MICROWAVE METHOD FOR MEASUREMENT OF FIBER ORIENTATION IN PAPER Martti Tiuri and Pauli Liimatainen ABSTRACT A microwave method for the measurement of fiber orientation in paper, is described. The method uses a dual mode microwave cavity where the modes have equal resonant frequencies and mutually perpendicular electric fields. The paper is inserted through the cavity so that the electric

NON-DESTRUCTIVE REINFORCED By B~rje ABSTRACT MEASUREMENTS BY MEANS OF THE GLASS-FIBRE OF MICROWAVES CONTENT IN PLASTICS Forssell * So far, the usual means of measuring the glass content in glass-fibre reinforced plastics has involved destruction of the material. A new method developed at ELAB allows such measurements to be made non-destructively by means of microwaves. The method is based u

A COMPUTER MODEL FOR THE AND & DYNAMIC DRYING BEHAVIOUR SYSTEMS OF MICROWAVE HEATING E M EL DEEK* R B SMITH* ABSTRACT A general computer model has been developed to investigate the dynamic behaviour of microwave drying and heating of sheet and filamentary materials. It accommodates a variety of waveguide applicator configurations. The input information is the physical properties of the

DESIGN OF RESONANT CAVITIES AS HEATING DEVICES AT 896 MHz AND 345 GHz. A.C.Metaxas * ABSTRACT A new method is presented which employs dimensions of TM0l0 cavities for the heat samples of known dielectric properties. The treat a column of distilled water is described efficiencies and the average electric field water in the 2.45 GHz cavity are obtained a theory to calculate the treatment of cyl

HIGH POWER MULTIPLE IMPATT AMPLIFIERS J. Hughes and K. Wilson ABSTRACT A method of producing high power amplification by combining a number of moderate power Impatt reflection amplifiers is proposed and initial experimental results are reported. Power combination is to be effected by means of a new power combiner, the "Shybrid", which has particular merits making it well suited for this app

A MULTI-STAGE SOLID STATE AMPLIFIER AMARJIT S. BAINS ABSTRACT - A solid state X-band amplifier consisting of five cascaded stages is described. The amplifier is of hybrid type, where combination of high power silicon IMPATT amplifier modules with a Gunn diode preamplifier stage provides an output power of greater than l3.0watts. The gain of the amplifier is 26-dB, with an instantaneous bandwidth

SOLID STATE AMPLIFIERS FOR 3.6 - 4.2 GHz RADIO RELAY Timothy E. Boles, John Walsh, Anthony E. Hilling ABSTRACT & INTORDUCTION The design of microwave amplifiers by systems manufacturers is limited in gain, power output, and especially bandwidth by the parasitic reactances of the transistor packages used in the fabrication of discrete devices. These limitations become more critical as the f

AVALANCHE DIODE AMPLIFIERS FOR MICROWAVE RADIO EQUIPMENT S. F. paik*, G. E. St. John*, and C. J. R. Pallemaertst ABSTRACT Avalanche diode amplifiers (ADAs) with power outputs of 0.5 - 2.0 Watts have been developed for communication systems. Circuit design technique for these ADAs and their performance characteristics in high-capacity microwave communication systems are described. In addit

A 12 GHZ FIELD APPLICATIONS EFFECT TRANSISTOR AMPLIFIER FOR COMMUNICATIONS SATELLITE D.S.James, * R.J.P.Douvi11e, * R.W.Breithaupt, * A.L.VanKoughnett * ABSTRACT The development of a 12 GHz Field-Effect Transistor (FET) Amplifier for use in a communications technology satellite is described. The principal features of Fairchild FMT 941 and P1essey GAT 3 FETs are compared and the perfor

GALLIUM ARSENIDE FIEID EFFECT TRANSISTORS - THEIR PERFORMANCE A1ID APPLICATION UP TO X-BAND FREQUENCIES H.E.G. LUXTON ABSTRACT The microwave performance of GaAs FET's is reviewed and examples of their application in systems operating up to X-band frequencies discussed. Examples of amplifiers (one giving 42 dB gain at 11.2 GHz) and oscillators operating at frequencies hitherto unattain