High dielectric constant strip line band pass filters

High dielectric constant (K=38) strip line was employed to realize selective bandpass filters. Seven-pole gap coupled filters centered at 6.04 GHz and 8.28 GHz were designed for 140 MHz 3-dB bandwidths. The data show excellent agreement without the need for tuners. Miniaturization of high performance filters is demonstrated. This technique is applicable to MMIC-based microwave systems. >