylindrical Near to far field antenna transformation is expressed as a plane wave synthesis problem where a plane wave is produced by a cylindrical current distribution that encloses the Antenna Under Test (AUT). The current distribution that produces the plane wave is direct

SIMULTANEOUS FREQUENCY AND DIRECTION FREQUENCY SCANNING ANTENNA ibrahim TEKiN, Altunkan HIZAL ABSTRACT FINDING TECHNIQUE USING A frequency and phase scanning antenna array system having the capability of finding simultaneously the frequency and the direction of arrival of the incident wave by using simple amplitude measurements is described. Microstrip wide slot is used as the antenna array ele

OPTIMISATION OF APERTURE DISTRIBUTIONS FOR SUM PATTERNS F. Ares *, Prof. R. S. Elliott ** and Prof. E. Moreno * ABSTRACT: We present a general method to get distributions with minimal edge brightening ( minimizing the mutual coupling problem) in sum pattern synthesis. The method obtains patterns, in which the infinitely deep nulls are replaced by less deep nulls. This provides a multiplicity of

ADVANCED DESIGN TECHNIQUES SYSTEM FOR THE VERY LARGE COMPACT RANGE (VLCR) REFLECTOR E. C. Ngai, ABSTRACT L. E. Rhoades, A. G. Cardiasmenos The compact range has become a popular measurement tool in the evaluation of microwave antennas in recent years. Larger aperture reflectors operating over the entire microwave and millimeter wave spectrum are now required, Olver (1). In this paper, the s