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High-Tc superconductor microstrip resonator on sapphire substrate (r-cut)
High.Tc superconductor microstrip resonator on sapphire substrate (r.cut) I Vendik* S Gevorgian, D Kaparkov* and A Monin** Abstract Simple expressions in closed form have been used for calculations of propagation parameters of HTS microstrip lines on sapphire substrate (r-cut). The model used was verified experimentally by a measurement of Q-factor and resonant frequency of YBCO microstrip resona
Multiport equivalent circuit model of MIM capacitors
Multiport equivalent MIM capacitors Giancarlo Bartolucci, Franco Giannini, Ernesto Limiti* 5 P Marsh** circuit model of Abstract A lumped-element equivalent circuit model of multiport MMIC overlay capacitors is derived by means of a planar approach. Closed expressions for the equivalent circuit elements are proposed and the validity of the model is successfully compared with experimental data. T
Design and fabrication of low-cost ferrite circulators
Design ferrite Denis C Webb and fabrication circulators . of low-cost Abstract Advances in microwave monolithic integrated circuit (MMIC) technology have resulted in a dramatic reduction in the size and cost of active microwave circuits over the past several years. There have been several factors which have contributed to this success, some of the principal ones being more accurate device and
MMIC circulators covering the frequency range from L- to W-band
MMIC circulators covering the frequency range from L- to W-band D Kother, B Hopf, Th 5porkmann, I Wolff* and 5t KoBlowski** Abstract A new type of circulators is presented which has been tested using circuits covering the frequency range from L- to W-band. This is, for the first time, a principle suitable for applications at 1.8 GHz as well as 77 GHz. At the lower frequencies ferrite drop-in circ
Noise and gain performance of PSA transistor series for personal communication systems vs. emitter number and operating conditions
Noise and gain performance of PSA transistor series for personal communication systems vs. emitter number and operating conditions A Caddemi, M Sannino and C Sclafani- (student) Abstract The booming market of communication system applications in the low microwave range put greater demands on the component performance at lower supply voltages and limited current consumption, as well as on producti
Accurate modelling of cold MESFETs for adaptive MMIC signal processing application
Accurate modelling of cold.MESFETs for adaptive MMIC signal processing application S Lucyszyn* C F Oztek- Yerli and I D Robertson** Abstract At microwave frequencies, variable resistors can be implemented with cold-MESFETs. An accurate ultrawideband model for cold-MESFETs is presented. The equivalent circuit model is based on the physical structure of the device and has a simple topology that req
Modelling of microwave circuits by system identification methods
Modelling of microwave circuits system identification methods Mohamed I Sobhy, EI-Sayed A Bakkar, Ming W R Ng, Essam A Hosny* Bertram Isele, Peter Russer** by Abstract Microwave circuits containing lumped as well as distributed sub-circuits are investigated by a method combining circuit simulation with system identification models. The signal transmission behaviour of the distributed sub-circuit
Characterization and large signal modeling of InP HEMT devices
Characterization and large signal modeling of InP HEMT devices Lars Bengtsson, Mikael Garcia, Christer Karlsson, Niklas Rorsman, Herbert Zirath, and IItcho Angelov Abstract Some recent modeling results of Chalmers manufactured InP HEMT devices are presented in this paper. Device models and measurements as well as comparison to simulation programs are studied. The equivalent circuit and large sign
Experimental verification of a distributed amplifier oscillator
Experimental verification of a distributed amplifier oscillator Lukail Div.na and Zbyn6k .kvor Abstract New electronicallytunable oscillator arrangement, based on a distributed amplifier, has been verified experimentally. The device possesses broadband, continuous and instant tuning and a good harmonic purityof the output signal. It is found suitable to be used in MMICs.
Large-signal Affine representation for nonlinear microwave circuits direct synthesis
Large-signal Affine representation for nonlinear microwave circuits direct synthesis P Colantonio, and E Llmltl F Giannini, G Leuzzl Abstract An exact direct synthesis method for nonlinear microwave circuits is proposed. It makes use of a largesignal affine representation of the nonlinear circuit directly derived from a standard Harmonic Balace analysis. This representation allows direct linear s