Abstract
AbstractThis article presents a compact hairpin bandpass filter using multilayer stripline folded quarter‐wavelength resonators in a low‐temperature cofired ceramic substrate.Using the new structure designs accomplish the vertical coupling in multilayer system, the size of the proposed filter can be reduced about 50% compared to an equivalent single‐layer hairpin resonator filter. As an example, an L‐band filter centered at 1.10 GHz with a fractional bandwith of 13.5% is designed, fabricated, and measured. The measured results of the fabricated filter agree very well with the electromagnetic simulations. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:2627–2629, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27139
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