A TWO CHANNEL ANTENNA G.A. RECEIVER AT 22 GHz FOR HOLOGRAPHIC MEASUREMENT OF REFLECTOR PROFILES G. Schneider, N.J. Keen, J.W.M. Baars Ediss, ABSTRACT This paper reports a two channel, coherent holography receiver for the measurement of the two dimensional reflector profile of the 30 m millimeter radio telescope at Pico Veleta, Spain. Using a phase and frequency locked Gunn oscillator as loc

AIRBORNE IMAGING SYSTEM USING CRYOGENIC RECEIVER MODULES AT 90 AND 140 GHz B.Vowinkel*, K.GrUner+, H.SUss+ and W.Reinert# ABSTRACT A high-resolution airborne imaging system has been developed cryogenic receiver modules at 90 and 140 GHz. They consist barrier mixers followed by GaAs-FET IF amplifiers. The DSB temperatures are 210 K for the 90 GHz and 250 K for the 140 The instantaneous bandwid

A NEW APPROACH TO THE DESIGN OF WIND SCATTEROMETERS A Thompson ABSTRACT This paper outlines a new approach to the design of satellite wind scatterometers which promises a major reduction in power consumption whilst maintaining, or even improving, the measurement accuracy. The approach permits a larger antenna area to be used and allows the available RF energy to be distributed in an efficient ma

DIMENSIONAL TOLERANCES AND TUNING OF INTERDIGITAL LINEAR PHASE FILTERS J H CLOETE ABSTRACT Sensitivity analysis is used to relate the electrical performance of an interdigital linear phase filter to manufacturing tolerances. A tuning procedure is presented in which the cross coupling between adjacent reso= nators is adjusted by the use of dielectric film to cover the slots in the mutual g

THE FREQUENCY STABILITY OF A CYLINDRICAL DIELECTRIC RESONATOR IN MIC Eli Friedler and Zev Bogan* ABSTRACT The overall temperature stability of a dielectric resonator mounted in a MIC structure is calculated taking into account the influence of all structural parameters. Results are presented for various practical structures. 



ANALYSIS OF A NOVEL OFFSET PARALLEL STRIP LINE ON A DmLEC'fRIC SUBSTRATE N.H. SABHNANI*, B.V. RAO+ TRANSMISSION ABSTRACT Assuming a quasi-TEM mode of wave propagation and using Conformal Mapping Technique, simple, closed-form and accurate expressions have been arrived at for the Offset Parallel Strip Transmission Line (abbrv.Offset-PSTL) in free space. A model has been proposed for evaluating t

ACCURATE MODEL FOR RING- AND DISC-TYPE MICROSTRIP RESONATORS A.-M. Khilla+ ABSTRACT A novel and accurate model to frequency dependent characterization of ring and disc micros trip resonators, based on a parallel-ring radial waveguide model, is given. closed form expressions for the resonant frequencies associated with microstrip resonators of arbitrary conductor widths and radii are supplied

ANALYSIS OF MULTIMODES INTEGRATED COPLANAR LINES FOR ~IICROWAVE CIRCUITS APPLICATIONS B.Janiczak. ABSTRACT Multimodes coplanar lines with arbitrary cross-section shape are analysed by the spectral domain technique. Two approaches possible in the calculations of the properties of multiconductor printed transmission lines are proposed, discussed and compared to each other. The dispersion cha

VARIATIONAL METHOD FOR ANISOTROPIC DIELECTRIC WAVEGUIDES I.V. Lindell, M.I. Oksanen ABSTRACT A novel stationary functional is introduced for the analysis of open dielectric waveguides with transverse and/or longitudinal anisotropy. The functional is applicable to arbitrary dielectric and anisotropic profiles. As an example it is applied for two types of anisotropic optical fibers, one with a