DES I GN AND MEASUREMENT OF FREQUENCY SELECT I VE SURFACES (1~) P. B i e I Ii, S. Contu, D. Sav i n i ( 1H~); A. Sa i tto (1HHq; R. T ascone (1HHH~) ABSTRACT A new method for dimensioning a multiple layer Frequency Selective Surface (F.S.S.) based on an appropriate electromagnetic model wi I I be examined. Feasibi I ity and performance I imitations of F.S.S. having a single grid of Jer

A PRECISION 3-m RADIOTELESCOPE WAVELENGTHS FOR ASTRONOMICAL OBSERVATIONS AT MILLIMETER AND SUB-MILLIMETER B.Vowinkel*, G.Winnewisser*, H.Mader+ and W.Pritzer# ABSTRACT A 3-m Radiotelescope with a surface accuracy of 3~m (r.m.s.) has been constructed that will be used for astronomical observations at millimeter and sub-millimeter wavelengths. At present the telescope is equipped with a tuna

A NEW AMPLITUDE AND PHASE CONTROL CONCEPT FOR MICROS TRIP PHASED ARRAY ANTENNAS M. Malkomes, H. J. Schmitt ABSTRACT The design and performance of a receiving 8-element microstrip antenna array for X-band operation is discussed. A new phase and amplitude control concept using electronically tunable antenna loads is presented which has been employed in the design of a planar phased array antenna wi

PRIMARY AND SECONDARY PATTERNS FROM ARRAY-FED OFF-SET REFLECTOR ANTENNAS P.J.B. Clarricoats, S.M. Tun, R.C. Brown and C.G. Parini* ABSTRACT The paper describes how mutual coupling influenees both the primary and secondary radiation patterns of array-fed off-set reflector antennas. The principle cause of adverse crosspolarisation is attributed to coupling This then is the main cause bet

MICROSTRIP HIGH PASS FILTERS WITH MULTIOCTAVE SPURIOUS FREE PASS-BAND A. QUAGLIA * ABSTRACT This paper perimental strip small with size. very deals broad with the description pass semi (spurious of the design lumped free) filter procedure and ex- results for an high passband realized in microand a very characteristics 

A NEW DESIGN METHOD OF RE-ENTRANT CAVITY BANDPASS FILTERS A. Ikeda*, H. Konishi* and M. Sakai* ABSTRACT A new method of designing re-entrant cavity bandpass filters is discussed. By using this method filters can be designed without any experimental trials. Filters are molded with identical outer dimensions over 4 to 8 GHz bands and mass produced. Their measurements coincide with theoreti

NUMERICAL SYNTHESIS OF SIMPLE WAVEGUIDE MODE SENSORS H. SChmiedel, and F. Arndt ABSTRACT A computer aided design of a rectangular waveguide H10-H20-mode sensor is demonstrated, which consists of a broad waveguide section with two asymmetric inductive irises, an H-plane asymmetric T-junction and an asymmetric junction to a smaller rectangular guide. The theory is based on field expansion into orth

EXACT IMAGE THEORY FOR THE SOMMERFELD HALF-SPACE MAGNETIC DIPOLE PROBLEM WITH A VERTICAL I.V. Lindell, E. Alanen ABSTRACT The classical Sommerfeld problem of a vertical magnetic dipole above a planar interface of two dielectric and possibly lossy media is considered in terms of image principles. It is shown that an exact continuous image can be constructed in closed form, which totally lies in

SPECTRAL DOMAIN INVESTIGATION SURFACE WAVE EXCITATION OF MICROSTRIP LINES AND MICROSTRIP DISK RESONATORS Joachim ABSTRACT Some considerations concerning the spectral microstrip lines and disk resonators including and radiation are performed. Numerical results representative covered and open configurations respect to the effective physical mechanisms. Boukamp# and Rolf H. Jansen+ AND RADIATION BY

SIMPLE AUTOh~TIC IMPEDM~CE METER IN THE MICROWAVE RANGE M. Kenderessy + ABSTRACT A new automatic method will be presented for the measurement of microwave impedance. The measurement system consists of two directional couplers and a slotted line. The slotted line works here as a switched device, the field intensity is measured by it only in its two extreme positions. For the calibration of the