Open-circuit Parameters Research Articles

Open-circuit parameters of circulators using side-coupled wye resonators: an impedance pole approach

The open-circuit parameters at the terminals of a circular gyromagnetic region to which triplets of coupling ports and stubs are connected may be written in terms of simple linear combinations of the impedance poles of each symmetrical sextet of ports. As the poles of either problem region are available in closed form the construction of the open-circuit parameters poses no difficulty. The arrangement under consideration is met in connection with the description of a junction circulator using a side-coupled wye gyromagnetic resonator. Once the open-circuit parameters are available, the formulation of the complex gyrator circuit of the junction proceeds in terms of standard matrix operations.

Performance characterisation of a microwave transistor

The maximum transducer power gain GTmax of a bilateral microwave transistor-is analytically expressed in terms of only noise figure F, input-VSWR Vi and the open-circuit parameters mod z mod . The analysis is based on a geometrical approach using the constant noise, input VSWR and gain circles in the source and input impedance planes keeping the solution within the physical bounds. The corresponding source Zs and load ZL terminations are also obtained analytically. Cross-relations among the possible (F, Vi, GTmax) triplets have been utilised in obtaining the performance contours of a microwave transistor at an operating frequency and bias condition. This type of representation of performance promises to be used in data sheets of microwave transistors by manufacturers in forthcoming years.

Open circuit parameters of a magnetostatic forward volume wave straight-edge resonator coupled by orthogonal transducers

An impedance matrix is derived for a magnetostatic forward volume wave straight-edge resonator (MSFVW-SER) coupled by orthogonal strip transducers. This approach provides a theoretical method to predict the MSFVW-SER properties together with the conditions of the operating frequency, the geometrical structure, the saturation magnetization and the linewidth of YIG film. The validity of the method is supported by experiment.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A NEW DEVELOPMENT OF BUS IMPEDANCE BUILDING ALGORITHM CLOSELY RELATED TO BUS ADMITTANCE MATRIX

ABSTRACT The bus impedance algorithm was originally developed in 1960 by Brown, Person, Kirchmayer and Stagg [l], viewing the elements of the bus impedance matrix as open circuit parameters of the network. In this paper an alternative formulation based on simple matrix algebra is presented. Only well established simple results of network matrices are used For any change in the partial network, first, the bus admittance matrix is derived. Then, with proper matrix inversion technique, the corresponding bus impedance matrix is obtained. The development is comprehensive so as to include the effects of mutual couplings, multi line switching, phase shifting components etc.

THEORETICAL AND EXPERIMENTAL INVESTIGATION OF A MICROSTRIP RADIATOR WITH MULTIPLE LUMPED LINEAR LOADS

ABSTRACT A simple theory is developed for the analysis of microstrip patch elements which are loaded at one or more points with lumped linear load impedances. The analysis is based on a cavity model in which the shape of the field distribution between the patch and ground plane is assumed to be well approximated by that of the resonant modes of a corresponding magnetic- and electric-walled cavity. The resonant mode of the loaded cavity is represented as an appropriate superposition of the modes of the corresponding unloaded cavity. The characteristic equation for the resonant frequencies of the loaded cavity is obtained in terms of the load impedances and the unloaded cavity multiport open-circuit parameters. An analysis of the input impedance of a rectangular microstrip element shorted at an arbitrary point has been implemented and the results show good agreement with experiment. An ancilliary result showing the equivalence between a thin strip and a circular cylinder model of a feed current distribution...

Dipole plus parasitic element

Some of the characteristics of a dipole plus a parallel parasitic element have been studied. The variation of resonant length as a function of parasitic spacing has been investigated using matrix inversion methods [1], [2] in conjunction with an iterative technique. Data on resonant resistance, beam patterns, and two-port open-circuit parameters are also given.

Travelling-wave analysis of generalized networks

The behaviour of networks, whether lumped, distributed, active or passive, is analysed from a fundamental travelling-wave point of view. Generalized wave parameters are derived for a 2-port network from which image, conjugate and iterative parameters follow as special cases. The relationship of these to short- and open-circuit parameters are also given.A matrix organization of waves in a multi-port network is next presented, which distinguishes between waves internal and external to the network. Through special transformations, voltage- and powergain matrices are derived and their relationship to the conventional scattering matrix is shown.Finally, a visual representation of the wave trains set up in cascaded stages is given in the form of wave flow diagrams, reminiscent of Mason&apos;s feedback graphs.