Electrical and Frequency Characteristics of Third-Overtone Vibration-Mode Surface Mount Device High-Frequency Filter Using Modified PbTiO3 Ceramics
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概要
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In this study, a 3rd-overtone thickness-vibration-mode surface mount device (SMD) filter was manufactured using modified PbTiO3 system ceramics for application as an intermediate frequency (IF) filter with a split electrode and gap size. To investigate the effects of the split electrode and gap size on the filter characteristics of the 3rd-overtone-mode energy-trapped filter, ceramic wafers were fabricated by etching split rectangular electrodes with sizes ($b \times d$) of $b=0.4$, 0.6, 0.8 and 1 mm, $d=0.3$, 0.4, 0.5 and 0.6 mm and gap sizes ($c$) of the $c=0.2$, 0.3, 0.4 and 0.6 mm, respectively. Then, SMD ceramic filters were fabricated with the size of $3.7 \times 3.1$ mm2. SMD ceramic filter with the size of $b=0.8$ mm, $d=0.4$ mm and $c=0.4$ mm showed insertion loss of 2.951 dB, 3 dB bandwidth of 54.7 kHz and 20 dB stop bandwidth of 129.27 kHz. Also, these two filters were cascaded and their bandwidth characteristics were investigated by varying the coupling capacitance to check their applicability as high frequency band-pass filters. The cascaded filter showed a higher stop band, reduction of spurious response and increase of selectivity. With increasing coupling capacitance, insertion loss increased but spurious response decreased. The cascaded filter with a coupling capacitance of 15 pF showed insertion loss of 5.643 dB, 3 dB bandwidth of 55.089 kHz and 20 dB bandwidth of 83.608 kHz.
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
- 2003-09-15
著者
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Kim Jongsun
Samsung Electra-mechanics Co. Ltd.
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LEE Suho
Department of Electrical Engineering, Kyungsung University
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JEONG Yeongho
Korea Electric Power Corporation
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Oh Dongon
Department Of Electrical Engineering Semyung University Jechon
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Yoo Juhyun
Department Of Electrical Engineering Semyong University
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Yoon Hyunsang
Department Of Electrical Engineering Kyongmoon College
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Oh Dongon
Department of Electrical Engineering, Semyung University Jechon, Chungbuk 390-711, Korea
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Yoon Hyunsang
Department of Electrical Engineering, Kyungmoon College, Pyongtaek, Kyungkido 390-711, Korea
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Ryu Sunglim
Department of Advanced Materials Engineering, Chungju National University, Chungju, Chungbuk 380-702, Korea
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Ryu Sunglim
Department of Materials Science and Engineering, Chungju University, Chungju Chungbuk 380-762, Korea
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Yoo Juhyun
Department of Electrical Engineering, Semyung University Jechon, Chungbuk 390-711, Korea
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Lee Suho
Department of Electrical Engineering, Kyungsung University, Busan 608-736, Korea
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Kim Jongsun
Samsung Electro-Mechanics Co., Ltd, Suwon, Kyunggi-Do 442-743, Korea
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