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A Miniaturized 2-pole Bandpass Filter with Attenuation Poles  

Kim, Chul-Soo (RRC for Wireless Communication Devices, Soonchunhyang Univ.)
Lim, Jong-Sik (Korean Intellectual Property Office)
Kim, Jong-Hwa (Division of Information Technology Engineering, Soonchunhyang Univ.)
Ahn, Dal (Division of Information Technology Engineering, Soonchunhyang Univ.)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.15, no.6, 2004 , pp. 554-559 More about this Journal
Abstract
A novel miniaturized 2-pole band pass filter(BPF) is proposed and it has an overlapped hairpin and slot structure on the upper and bottom plane of microstrip lines. Due to the overlapped structure of a hairpin and a slot, the size of the proposed BPF is quite smaller than that of a general BPF having coupled lines. The size of the proposed BPF is reduced to 33 % comparing with the conventional λ/4 coupled BPF. The attenuation is improved by controlling the attenuation poles properly using the proposed structure. The proposed 2-pole BPF is fabricated with a narrow bandwidth(69 ㎒) at center frequency, 1.9 ㎓ which is difficult to make that narrow bandwidth in the conventional coupled lines due to impractical spacing. The design method in this paper can be applied to the design of other microwave circuits to reduce the size and improve the performances.
Keywords
Bandpass Filters; Attenuation Poles; Size Reduction;
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