A Novel Filter Construction Utilizing HTS Reaction-Type Filter to Improve Adjacent Channel Leakage Power Ratio of Mobile Communication Systems
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概要
- 論文の詳細を見る
We propose a new band selective stop filter construction to decrease the out of band intermodulation distortion (IMD) noise generated in the transmitting power amplifier. Suppression of IMD noise directly improves the adjacent channel leakage power ratio (ACLR). A high-temperature superconducting (HTS) device with extremely high-Q performance with very small hybrid IC pattern would make it possible to implement the proposed filter construction as a practical device. To confirm the effectiveness of the HTS reaction-type filter (HTS-RTF) in improving ACLR, investigations based on both experiments and numerical analyses are carried out. The structure of a 5-GHz split open-ring resonator is investigated; its targets include high-unload Q-factor, low current densities, and low radiation. A designed 5-GHz HTS-RTF with 4MHz suppression bandwidth and more than 40dB MHz-1 sharp skirt is fabricated and experimentally investigated. The measured ACLR values are improved by a maximum of 12.8dB and are constant up to the passband signal power of 40dBm. In addition, to examine the power efficiency improvement offered by noise suppression of the HTS-RTF, numerical analyses based on measured results of gallium nitride HEMT power amplifier characteristics are conducted. The analyzed results shows the drain efficiency of the amplifier can be improved to 44.2% of the amplifier with the filter from the 15.7% of the without filter.
- （社）電子情報通信学会の論文
- 2009-03-01
著者
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NOJIMA Toshio
Graduate School of Information and Technology, Hokkaido University
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Hikage Takashi
Hokkaido Univ. Sapporo‐shi Jpn
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Hikage Takashi
Graduate School Of Engineering Hokkaido University
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Hikage T.
Graduate School Of Information Science And Technology Hokkaido University
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Hikage Takashi
Hokkaido University
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FUTATSUMORI Shunichi
Graduate School of Information Science and Technology, Hokkaido University
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AKASEGAWA Akihiko
Fujitsu Ltd. & Fujitsu Laboratories Ltd.
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NAKANISHI Teru
Fujitsu Ltd. & Fujitsu Laboratories Ltd.
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YAMANAKA Kazunori
Fujitsu Ltd. & Fujitsu Laboratories Ltd.
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Nakanishi Teru
Fujitsu Limited & Fujitsu Laboratories Ltd.
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Nojima Toshio
Graduate School Of Information Science And Technology Hokkaido Universitygraduate School Of Informat
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Yamanaka Kazunori
Fujitsu Limited & Fujitsu Laboratories Ltd.
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Yamanaka Kazunori
Fujitsu Laboratories Ltd.
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Akasegawa Akihiko
Fujitsu Limited & Fujitsu Laboratories Ltd.
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Akasegawa Akihiko
Fujitsu Ltd. & Fujitsu Laboratories Ltd.
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Futatsumori Shunichi
Graduate School Of Information Science And Technology Hokkaido University
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Yamanaka Koji
Fujitsu Limited & Fujitsu Laboratories Ltd.
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Nojima Toshio
Graduate School Of Information And Technology Hokkaido University
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Nojima Toshio
Hokkaido Univ. Sapporo‐shi Jpn
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