Wave Digital Approach-A Different Procedures for Modeling of Microstrip Step Discontinuities (original) (raw)

Direct analysis of wave digital network of microstrip structure with step discontinuities

2008

A microstrip structure, divided into cascade connection of uniform sections, can be efficiently modelled by wave digital network [4]-[7]. Appropriate choice of a section number in digital model of microstrip structures is very important because of direct influence on the sampling frequency of the digital model, and on accuracy of desired response. Also, effects of the identified step discontinuities have to be compensated. In this paper, a choice of minimal number of sections based on given relative error, and one wave digital element for the step discontinuity are presented. Verification of the obtained results is done on one example of lowpass filter.

A Method for Calculating the Frequency-Dependent Properties of Microstrip Discontinuities

IEEE Transactions on Microwave Theory and Techniques, 1977

Afrstract-A method is described for enlcrdating the dynamical (frequency-dependent) properties of varions microstrip discontinuities such as unsymmetrical crossings, T junctions, right-angle bends, impedance steps, and filter elements. The method is applied Ito an unsymmetrical T junction with three different linewidths. Using a wavegnide model with frequency-dependent parameters, a field matching method proposed by Kiihn is employed to compute tlhe scattering matrix of the strictures. The elements of the scattering mntrix calculated in this way differ from those derived from static methods by a bigher frequency dependence, especially for frequencies near tlhe cutoff frequencies of the higher order modes on the microstrip lines. The theoretical results are compared with measurements, and theory and experiment are fonnd to correspond closely.

The rigorous analysis of cascaded step discontinuities in microstrip

IEEE Transactions on Microwave Theory and Techniques, 1988

The Rigorous Analysis of Cascade'd Step Discontinuities in Mlcr os trip Abstruct-A rigorous analysis of boxed microstrip single step discontinuities and cascades of strongly coupled discontinuities is presented. Use is made of a variational formulation involving the expansion of the transverse E field at the step in terms of suitable basis functions. Strongly coupled steps are analyzed using the concept of "localized'' and "accessible" modes and making use of a network model. The method is applied to a five-section low-pass filter.

Microstrip Line Discontinuities Simulation at Microwave Frequencies

Advances in Physics Theories and Applications, 2013

Microwave and Millimeter wave integrated circuits (MICs) have experienced a tremendous growth over the last 50 years. Microstrip line is one of the popular lines in these MICs. Due to the layout necessities, an electromagnetic wave that propagates down a microstrip line may encounter discontinuities such as T-junctions, Bends and vias. A simulation model is presented here for analysing these discontinuities in microstrips through Sonnet Software. The parameters of microstrip lines are determined from the empirical formulae which are based on full wave analysis. The simulation work has been performed on Alumina substrate. The discontinuities are simulated and compensated which gives important results for designing high frequency microwave circuits.

Wave-based Modeling and Analysis of Microstrip Stub-line Structures

2009

The purpose of this paper is to show that the one-dimensional (1D) wave digital approach is suitable for modeling and analysis of stub-line structures. A stub-line structure, divided into uniform sections, can be efficiently modeled by wave digital network (WDN). Frequency response in WDN is obtained by direct analysis of formed block-based network. In the other hand, response can be calculated in the frequency or in the time domain directly from known network function in z-domain. The open T- resonator circuit, proving the response accuracy of the new technique, is given.

Using z-variable Functions for the Analysis of Wave-based Model of Microstrip Stub-line Structure

2009

An efficient method based on transfer parameter approach is proposed to obtain the scattering parameters in z- domain of planar microstrip stub-line structures. A wave digital network (WDN) represents a digital model of the structure. WDN is composed of cascaded uniform segments and three-port adaptors with open stubs connected to their dependent ports. Uniform segments (transmission lines and stubs) are represented by several cascaded unit elements. Also, a simple modeling approach of the T-junction discontinuity which involves changing line lengths is given here. A simulation validation of the proposed modeling and analysis approach is provided by means of an open T-resonator circuit realized in microstrip technique.