HIGHLY ACCURATE FAN RIB TYPE MESH DEPLOYABLE REFLECTOR WITH PRECISE SURFACE ADJUSTER AND LINK DEPLOYMENT SYSTEM T. ITANAMI*, M. MISAWA*, H. KUMAZAWA* ABSTRACT This paper describes the techniques that realize a highly accurate and reproducible fan rib type deployable mesh reflector. A surface adjuster using a precision screw mechanism and large pads is developed to accurately form the mesh surf

THE INVECTIGATION OF SEKICONDUCTING OROTRONS WITH THE DISTRIBUTED ... ANALOGS OF KLYSTRONS AND OF INTERACTION' L V Vavriv * ~ The self-consistent problem on interaction of charge carriers within the semiconductor with the field of slow-wave structures located ,in resonators has been solved. The physical processes have been studied and the optimal interaction conditions in the semiconducting

DIGITALLY CONTROLLED 10.5 GHZ COMPLEX WEIGHT CIRCUIT FOR NULL STEERING ARRAYS S.O. Nylund* and F.I. Paoloni** ABSTRACf Null steering array antennas require proper selection of the amplitude and phase on the excitation of each element. This paper describes a microstrlp PIN-diode circuit that is capable of changing amplitude and phase at X-band frequencies. The device consists of a pair of variabl

A NEW APPROACH FOR FET MODELLING P. Neverma.nn and I. Wolff ABSTRACT A FET model is presented which is based on an analytical approximation of the velocity overshoot. The bias dependent peak velocity and the electric field in short-channel-FET's are described by means of a new principle in physical simulation. This approach is equivalent to the use of a saturation velocity, which depends not only

A HFET millimeterwave resistive mixer Herbert Zirath, IIcho Angelov, Niklas Rorsman Applied Electron Physics Chalmers University of Technology, . Goteborg, Sweden. Abstract A millimeterwave resistive mixer based on. a heterostructure field effect transistor (HFET) is described. A minimum conversion loss of 8 dB, including losses in the connectors, filters, substrates etc, is obtained in the fr

90 GHz SIMMWIC RECTENNAS K. M. Strohm. J. Buechler, J. F. Luy ABSTRACT Rectifying antennas (Rectennas) have been fabricated with zero bias n- and pSchottky barrier diodes and planar antenna structures on high -resistivity silicon substrates. The rectenna is manufactured by silicon monolithic millimeter wave integrated circuit (SIMMWIC) technology. The maximum sensitivity of the rectenna is 153 mV

THE CLINOTRON G Ya I,evin:'+~, A Ya Usikoy't: ABf'.THACT A. Ya Kiricben}{o.. < - A T Bcn:'o(l}tjn- ~ ~-; A ChuriJovatt. ,d. 1.: 11'In this paper the clinotron physical model and performances of'r'~me"lo"eC' tJo.)..~.1 ~.I.J,:,,;::-, .;:) ".~ ,,~U.o .1 1-" Ij'o.JJ.L.t:L~ .; ~.1T11.-. ,,' ..; r. +""'~ ~r."...,""'- ' ;':;U:~,,",f!n Presented. The clinotron is a new source of n electromagnetic

COOLED CASCADED FREQUENCY MULTIPLIERS AT 1 THz J yrki T. Louhi 1, Antti V. Raisanen 1 ~ It has been shown by theoretical calculations that the required all-solid-state local oscillator power for a Schottky diode mixer at 1 THz can be obtained by cooling a Schottky varactor frequency multiplier chain. The first reason for the higher output power by cooling is the decreased series resistance of the

COHERENT S.N.Dunaev, ABSTRACT MICROWAVE Y.K.Fetisov PULSES OSCILLATION' BY MAGNETOSTATIC WAVE ' DELAY LINE MODE-LOCKED OSCILLATOR * The coherent microwave pulses oscillation tostatic backward volume wave de 1aJ'T line by a mode-locked magneoscillator have been realized and investigated. This spectrum of oscillation frequencies and envelope of coherent microvave pulses have been calculate

NOI SE R. Sezer*, FI GURE REDUCTION O. Palamutcuoglu** IN MESFET MI XERS BY I F FEEDBACK ABSTRACT The effect of the RF feedback on noise-figure and conversion-loss of the gate pumped MESFET mixers are investigated. The optimum values of the reactive feedback elements for various pump levels and bias conditions which provide the minimum noise -figure conditions are calculated from the noise equi