CONDUCTOR-LOSS LIMITED STRIPLINE RESONATOR AND FILTERS

We report on stripline resonators on thin dielectric membranes that sh ow dispersion-free, conductor-loss limited performance at 13.5 GHz, 27 .3 GHz, and 39.6 GHz, The unloaded-Q (Q(u)) of the resonators increase s as root f with frequency and is measured to be 386 at 27 GHz. The me asured results agree well with a new conformal mapping analysis, The s tripline resonators are used in a micromachined state-of-the-art plana r interdigitated bandpass filter at K-band frequencies, Excellent agre ement has been achieved between the microwave model at 850 MHz and the 20 GHz filter. The micromachined filter exhibits a passband return lo ss better than -15 dB and a conductor-loss limited 1.7 dB port-to-port insertion loss (including input/output CPW line loss) at 20.3 GHz.