Abstract
A four-pole elliptic function compact bandpass fllter is designed by using interdigital hairpin resonator and step-impedance hairpin resonator. The miniaturized band-pass fllter is also implemented using high permittivity dielectric substrate. The full- wave simulator IE3D is used to design the compact hairpin resonator, and to calculate the coupling coe-cient of the basic coupling strictures. The responses of the fabricated fllters using Al2O3 (r = 9:7, Q £ f = 350000GHz) and 0.6Sm(Co1=2Ti1=2)O3-0.4CaTiO3 (r = 37, Q £ f = 43000GHz) dielectric substrates are designed at a center frequency of 2GHz. The size of the compact hairpin fllter using 0.6Sm(Co1=2Ti1=2)O3-0.4CaTiO3 ceramic substrate, as compared to that of a compact hairpin fllter using Al2O3 ceramic substrate, is reduced in size by 45%. The compact size and good agreement have been obtained between simulations and implementation results.
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