Design of a Micromachined Band-Pass Filter with Insertion of the Coplanar Accesses in the Resonator

In this article, the design of a two poles micro-strip micro-machined planar filter is presented at 28 GHz with a 5% bandwidth with an optimization methodology of the quality factor in order to decrease losses. Furthermore this article presents a new connection between the resonators in micro-strip technology and the coplanar accesses. We propose a slot in the quarter wave-length resonator which is directly connected to coplanar input lines. The coplanar to micro-strip transition between the circuit and external accesses is included as a part of the synthesis. This technique is quite easy to achieve and permit to win one step in a filter design.