HIGH CONVERSION DIODES B.M. KRAMER*, EFFICIENCY FREQUENCY MULTIPLIER USING GaAs AVALANCHE A.C. DERYCKE**, C.F. MASSE*, P.A. ROLLAND** ABSTRACT GaAs avalanche diodes for multiplication have been studied from 3 different points of view: theoretical, technological and circuit design, in order to obtain high efficiencies in the mm waveband. The GaAs diode design is explained and compared to

AN "0" BAND FAST PIN DIODE SWITCH A J Paffard * ABSTRACT An "0" band fast PIN diode SPST switch has been developed which has an insertion loss <= 1.0 dB and an isolation >= 25 dB over a 5% bandwidth. Switching speed is ns and estimated power handling is >= 1 watt c.w. The unit is to be used as a modulator in a 60 GHz, 130 megabit/see digital radio data link under development at RSRE Malvern.

lip A NEW TECHNOLOGY LAN FOR HIGH E M E S A S.II POWER STACKED VARACTORS A. CHAPARD* ABSTRACT: II Plane mesa" is the name for a new technology which yelds definite advantages when compared to traditional mesa structure, for straight forward stacking of chips, or for upside down mounting in order to reduce thermal resistances and (or) the series inductance. An example of practical a

LOW CONVERSION LOSSES UP AND DOWNCONVERTERS, USING DIELECTRIC RESONATORS FOR APPLICATION WITH MILLIMETRIC TELECOMMUNICATION SYSTEMS MAHIEU Jean Rene ABSTRACT This paper shows that it is now possible to design devices incorporating dielectric resonators for frequencies up to 40 GHz. Theoretical models have been studied in order to compute with the required accuracy the resonant frequency and coupl

A 14 GHz-LOW NOISE-DOWN-CONVERTER Dieter Dobramysl+) WITH SUM AND IMAGE REJECTION ABSTRACT The design and the experimental performance of a single-ended waveguide-mixer operating at a signal frequency of 14 GHz 14.5 GHz and an IF of 3.7 GHz to 4.2 GHz is reported. The conversion loss over the IF bandwidth of 500 MHz was < 3.5 dB. The optimum load impedance for the mixer diode at the sum frequenc

A LOW-NOISE + RECEIVER FOR 80 GHz + B. Vowinkel, + W. Reinert, K.-H. Gebler ABSTRACT A description of a mixer-receiver designed to operate at 80 GHz with an intermediate frequency of 2.7 GHz is given. An uncooled parametric amplifier is used for IF-amplification. The local oscillator injection is realized by a low-loss ring cavity directional filter. In single-sideband operation a cutoff fil

A SENSITIVE AND PERMANENT JO~EPHSON MIXER FOR MilLIMETER WAVES J. Edrich ABSTRACT A new method to construct permanent Josephson mixers for millimeter waves is described. In contrast to conventional point contacts which are mechanically unstable and require adjustments after each cooldown, these point contact junctions are set at room temperature, stay mechanically stable and can be temperatu

BROADBAND MATCHING OF MICROSTRIP DIFFERENTIAL PHASE SHIFTERS B. Schiek, J. Kohler, W. Schilz ABSTRACT Meanderline phase shifters in microstrip are badly matched (vswr ~ 2), due to the difference in phase velocity of the odd and even mode of the coupled transmission lines. This is overcome by a stepped impedance design, allowing to realize e.g. a 90º phase shifter with a return loss better than 3

ACCURATE ANALYSIS AND DESIGN OF MICROSTRIP INTERDIGITATED COUPLERS Vittorio Rizzoli-- Alessandro Lipparini- Abstract. The electrical behaviour of interdigitated directional couplers in an inhomogeneous dielectric medium is analyzed. Thanks to the symmetry properties of the device, the concepts of even and odd networks can be applied, leading to simple, closed-form expressions for coupler

EFFECTS OF THE EVEN AND ODD PHASE VELOCITY SEPARATION ON THE BANDWIDTH OF NONUNIFORM J.P. Villotte, LINE MICROSTRIP COUPLERS. ~ LIMITATION Y. Garault, D. and J. Rousset ABSTRACT Frequency response of nonuniform line micros trip couplers is given by using a second order theory applied for the even and odd signals which have unequal velocities. This condition leads to finite isolation which beco