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http://dx.doi.org/10.5515/KJKIEES.2010.21.1.008

Modified Hairpin Filters Improving the Suppression Performance of Stop-Band  

Kim, Bong-Su (Electronics and Telecommunications Research Institute)
Kang, Min-Soo (Electronics and Telecommunications Research Institute)
Byun, Woo-Jin (Electronics and Telecommunications Research Institute)
Kim, Kwang-Seon (Electronics and Telecommunications Research Institute)
Song, Myung-Sun (Electronics and Telecommunications Research Institute)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.1, 2010 , pp. 8-13 More about this Journal
Abstract
In this paper, a new hairpin type strip-line BPF(Band Pass Filter) improving the suppression performance of unwanted frequency signal is studied. A modified hairpin filter is designed by classical hairpin filter design methodology and is realized by newly placing structure of designed filter. And a newly formed coupled-line effects between modified bilateral symmetry structures make the transmission zeros. Each transmission zeros can shift its frequency to wanted frequency by tuning a certain part of filter. To investigate the validity of this novel technique, an order-5 Chebyshev BPF centered at 9.2 GHz with a 15 % FBW(fractional bandwidth) were used. According to design and measurement results, a good performance of insertion loss of 0.8 dB and unwanted signal suppression of maximum 50 dB is achieved at full input/output ports.
Keywords
BPF; Hairpin; LTCC;
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