A NEW KIND OF PLANAR WAVEGUIDE LUNEBURG ANTENNA FOR THE MM-WAVE REGION M. Vogel + ABSTRACT For the purpose of shortand medium-range high resolution imaging in darkness or low visibility conditions, e.g. for airfield surveillance use, narrow beamwidth millimeter wave antennas for fast and wide-angle scanning are required. Based on the principle of the Luneburg lens, a planar waveguide lens antenn

NONDESTRUCTIVE MEASUREMENT OF LOSSY MATERIALS USING THE REFLECTION FROM AN ARRAY OF NARROW SERIES SLOTS ON THE BROAD FACE OF A RECTANGULAR WAVEGUIDE T. Martinson, T. Sphicopoulos and F.E. Gardiol* ABSTRACT The reflection from an array of narrow series slots on the broad face of a rectangular waveguide is used in order to determine the dielectric properties of the medium into which the slot

DETERMINATION A TEM-LINE T. EGE* OF THE PROPAGATION CONSTANT OF THE WAVES TRAVELING ALONG SERIES LOADED WITH LUMPED CAPACITORS PERIODICALLY ABSTRACT Two different methods for the analysis of the wave propagation along a TEM-line periodically series loaded with lumped capacitors is presented. The first method is based upon transmission line theory and a perturbation technique to estimate the com

A NEW VOR-ANTENNA IN SLOT-TECHNOLOGY G Grevlng~ ' . + H.Wurt h ., + A B S T R ACT The general necessity for an improved VOR-antenna is outlined and the related specifications are summarized. The development and the design of a new VOR-antenna is described. The basic theory and the resulting radiating elements are discussed and the hardware resulting~ an array of staggered loop antennas

ANNULAR-RING AND CIRCULAR-DISC MICROSTRIP ANTENNAS WITH & WITHOUT AIR GAPS K. F. Lee, J. S. Dahele and K. Y. Ho * ABSTRACT A systematic study is first presented on the impedance bandwidth characteristics of the first few modes of the annular ring and the circular disc micros trip antennas. It is then established, both experimentally & theoretically, that the resonant frequencies can be t

ANALYSIS OF RADIATION FROM WAVEGUIDE ARRAYS ON METALLIC CYLINDERS, INCLUDING MUTUAL COUPLING EfFECTS R W Wills* ABSTRACT Arrays of open ended rectangular waveguides in metallic cylindrical surfaces are considered. An analysis which uses mode matching at the cylinder surface to derive inter-element coupling coefficients is described, and some results are presented. The analysis is then radiated fa

THE PERFORMANCE OF GaAs LUMPED ELEMENT PHASE SHIFTERS AT SAND C BAND C.W. Suckling, P.N. Rigby, T. Bambridge, R.S. Pengelly, R.S. Butlin ABSTRACT The design and performance of an S-band analogue/digital phase shifter GaAs IC chip set, developed for use in a phased array radar transmitter, will be described. The circuits have been used to demonstrate successfully the feasibility of using G

PROXIMITY LOGIC EFFECTS OF INTERCONNECTION LINES IN HIGH SPEED INTEGRATED CIRCUITS J. CHILO*, G. ANGENIEUX*, C. MONLLOR* ABSTRACT The proximity and coupling effects between interconnection lines in V.S.L.I. circuits are studied by evaluating the power in the circuit. The coupling and propagation matrices and the exact current distribution in the conductors are established. The results o

THE PREDICTION AND CHARACTERISATION OF COUPLING BETWEEN TRANSMISSION LINE STRUCTURES TO ENHANCE CAD OF MMIC GaAs CIRCUITS H.J. Finlay, J.A. Jenkins, R.S. Pengelly ABSTRACT A major design requirement for many GaAs ICs is a knowledge of the coupling properties between various conductor and transmission line subcircuits. Networks of different geometries have therefore been accurately asses

A QUASI-MONOLITHIC APPROACH TO MICROWAVE Ga-As INTEGRATED CIRCUITS E. M. Bastl' da , G. P. Donze x 'X 111, xx G. G h lone, ' 'XX C. Na ld 1 ABSTRACT A new class of microwave integrated circuits is presented, having definite advantages over both the hybrid and the fully monolithic solutions. A theoretical analysis correlating the S parameters of a flip-chip mounted FET device with those