NUMERICAL SOLUTION OF TRANSIENT ELECTROMAGNETIC SCATTERING PROBLEMS C. Leonard Bennett ABSTRACT A novel computational technique is presented for obtaining the numerical solution of transient electromagnetic scattering problems directly in the time domain. This technique consists of numerically stepping on in time the exact space-time integral equation that represents the solution of the scatt

APPLICATIONS OF GTD TO ANTENNA PROBLEMS. Knud pontoppidan+ ABSTRACT: A general computer program package based on the geometrical theory of diffraction (GTD) is presented. The programs are based on a modular approach such that a complex geometry is broken down into smaller and simpler substructures. The applicability of the program package is illustrated by a number of examples ranging from di

DESIGN OF LOW LOSS 12 GHZ OUTPUT TELESAT MULTIPLEXER SATELLITE FOR THE SECOND GENERATION S. Ka11ianteris* CANADA ABSTRACT The basic design considerations for the 12 GHz low loss TE103 filters are described. The synthesis, optimization and realization of a new type low loss non-contiguous triplexer which uses the above filters and a WR75 manifold is presented. Test results of an engineering

DIELECTRIC WAFER FILTERS IN WAVEGUIDE B.F. Nicholson and B.K. Watson* ABSTRACT and Filters comprising dielectric wafers in TE1O mode rectangular, or semi-circular waveguides are described. Their TEO1 mode circular suitability for use in overmoded guides and for high power levels is explained. Design procedures and a computer optimisation process are formulated which allow wafers of standard

RESONATED COMBLINE BANDPASS FILTER G.R. HOFFMAN ABSTRACT By loading the interior conductors of a classical combline filter with a series resonating impedance, very steep upper band skirt response may be generated. The procedure is particularly interesting for extending etched circuit combline filter technology to the lower microwave frequencies, with significant increases on filter performanc

COPLI-"'\NA.~ LINES: TO BROADBAND MICRaVAVE :rNI'ffiRATEDCIOCUITS APPLICATION M. HOODART' * ABSTRACI' The paper begins with a brief review of some of the shortcamings of the microwave microcircuit techniques most widely used in research and industry (e.g. microstrip, suspended stripline, and slot line). This is followed by a discussion of the advantages likely to be associated with the utiliz

"THE FIELD FOCUSING FILTER" A NOVEL FORM OF MICROWAVE BAND BRANCHING FILTER D.E.N. Davies and A.Y. Niazi * ABSTRACT The paper describes a new form of microwave branching filter which may be realised in either waveguide or a microstrip form. The filter incorporates a semicircular non resonant cavity in which the various output frequency bands are focused to emerge at different output port

REDUCED COUPLING APERTURE OF MICROSTRIP STUBS PROVIDES NEW ASPECTS IN STUB FILTER DESIGN G. Kompa Abstract: Generally microstrip stubs are coupled galvanically over the whole cross-section of the adjoining main lines. Reducing the coupling aperture two effects can be observed being superimposed: Smaller coupling apertures lead to higher skirt selectivity, increase, however, the excitation of high

HIGH POWER LOW NOISE Pt-SCHOTTKY BARITT DIODES J. Freyer, S. Ahmad and W. Harth Abstract: The fabrication of Pt-Schottky Baritt diodes is described. Output power as high as 152 mW at 8.6 GHz has been obtained with an efficiency of 2.3 %. The highest efficiency of the diodes is 3 %. The signal to noise ratio is 150 dB and 100 dB for AM and FM noise, respectively. Minimum noise measure of 17 dB

SMALL DAYEM BRIDGES AS ACTIVE COMPONENTS IN MICROWAVECIRCUITS P. E. Lindelof, M.T. Levinsen, T. D. Clark* N.F. Pedersen, 0 .H. S9Srensen and J. Mygindt M. Danielsen + ABSTRACT We report X-band microwave measurements on superconducting thin film microbridges (Dayem bridges), mounted in a half wavelength cavity with an adjustable coupling to match the bridge properly. Power emission from the brid