INTEGRATED CONDUCTING TUBE WAVEGUIDE TECHNOLOGY OF IMPROVED QUALITY Johann H. Hinken ABSTRACT The integrated fabrication process for conducting tube waveguide circuits is considerably improved. Q-factors up to 1000 around 30 GHz are obtained. It is shown, how, simultaneously, the process could be substantially simplyfied. So a cheap and sufficient method seems available for the mass production

QU.ALITY FACTORS OF UNLOADED EVANESCENT MODE RESONATORS Jan Vrba ABS'lRA:CT New general relation for unloaded Q-fac;tors (Qu) of resonators realized by a lumped ca.paci ty or its eq1livaJ.ent which is connected in a se<1tion of a waveguide below cutoff is briefly derived and its applications are shown in this paper. This relation expresses the dependence of "-u both on terminations of such re

MICROWAVE HEATING OF REALISTIC CYLINDRICAL MODELS OF HUMAN LIMBS HalUk Tosun * and tsmail Karayllan *k ABSTRACT The distribution of absorbed electromagnetic power density inside arbi~rarily cross-sectioned, infinitely long cylinders of biological tissue is analyzed by a method, called the Boundary-Condition-Transfer (BCT) method. The analysis is carried out in the resonance frequency

NUMERICAL "IN VIVO" MICROWAVE SIMULATION AND MODELS FOR MICROCOAXIAL MEASUREMENTS OF DIELECTRIC PARAMETERS BAND (1-12 GHz). ~~ ~~ PROBES. APPLICATION OF BIOLOGICAL MEDIA TO IN THE F. Bliot, A. Castelain, B. Dujardin ABSTRACT In vivo measurements of the complex permittivity = E' - jE" imply appropriate investigation methods. In this direction, we present an input measurement method associat

MICROWAVE MOISTURE DETERMINATION OF COAL.ATTENUATION AND PHASE MEASUREMENT. Albert Klein A COMPARISON OF ABSTRACT The major distu:~bing influences on moisture determination of coal were investigated by measuring the attenuation and the phaseshift of the transmission in a wide frequency range: The influence of bulk density and layer thickness can be eliminated by an additional determination of t

MICROWAVE OF IMPROVED Jerzy INSTRUMENTATION ACCURACY FOR INDUSTRIAL ON-LINE MEASUREMENT Kalinski Abstract: A principle of operation of two systems with an alternating measurement of the reference and the measured quantities has been discussed. They make it possible to reduce the inaccuracies of the results of measurement without need of: using highly stabilized elements or devices, stabiliza

A 2-WATT X-BAND FET AND IMPArl DIODE INTEGRATED AMPLIFIER Thcaas Chen-Chou 80 and Shiang Fu ABSTRACT A practical design and performance of 2 watts, 800 MHz 1-dB bandwidth, GaAs FET and Silicon IMPArl diode integrated amplifier via HIC technique are presented. 

MICROWAVE EQUIVALENT LINE CIRCUITS OF GUNN DIODE PACKAGES IN MICROSTRIP K. Hoffmann, J. Zehentner ABSTRACT Equivalent circuits of Gunn diode packages located at the end of a microstrip line are determined by measuring frequency dependence of reflection coefficient of the short- and open-circuited packages. For X-band, equivalent circuits for three types of Gunn diode packages and two types o

EFFECT CF NONL:JNFARA VALANCHE PROCESS IN D.PA TTS S.C. Tiwari* W.S. Khokle* and M.L. Sisodia~l-'.t- ABsrRACT !in intrinsic limitation en maximum rf modubtion has been shown to arise in the aValanche region of the diode. Narrow avalanche region diodes Can have high rf modulation and hence high efficiencies. The nonlinearity of ionization process gives rise to a new rectification effect termed

1\ NEW-TYPE QF ELECTRONIC CIRCULATOR AT SOOMHz BAND YOhsiyuki Naito*, AAihiro Ikeda*** Mikio Iwakuni**, Kiyomichi Araki*, and ABSTRACT 'A new way to construct an electronic circulator by using transistors is proposed, and the characteristics of such an active circulator at SQOMHz are presented. This is suitable for a monolithic integrated circuit, because no magnetic is . used.