A 93 GHZ CIRCUMFERENTIAL WITH BROAD BANDWIDTH Holpp* WAVEGUIDE BANDPASS FILTER AND LOW LOSS Wolfgang ABSTRACT A new waveguide band-pass filter has been developed and realized for W-band. It differs significantly from traditional microwave filters at lower frequencies subsequent upon a very simple arrangement which is well-suited for milled splitblock waveguide design. The band-pass filter co

MODE-FREQUENCY ANALYZER FOR HIGH-POWER GYROTRONS IN THE 2-MILLIMETER WAVE RANGE M. Kitlinski*, G. Hochschild**, W. Wiesbeck*** ABSTRAC Experimental research on high-power high-frequency gyrotrons requires microwave diagnostic devices suitable to study multimode and multifrequency oscillations in the highly oversized cylindrical output waveguide. Therefore a special mode-frequency analyzer MFA is

RECENT ADVANCES IN THE USE OF SUB-MILLIMETRIC WAVE TECHNIQUES TO OBTAIN BACKSCATTER INFORMATION AT THE UK NATIONAL SCALE MODELLING CENTRE S.E. Bathe,* B.E. Prewer,* G. Villis* ABSTRACT Systems at sub-millimetric wavelengths used for obtaining detailed radar backscatter information on scale model targets are discussed. A full illumination 890 GHz amplitude and phase measuring system and a new

A MODIFIED FIN-LINE STRUCTURE FOR THE REALIZATION FIELD DISPLACEMENT ISOLATOR AT 8-12 OF THE GHz AND 60-90 GHz DEYAN GUAN and ROLAND HOFFMANN * Abstract A not fin-line going structure. filled with a waveguide abstract over the full height of the waveguide has been investigated.A theoretical model allows to predict the dependence of the field displacement effect on both. ferrite height and

A SOLUTION TO THE INVERSE SCATTERING PROBLEM OF LARGE CONDUCdTING OBJECTS P. C. H. Chert. G. Wadl and G. Heidbreder* ABSTRACT We describe two solutions to problems of electromagnetic wave scattering by large conducting objects. The solutions are equivalent to each other in the sense that they produce the same scattered field if no approximations are made. When we do make approximations these sol

The Toroidal Hollow Waveguide with Smoothly Tapered Cross Section KW. Kark 1) Abstract The stationary electromagnetic boundary value problem with harmonic time dependenceeiwt is is t treated for loss-free, slightly inhomogeneous hollow waveguides with circular cross section. Starting from the canonical problem of the homogeneous circular cylinder the influence of small changes of the cross

Analysis of Microstrip Antenna Arrays with Thick Subtrates R.C. Hall, J.R. Mosig and F.E. Gardiol* Abstract An accurate microstrip coaxial feed model is introduced that is valid for substrates of arbitrary thickness. The Method of Moments is employed using basis functions on each of the patches of the array and on the coax feed probes. Special attachment modes are used at the coax/patch junction.

THE COMPLEX RESONANT DIELECTRIC RESONATORS Wenxin Zheng* FREQUENCES OF OPEN COMPOSITE ABSTRACT A technique based on the null field method is developed to investigate the resonant frequencies and the quality factors of composite dielectric resonators. Numerical results are compared with previously published calculations and experiments whenever possible, which show that the present technique is

LOSS AND BANDWIDTH CONSIDERATIONS IN CLOSED GROOVE WAVEGUIDES G.Bartolucci', ABSTRACT G.Leuzzi* The closed groove guide is studied for low loss applications in V-band; the attenuation of the fundamental mode and the upper cutoff frequencies are found. A comparison in terms of losses and bandwidth with the rectangular waveguide indicates that no clear advantage results. 

THE LOSS ANALYSIS OF INSET DIELECTRIC COMPARISON WITH IMAGE LINE GUIDE INCLUDING BENDING LOSS AND A S. Hedges * and T. Rozzi ** ABSTRACT This paper presents the loss analysis of Inset Dielectric Guide (IDG). IDG offers the potential for practical low loss circuits operating at frequencies above 100 GHz. The formulation of the loss components is discussed and the computed loss of a straight sect