Compact 900 MHz hairpin-line filters using high dielectric constant microstrip line

Several miniature bandpass filters have been developed by accurate modeling of experimental and computer-generated coupling data of hairpin-line microstrip line resonators on high-K (K=80 to 90) substrates. The materials are temperature-stable and of high quality factor. The method discussed is useful for realizing planar filters for cellular radio and global positioning systems, and superconducting microstrip filters.<
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