An equivalent circuit model for predicting the frequency response of a square ring slot frequency selective surface (SRS-FSS) for normal incidence is described. The proposed FSS consists of an array of square patches centered within a wire grid. The presented circuit model is formed by the impedance of the wire grid that is parallel with the impedance of the patch array, also the mutual couplin...

a complete procedure for the design of w-band low noise amplifier in mmic technology is presented. the design is based on a simultaneously power and noise matched technique. for implementing the method, scalable bilateral transistor model parameters should be first extracted. the model is also used for transmission line utilized in the amplifier circuit. in the presented method, input/output ma...

An object-oriented microwave circuit simulation environment is described. The design of the program is intended to offer flexibility without sacrifying efficiency. Recent developments in object-oriented techniques and in C++ compilers are used to obtain a flexible and robust system ideally suited to the development of a global modeling strategy for the integration of circuit, field, thermal and...

We present a comparison of software tools for microwave circuit simulation from the research and educational view point. We highlight salient features of the tools and their relevance and suitability for research tasks and undergraduate teaching process. The accompanying 3D EM simulation functionality, provided by the tools, is considered as the mean for better understanding circuit models and ...

Analysis and design techniques for designing a lumped-element 3-dB quadrature coupler with wide-band flat coupling are proposed for microwave integrated-circuit/monolithic-microwave integrated-circuit applications. The proposed design technique can produce a coupler with flat coupling over 50% fractional bandwidth, which is wider than the conventional lumped-element design methods. A prototype ...

Superconducting devices are known to produce nonlinear effects. In planar structures, these nonlinearities depend on the current distribution on the strip, which definitely depends on the structure of device. This paper used a numerical method based on 3D-FEM to obtain the current distribution in the open-ends and gaps in the superconducting microstrip structures. This is used to present the no...

—A compact 180° hybrid has been developed for use in balanced SIS mixers. The lumped-element circuit uses superconducting Nb conductors on a 1.4 mm x 0.5 mm quartz substrate and operates over 4-12 GHz. Index Terms—Superconducting microwave devices, microwave integrated circuits, hybrid junctions, lumpedelement microwave circuits, superconductor-insulatorsuperconductor mixers.

We report on the generic classical electric circuit modeling that describes standard single-tone microwave optomechanics. Based a parallel RLC in which mechanical oscillator acts as movable capacitor, derivations of analytical expressions are presented, including key features such back-action force, input-output expressions, and spectral densities associated, all regime. These coincide with qua...