MICROWAVE DIRECTIONAL FILTER USING SUSPENDED DIELECTRIC RESONATORS M. L. Majewski ABSTRACT A novel simple realization of the directional filter using dielectric resonators suspended between two single microstrip lines has been described. The structure of the proposed filter allows easy coupling adjustment and frequency tuning by means of changing the distance between the two microstrip lin

A WAVEGUIDE FILTER AS LOW LOSS DELAY DEMODULATION Luciano ACCATINO, Roberto SALAROLI ELEMENT FOR DIRECT DCPQSK ABSTRACT A waveguide delay element for direct DCQPSK demodulation operating at 14 GHz is presented. A temperature stable 16.7 ns delay is achieved by a single linear phase dual-mode filter. The device shows a compactness and hightness comparable with a microstrip solution, but displays

LINEAR-PHASE STRIPLINE FILTER K. T. Jokela ABSTRACT A realization of narrow-passband planar printed circuit microwave filter having real and complex transmission zeros is presented. The filter consists of two symmetric capacitively coupled resonator chains which are coupled inductively together. These filters can be used in applications where an efficient phase-equalization together with amplit

A QPRS 140 Mb/s DIGITAL RADIO RELAY SYSTEM IN THE 11 GHz BAND G.J. Sundal*, S.J. Knapskog+, V. Ringset+ 1. ABSTRACT A high-capacity digital radio relay system operating band has been developed and tested in the laboratory. method used is Quadrature Partial Response Signalling system is designed to use the existing frequency plan band according to CCIR rec. 387-3, giving an overall tion of 3.0

LARGE USING CAPACITY 16QAM DIGITAL RADIO SYSTEMS and 8PSK MODULATION SEIJIRO YOKOYAMA ABSTRACT: This paper is a report on the features and performances of the digital radio systems using 16QAM and 8PSK developed for large capacity trunking systems. A study on interference is one of the topics in this paper. Digital to digital and digital to analog interferences are discussed on the basis o

LOW NOISE MICROWAVE RECEIVERS FOR RADIO APPLICATION A. Giavarini * - M. Idi * - F. Marconi * ABSTRACT After a survey line criteria field on "image from effect recovery" microwave mixers, the paper presents a complete ers using Design 2 to 11 GHz of new transistor low noise wide-band microwave recei~ preamplifier. are shown. and achieved performances 

TECHNOLOGY FOR A 29 GHz LOCAL DISTRIBUTION RADIO B C Barnes, B L Clark, W Thorpe ABSTRACT A microwave link equipment for the 27.5-29.5 GHz frequency band is being developed by British Telecom for use in the Local Network. To keep the equipment cost compatible with single subscriber service microwave integrated circuit techniques are exploited. Narrowband filters at 29 GHz have been produced with g

ODD-DEGREE PSEUDOELLIPTICAL PHASE-EQUALIZED FILTER WITH ASYMMETRIC BAND-PASS BEHAVIOUR L.F. FRANTI * - G.M. PAGANUZZI* ABSTRACT The paper considers an odd-degree band-pass filter with a single real-frequency attenuation pole and one pair suitable for single-sideband selection. of complex-frequency transmission zeros. The design is particularly band-pass filters For stated phase and ampl

ASYMMETRIC SYNTHESIS DAVID CHAl1BERS J. DAVID HHODES ABSTRACT This paper details a synthesis procedure suitable for realisation in a number of microwave media, and which allows attenuation poles to be placed on one side of the passband of a filter. This greatly increases the selectivity of the device on that side of the passband. An example is given of a sixth degree waveguide filter with two

THE DESIGN OF MlCROSTRlP DIRECTIONAL COUPLERS USING EXPONENTIAL LINES M.l. Sobhy*and E.A. Hosny+ Abstract: Accurate formulas are derived for the scattering parameters coupled exponential transmission lines (CETL) in inhomogeneous media. formulas are used to design wide-band directional couplers. Practical measurements on designed couplers prove the accuracy of the derived formulas. of