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

Abstract

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 dielectric constant (E, = 80 and 90) substrate. The materials are temperature stable and of high quality factor. The experimental results show excellent filter shapes and some novelty of the design approach. Besides the experimental results, this article also presents the curves and semiempirical models for the coupling coefficients between hairpin-line resonators for two different dielectric materials and thicknesses. The method and the results will be useful in realizing compact planar filters for cellular radio, global positioning systems and superconducting microstrip filters.

CAD of high-?r microstrip bandpass filters

“…This is time consuming and costly and may not be possible if only a limited amount of substrate material is available. Pramanick [8] has described another procedure specifically for the design of microstrip hairpin bandpass filters on high-ε r substrates. In this case, theoretical design curves for k j j+1 and Q e are derived by modeling individual resonator elements using a variety of numerical methods.…”

Design and Fabrication of Two Switch Superconducting Microstrip Hairpin Filters Using Series MEMS Switches

“…Four dc voltage actuated MEMS switches along with corresponding voltage ports/tabs were set at the extremes of the hairpin filters to allow the device to switch. The pass-band ripple was designed to be 0.5-dB according to the Chebyshev filter polynomials [20]. SONNET simulations were carried out with various coupling spacing and tap position, " " in order to obtain an optimized coupling coefficient and quality factor, " ".…”