Raymond Crampagne

A Simple Method for Determining the Green's Function for a Large Class of MIC Lines Having Multilayered Dielectric Structures

To find the characteristic parameters of the wave propagation in microstrip structures, several Greens function methods have already been developed, corresponding to particular geometric configurations. In this paper, three of these methods are synthesized, showing that the final equations in the different cases are identical. Moreover, using the transverse transmission line theory, the Greens function is solved numerically for an N-layer dielectric structure.

Quarter wavelength side-coupled ring filters for V-band applications

Designs of three bandpass filters based on quarter wavelength side-coupled ring resonator are presented for V-band applications. Centered at around 60 GHz with three different bandwidths of 2.4%, 6.2% and 11.27%, the filters are designed on a 25-mum-thick benzocyclobutene (BCB) substrate deposited on a 400-mum-thick silicon bulk. In the filter designs, three technology configurations involving multilayer microstrip and coplanar waveguide (CPW) environment are considered to achieve flexibility in coupling. Results from electromagnetic simulations of the filters are presented through this paper.

Meander and interdigital lines as periodic slow-wave structures. Part I. Characteristics of waves propagating along an infinite array

This paper consists of two parts. In part I, in a quasi-TEM approximation, the complex charge and potential distributions are determined, and then the other characteristics of an infinite array of parallel strips are analysed. The effects of the coupling, shielding and the dielectric constant of the substrate on the characteristics of the propagated waves ore discussed.

Dispersion characteristics of superimposed microstrip couplers

In the article by Mittra and Itoh (1971), an extremely elegant method for the determination of dispersion graphs of microstrip lines is given. We can show that with the help of certain minor modifications their calculations can be applied to superimposed couplers, providing excellent results which correspond well with those obtained experimentally.

Meander and interdigital lines as periodic slow-wave structure. II. Applications to slow-wave structures

In this part, the dispersion law of meander and interdigital lines is determined by the imposition of the boundary conditions relative to each slow-wave structure. Having established the transmission matrix of the unit cell, the iterative impedance of the line can be found.

Harmonic suppression in low pass filter designed by non uniform transmissions lines

The out band response of filters is of major importance because it mitigates interferences for adjacent applications. In this paper, a novel technique based on non uniform transmission lines (NUTLs) is used to suppress harmonics in the out band of a low pass microstrip filter. Explicit expressions describing accurately the behaviour of NUTLs are obtained from numerical resolution of Hills equation. Practical measurements showed good agreement with simulation results.

Introducing Radio-Wave Propagation with Hypercard

An educational software developed for the introduction to radio-wave propagation is presented. Based on the HyperCard authoring system, the software is designed around the modelization of a classical radio or microwave link. Used in a continuing education program, organized for technicians and engineers involved more in the practical than in the theoretical aspects of propagation, this software greatly helps for the teaching of very short courses.

A study of wave propagation along microstrip lines containing a medium with step inhomogeneities

The characteristic parameters of microstrip lines are calculated by the transverse-transmission-line method to give the Greens function of the problem very easily in a form suitable for numerical treatment. The results are extended to study the permittivity profiles of media having linear or non-linear variations of permittivity in the transverse direction.