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

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• 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

• NOJIMA Toshio

  Graduate School of Information and Technology, Hokkaido University

• Hikage Takashi

  Hokkaido Univ. Sapporo‐shi Jpn

• Hikage Takashi

  Graduate School Of Engineering Hokkaido University

• Hikage T.

  Graduate School Of Information Science And Technology Hokkaido University

• Hikage Takashi

  Hokkaido University

• FUTATSUMORI Shunichi

  Graduate School of Information Science and Technology, Hokkaido University

• AKASEGAWA Akihiko

  Fujitsu Ltd. & Fujitsu Laboratories Ltd.

• NAKANISHI Teru

  Fujitsu Ltd. & Fujitsu Laboratories Ltd.

• YAMANAKA Kazunori

  Fujitsu Ltd. & Fujitsu Laboratories Ltd.

• Nakanishi Teru

  Fujitsu Limited & Fujitsu Laboratories Ltd.

• Nojima Toshio

  Graduate School Of Information Science And Technology Hokkaido Universitygraduate School Of Informat

• Yamanaka Kazunori

  Fujitsu Limited & Fujitsu Laboratories Ltd.

• Yamanaka Kazunori

  Fujitsu Laboratories Ltd.

• Akasegawa Akihiko

  Fujitsu Limited & Fujitsu Laboratories Ltd.

• Akasegawa Akihiko

  Fujitsu Ltd. & Fujitsu Laboratories Ltd.

• Futatsumori Shunichi

  Graduate School Of Information Science And Technology Hokkaido University

• Yamanaka Koji

  Fujitsu Limited & Fujitsu Laboratories Ltd.

• Nojima Toshio

  Graduate School Of Information And Technology Hokkaido University

• Nojima Toshio

  Hokkaido Univ. Sapporo‐shi Jpn

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