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J Electromagn Eng Sci > Volume 8(1); 2008 > Article
Journal of the Korean Institute of Electromagnetic and Science 2008;8(1):12-16.
DOI: https://doi.org/10.5515/JKIEES.2008.8.1.012   
A Miniaturized Aperture-Coupled Multilayer Hairpin Bandpass Filter
Han-Ul Moon, Seung-Un Choi, Sang-Won Yun
Department of Electronic Engineering, Sogang University
Abstract
In this paper, we introduce a coupling, which is achieved through the aperture instead of the conventional edge coupling, so that the bandpass filter is reduced less than half in size compared to conventional planar type. The resulting filter configuration has a near two-fold symmetry, where the aperture coupling is used in the middle of the coupling stages. We designed a bandpass filter using two tapped hairpin resonators, of which the order becomes four. The designed bandpass filter has the size of $8.9{times}18.3;mm$. It has the return loss better than 17dB and the insertion loss of less than 5 dB in overall passband. The measured results show good agreements with simulated ones.
Key words: Aperture Coupling, Bandpass Filter, Hairpin Resonator, Size Reduction

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