M. Aubourg

Coupled Pade approximation-finite element method applied to microwave device design

In this paper, a fast and rigorous analysis method is presented, combining the Pade approximation and a finite element method. The method is applied to the design of two microwave devices: a narrow band bandpass filter and a broadband microwave module. The accuracy of this approach is demonstrated by the good agreement between the coupled Pade approximation-finite element analyses and the standard finite element ones, and also between the coupled Pade approximation-FE analysis and the experimental filter response.

A full electromagnetic CAD tool for microwave devices using a finite element method and neural networks

A relevant automated electromagnetic (EM) optimization method is presented. This optimization method combines a rigorous and accurate global EM analysis of the device performed with a finite element method (FEM) and a fast analytical model deducted from its segmented EM analysis applying a neural network approximation. First we present our optimization tools, then we describe our full EM optimization method with the definition of the analytical model. Afterward, we apply it to optimize three volumetric dielectric resonator (DR) filters, considering the novel topology of the dual-mode filter. The accuracy of this automated method is demonstrated considering the good agreement between theoretical optimization results and experimental ones. Copyright

Topology optimization applied to the design of a dual-mode filter including a dielectric resonator

The finite element method is coupled with the topology gradient method for optimizing the shape of microwave components using a numerical model. The approach, which consists in minimizing a cost function with respect to the physical property of individual topological elements, is first described. Regarding given electrical specifications, the technique is applied for optimizing the distribution of dielectric material in 3D in order to improve the behavior of a classical dual-mode filter including a dielectric resonator.

Whispering gallery dielectric resonator filters

This paper discusses the utilization of whispering gallery mode dielectric resonators for the design of filters at high frequencies. The analysis based on the three dimensional finite element method makes it possible to predict the theoretical responses of filters. Two kinds of filters are presented. The first one is a volumic one and uses two resonators placed in a metallic cavity and coupled to two electric probes. The second one is a planar one and is the association of elementary electric devices which are composed of a dielectric resonator coupled to two parallel microstrip lines.

Microwave module design applying a global electromagnetic analysis

In this paper, an active microwave module containing three MMICs is studied. Our objective is to analyse the MMIC radiation influence on module response. The finite element method is applied to perform a global electromagnetic analysis of the module distributed area. Then, we determine the effect of a metallic boundary placed between MMICs, which permits a decrease in the indirect interferences between these circuits.

Three dimensional finite element method applied to dielectric resonator devices

The three-dimensional finite-element method is used to evaluate the electromagnetic and electrical parameters of a TE/sub 01 delta / cylindrical dielectric resonator (DR) housed in a parallelepiped metallic enclosure. The case of free oscillation is investigated. Numerical results concerning resonant frequencies, field vectors, and coefficients of coupling between two adjacent DRs are presented.<<ETX>>

Bulk acoustic wave resonators 3D simulation

This article discusses numerical simulations of thin film bulk acoustic wave resonators. FBAR simulation with 1D analytical model permits to quickly determine resonator layers thicknesses that correspond to the objective resonant frequency. 3D finite elements method permits to investigate the effect of the electrode shape on the spurious modes that are present in the electrical impedance. In order to reduce or to suppress those modes, solutions have to be investigated.

3D simulation of thin-film bulk acoustic wave resonators (FBAR)

This article discusses numerical simulations of thin film bulk acoustic wave resonators. FBAR simulation with 1D analytical model permits to quickly determine resonator layers thickness that correspond to the objective resonant frequency. 3D finite element method permits to investigate the effect of the electrode shape on the spurious modes that are present in the electrical impedance. In order to reduce or to suppress those modes, solutions have to be investigated.

Shape optimization design and ceramic stereo-lithography process dedicated to microwave component manufacturing

In this paper, the topology gradient is applied in 3D for optimizing the shape of dual-mode dielectric resonators, and improving the electrical behavior of these classical filter components. Reference and optimal dielectric resonators are then fabricated by a 3D ceramic stereolithography process.

Advanced Design and Manufacturing of Microwave Components Based on Shape Optimization and Ceramic Stereolithography Process

A design technique based on a shape optimization strategy (topology gradient algorithm) and a 3D ceramic stereolithography process are described in this paper. Our goals are to propose innovative components in terms of electric performances and topologies, by using these two approaches together. Several components have been designed, manufactured and tested with success. An example is given for the design of microwave filters including dielectric resonators.