PHASE LOCKING MILLIMETERWAVE IMPATT OSCILLATORS BY LOW FREQUENCY SIGNAL INJECTION A. Rydberg, * E. Kollberg * ABSTRACT A method is described for phaselocking a low Q mill imeter wave IMPATT through the bias circuit at a frequency much lower than the output frequency. The frequency of the injected signal is close to the frequency of a spurious oscillation observed in the bias circuit a

A HIGH EFFICIENCY FREQUENCY TRIPLER FOR 230 GHz N. R. Erickson* ABSTRACT A high efficiency tripler is described covering the 195-235 GHz range ~ith a peak efficiency of 10.5%. Maximum efficiency occurs for an input power of 15-30 mW. Maximum output power over most of this range is 3-4 row. Construction is fairly simple and uses a coaxial choke for ease of assembly. Work with a 100 GHz scal

ON THE OPTIMIZATION OF CRYOGENIC MIXERS H. Zirath* and E. Kollberg* ABSTRACT Measurements on cooled mm-wave Schottky diode mixers are presented. From embedding impedance measurements and knowledge about the diode properties a theoretical analysis is performed, which in general agrees well with the experiments. It is shown that it is possible to design a mixer with optimum noise properties wit

A SEARrn FOR 1HE OPTIMUM MOUNT OF A CRYOGENIC SrnOTTKY MIXER AT MM-WAVES Antti V. Raisanen and Arto o. Lehto ABSTRACT An improved model for the impedance seen by the diode in a millimeter waveguide mixer mOlmt has been developed using a low frequency mount. The developed impedance model has been proven to be sufficient to give a good agreement between calculated and experimental noise performan

A VERY LOW NOISE QUASIPARTICLE (818) MIXER RECEIVERIFOR RADIO ASTRONOMICAL APPLICATIONS L. Olsson*, S. Rudner**, E. Kollberg*, C.O. Lindstrom* ABSTRACT A Superconducting quasiparticle mixer receiver for 35-50 GHz is described. An array of six Pb In-oxide-PbO.7BiO.3 tunnel junctions with 40 ~ array normal resistance and a shunt capacitance of 0.2 pF is used. The mixer is immersed into

PARAMETRIC AMPLIFICATION WITH SIS JUNCTIONS G. S . Lee '/( ABSTRACT The nonlinear reactance of an SIS junction may be exploited to construct a parametric amplifier. It is possible to sample the reactive nonlinearity while discriminating against the resistive nonlinearity. The only noise is therefore the input quantum noise ~. 

SLOW-WAVE AND COPLANAR MONOLITHIC GaAs CIRCUITS E. M. Bastida, P. Bergamini, G. P. Donzelli, N. Fanelli ABSTRACT The major results of a study aimed at reducing the monolithic microwave circuit size are presented. The paper first reports the design and performances of new low-coupling coplanar circuits, which are suitable for both monolithic and hybrid applications and show a very flat cou

THE DESIGN OF MULTIPORT COMBLINE DIRECTIONAL COUPLERS. B.A.Herscher * and J.E.Carroll * Abstract This work concerns a new design technique [1] where the phase and amplitude of a combline directional coupler with an arbitrary number of lines may be constrained to taking a desired form over a specified design bandwidth. Using this new method we have designed and constructed broadband microw

POWER DISTRIBUTION IN MICROWAVE COUPLERS O. Schwelb* ABSTRACT Analytical treatment is presented for lossy uniform and for tapered and chirped nonuniform couplers. Emphasis is placed on the coupling matrix and the transfer matrix of the coherency and Stokes vectors, which record the evolution of the power flow within the coupler. The interrelationships between these matrices are given and thei

AN EFFICIENT METHOD FOR SYNTHESIZING SYMMETRICAL DIRECTIONAL COUPLERS WITH A LARGE NUMBER OF SECTIONS Bengt Ulriksson* ABSTRACT An efficient method for synthesizing symmetrical directional couplers of the coupled transmission I ine type has been developed. The basic operation is a transformation of the coupl ing from the frequency domain to the time domain, where the coupl ings of the indiv