Giancarlo Bartolucci

MIM capacitor modeling: a planar approach

On the basis of a planar approach, an equivalent circuit model of MMIC overlay capacitors with feeding lines in generic position has been derived. Closed expressions for the equivalent circuit elements are presented. The validity of the proposed circuit has been successfully tested with experimental data. Its simplicity and flexibility makes it attractive for implementation in CAD packages. >

An equivalent-circuit model for shunt-connected coplanar microelectromechanical system switches for high frequency applications

In this paper, a circuit model to predict the microwave response of a shunt-connected capacitive microelectromechanical coplanar switch is proposed. The numerical values of the lumped elements composing the equivalent circuit are computed by means of a fully analytic approach. In particular, the contribution of resistive and inductive parasitic elements has been evaluated by using closed-form expressions. Configurations characterized by different technological solutions have been obtained and modeled. Simulations performed with the proposed approach correlate very well with actual measurements.

Equivalent circuit models for computer aided design of microstrip rectangular structures

Microstrip rectangular structures are modeled in terms of equivalent circuits in order to overcome many of the drawbacks and limitations of previously proposed approaches and the poor accuracy still introduced by most of the presently available models. Through a successful electromagnetic approach, lumped element models for interacting and noninteracting step discontinuities have been created and tested. An alternative model is also proposed to account for shunt connected double and single stubs in cross and tee junction with the main line, respectively. The different models have been tested on the same structure to demonstrate their congruency. >

A magnetostatic wave oscillator for data relay aatellite

In this paper the design, realization and test of a magnetostatic wave oscillator working at 14 GHz for possible use in data relay systems for ground and satellite applications is presented. Power levels as high as 4 dBm and a tuning bandwidth of 500 MHz have been designed and obtained.

Analytic Modeling Of RF MEMS Shunt Connected Capacitive Switches

Abstract —This paper deals with a general analytic approach for the design of RF microelectromechanical system (MEMS) switches. The chosen configuration for these microwave devices is composed of twocoplanar transmission line sections separated by a metal membrane providing a shunt connected variable impedance. Using a bias voltage it is possible to actuate the switch. The adopted methodology for the development of the circuital model is based on the image impedance parameter representation of a two-port network. Synthesis equations are presented, and design considerations are discussed. The proposed approach is validated by means of electromagnetic simulations.

RF MEMS ohmic switches for matrix configurations

Two different topologies of radio frequency micro-electro-mechanical system (RF MEMS) series ohmic switches (cantilever and clamped–clamped beams) in coplanar waveguide (CPW) configuration have been characterized by means of DC, environmental, and RF measurements. In particular, on-wafer checks have been followed by RF test after vibration, thermal shocks, and temperature cycles. The devices have been manufactured on high resistivity silicon substrates, as building blocks to be implemented in different single-pole 4-throw (SP4 T), double-pole double-throw (DPDT) configurations, and then integrated in Low Temperature Co-fired Ceramics (LTCC) technology for the realization of large-order Clos 3D networks.

A generalized lumped element modeling of magnetostatic wave resonators

A lumped element modeling of a typical distributed electromagnetic structure, namely a band-stop magnetostatic wave resonator, is presented here and validated by experimental results. The definition of a turns ratio and data on the quality factor of the resonator versus frequency allow a wideband approach to the prediction of its performances between 1 and 12 GHz.

Composite Right / Left Handed (CRLH) Based Devices for Microwave Applications

Stefan Simion‡, Romolo Marcelli*, Giancarlo Bartolucci#, Florea Craciunoiu‡, Andrea Lucibello*, Giorgio De Angelis*, Andrei A. Muller‡, Alina Cristina Bunea‡, Gheorghe Ioan Sajin‡ ‡National Institute for Research and Development in Microtechnologies, Bucharest, Romania * CNR – Institute for Microelectronics and Microsystems, Rome Italy # University of Rome “Tor Vergata”, Department of Electronics Engineering, Rome Italy

Modelling, design and realization of micromachined millimetre-wave band-pass filters

This paper describes the design, the realization and the experimental characterization of a micromachined band-pass filter with a working frequency of 38GHz. The synthesis of the structure has been carried out by means of the image parameter representation of two-port networks. A coupled line coplanar configuration has been adopted for the filtering network. The good agreement between theoretical and experimental results demonstrates the validity of the proposed design approach. Copyright

Coplanar waveguide stub/filters on thin membranes and standard substrates

Several coplanar waveguide series stubs and filter structures based on such stubs were designed and manufactured on standard semiinsulating GaAs substrates and thin GaAs membranes as well as on silicon based thin dielectric membranes. Coplanar waveguide circuits realized on thin membranes offer significant advantages over conventional coplanar or microstrip lines for monolithic or hybrid MIC applications.