A MM-WAVE SAR-DESIGN FOR HELICOPTER APPLICATION (ROSAR) H. Klausing, N. Bartsch , C. Boesswetter*) ABSTRACT First developments on Synthetic Aperture Radar (SAR) system based on use of Doppler information to obtain high resolution in azimuth direction were originated in 1951 by Carl Wiley. For short range battlefield reconnaissance applications mmwave imaging sensors find increasing interes

COHERENT PROPERTIES OF K-DISTRIBUTED SEA CLUTTER C J Baker* ABSTRACT A model based on a compound formulation of the K-distribution describing the amplitude and correlation statistics of coherently detected radar backscatter from the sea surface is proposed. In this paper it is shown how this model provides an excellent fit to the amplitudes of individual rangedoppler spectral components. This

YIG-TUNED STALOC DUAL-SELECTED FILTERS Zhang Bing-rong,Feng Kang-nian,Yu Shou-xi,Yu Kang,Wang Jie* ABSTRACT The 1 to 18 GHz YIG-tuned with the Self-Tracking dual-selected filters series had Automatic Lock-On Circuit(STALOC) been developed. They have advantages of accurate tracking, high reliability, broad frequency range, wide temperature range and applied flexibility. The STALOC filters

CIRCULAR POLARISA nON FILTER FOR ANTENNAS APPLICA nONS M. MISSOUM - F. JECKO * ABSTRACT The propagation properties of HE and EH hybrid modes, with circular polarisation, in helically corrugated waveguide are studied using the approximation of anisotropic surface impedance. The "convenient" dimensions of the structure polarisation) are proposed. able to propagate the only HE 11 + (left circul

TWO-OCTAVE STOPBAND MICROSTRIP LOW-PASS FILTER DESIGN USING BUTTERFLY STUBS and R. So~~entino F. Giannini, M. Sale~no ABSTRACT The appl ieation of a new design technique using non commensurate elements combined with the use of the butterfly stub permits lowpass filters with exceptional performances to be realised in microstrip configuration. Very compact microstrip filters exhibiting very

EVANESCENT MODE-SERRATED RIDGE WAVEGUIDE BANDPASS HARMONIC FILTERS A.M.K. Saad*, A. Mitha**, R. Brown** ABSTRACT A new class of bandpass harmonic filters with spurious free and extremely wide stopband response is presented. The design concept is based on using evanescent mode waveguide sections as impedance K-inverter, while using serrated ridge waveguide sections as series resonators. Measur

PRINTED HIGH POWER E-PLANE FILTERS WITH SPURIOUS-FREE RESPONSE RUEDIGER VAHLDIECK ABSTRACT Conventional high power E-plane metal insert bandpass filters produce spurious responses which appear between the desired passband and twice the midband frequency. This paper presents a design proposal which eliminates all spurious passbands in that frequency range up to more than twice the midband

TEl0-MODE WAVEGUIDES R. Vahldieck, FILTERS BELOW FORMED CUTOFF BY MULTILAYERED DIELECTRIC SLABS IN J. Bornemann, F. Arndt and W.J.R. Hoefer ABSTRACT --------------A new type of dielectric resonator filter is being introduced, utili- .zing longitudinal multilayered dielectric plates. The length of filter enclosure. Ladder-shaped dielectric slabs determining the dielectric slabs rather

THREE FACILITY ASTRONOMY N.J. Keen, LOW-NOISE RECEIVERS FOR MILLIMETER AND SUBMILLIMETER RADIO- K.-D. Mischerikow and G.A. Ediss* ABSTRACT Receivers are reported for the frequency bands 40-50 GHz, 215-245 GHz and 460-490 GHz. All use Schottky barrier diode mixers, cooled to 15 K, in a waveguide construction. In the two upper frequency ranges, a lens is required to match the telescope to

A CRYOGENICALLY COOLED RADIOMETER FOR 900GHz Lidholm S.U.+, Kelly W.M.+, Coughlan J.*, Wrixon G.T.+. ABSTRACT A cooled Schottky barrier diode heterodyne receiver has been constructed for operation at 900GHz. A corner cube mixer and a miniature closed cycle cooler were used. The double sideband receiver noise temperature at 890GHz was 15300K, with corresponding Tmxr = 7700K and Lmxr =