CORRUGATED WAVEGUIDE FEEDERS FOR MICROWAVE ANTENNAS P.J.B. Clarricoats, A.D. Olver, C.G. Parini and G.T. Poulton ABSTRACT The use of corrugated waveguide as feeders for microwave antennas is discussed. They offer the advantage of a potentially lower attenuation than smooth wall circular waveguides. As circular corrugated waveguide feeders are slightly overmoded, we describe results sh

DIELECTRIC FEEDS FOR REFLECTOR ANTENNAS by K.-P. Dombek *) ABSTRACT Special dielectric antennas used as elements for a feed of multi-beam or limited-scan reflector antennas have been developed. As a result of the close arrangement of the feed elements, their cross-sectional dimensions must be small and their mutual coupling should be as low as possible. On the other hand, the individual elements

IMPROVEr1ENTS IN THE DEVELOPMENT OF COAXIAL FEEDS FOR PARABOLOIDAL REFLECTOR ANTENNAS by H. Scheffer *) ABSTRACT The coaxial feed for front-fed paraboloidal antennas as known from previous papers, by which an increase of aperture efficiency and a decrease of spillover is achieved, was simplified considerably in construction and improved in bandwidth. The aperture field distribution of the feed, w

SPLASH PLATE FEED DESIGN D.P.S. Malik and G.L. James ABSTRACT The theoretical design of splash plate feed systems, where a reflecting plate is situated in front of a radiating aperture, is discussed. Several configurations are investigated and the results compared with experimental data. 

SUBNANOSECOND PULSE TECHNOLOGY AND ITS APPLICATIONS Gerald F. Ross ABSTRACT In this paper we present the current status of subnanosecond pulse technology and its various applications. Specifically, we will discuss the plication of baseband technology to the test and calibration of microwave components and the measurement of the intrinsic properties of materials, the development of a new cla

NEW RADAR AND NAVIGATION SYSTEMS K L Fuller ABSTRACT It is not the intention of this paper to give a complete coverage of all new radar and navigation systems, but to concentrate rather more on specific areas and examples where microwaves are used. Also, general coverage of the radar area is felt to be unnecessary following the invited paper given by R. Voles at Microwave 74, however recent adv

OPTICAL WAVEGUIDES Hans-Georg Unger ~ Summary Dielectric films, strips and ribs on transparent substrates serve as waveguides in planar optics. Made of materials suitable for integration of lines and components into microscopic circuits they are preferably monomode and have less than 1 dB/cm loss. Cladded core and gradient glass fibres transmit optical signals over wide distances with low los



THE MEASURED PERFORMANCE OF A MILLIMETRE.WAVE UNIT' FOR TRUNK WAVEGUIDE COMMUNICATION. FREQUENCY MULTIPLEXING J. Bodonyi* and B. K. Watson* ABSTRACT A rectangular waveguide commutating-hybrid array channelling filter and a centre-excited band branching unit have been combined to form a frequency division multiplexing (f.d.m.) network in the 32-50GHz frequency region. These units terminate the c

LOW-MODE LOW-LOSS WAVEGUIDE FOR THE 100-1000 GHz RANGE R.J. Batt, A. Doswell, D.J. Harris and J.M. Reeves ABSTRACT The characteristics of H-guide have been investigated theoretically and experimentally. A modified form allows support of very thin films across the guide and provides some higher order mode suppression. Measurements at 26-40 GHz by a resonance technique have verified the