Planar Slotline Millimeterwave-Resonators with Coplanar Coupling

This paper adresses a new way for optimizing integrated high Q slotline resonators for millimeterwave applications. The procedure is carried out in two steps. First, the problem of coupling of the incident wave into the resonator is solved numerically with the help of orthogonal raw-expansion method. Secondly, the input impedance of the resonator is calculated, and from this an equivalent circuit for a parallel - respectively serial - resonance is optimized. The appicability of the method presented here is shown by measurement. The results of this procedure are used for MMIC applications as for dimensioning filters and even complete oscillators.