Johann Sence

Co-design and co-integration of multiband active antenna arrays for satellite radionavigation systems

This paper presents the structuration and the first results of a research program dedicated to the co-design and the co-integration of a multiband antenna array for a GPS/Galileo receiver. The objective is to develop a novel design approach taking into account all parts of the RF system simultaneously. By this way, the aim is to improve the performances of the RF front-end compared to a traditional approach where RF circuits would be designed separately.

Synthesis method for matching filters

The aim of this paper is to develop an exact synthesis technique for matching filters in connection with the use of single band antennas. A certified algorithm based on Youlas matching theory and convex optimization is presented. A practical example is considered with the synthesis of a matching filter in SIW technology used behind a microstrip patch antenna at 1.5 Ghz.

Optimized synthesis of a microwave equalizer for matching a high performance small antenna

A dual-band RHCP (right-hand circular polarization) microstrip patch antenna is presented for its implementation on a GNSS receiver covering the bands L2, E6 and L1. To improve the total efficiency at the band edges, a dualband equalized is designed by implementing a dual-band filter matched to the complex impedance of the antenna. This filter is composed of two single-band filters, each of them designed to maximize the minimum efficiency in the correspondent band, connected together with input and output junctions. Moreover a microstrip prototype for the dual-band equalizer is designed and fullwave simulations show the equalized efficiency validating the theoretical results.