C-Band Alumina Microstrip Dual Behavior Resonator Filters
Ralarioely, F
LEST, Brest

This communication reports on the design of a Dual Behavior Resonator microstrip alumina filter in C-band with drastic specifications in terms of size, insertion losses, flatness, rejection and tolerance to technological dispersion.
A DBR filter can usually be considered as an alternative whenever classical planar solutions are unable to solve a given problem. This paper is aimed at showing how to benefit from such a particular planar topology. At first, we will remind you of the basic principle of both, classical and cross-coupled DBR topologies before describing the design of two particular microstrip C-band DBR solutions. The first one is a second order prototype with oversized high frequency stubs and integrated low pass structures, while the second one is a sixth-order cross-coupled symetrical prototype. In the second prototype, the rejection and the fltaness of the group delay are controled through a positive or a negative coupling. At last, electrical-, electromagnetic-simulations, layout and measurements of filters realized on alumina substrate will be presented.
Such a DBR solutions were specifically designed to take place in a C-band receiver aboard a telecommunication satellite to be launched soon.