有極形デュアルモードループ共振器フィルタにおける入出力直接結合の周波数依存性のフィルタ設計への応用 (マイクロ波)  [in Japanese] Application of Frequency-Dependent Direct Source/Load Coupling to Design of Dual-mode Loop Resonator Filter with Transmission Zeros  [in Japanese]

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Author(s)

Abstract

飛び越し結合や入出力直接結合を利用したフィルタの有極化は,スカート特性の急峻化に必要不可欠である.しかし,回路合成理論によると生成できる伝送零点の数Nは共振器段数によって決定されるため,より急峻な減衰特性を得るためには共振器段数を増やさなければならず,低損失特性と急峻な減衰特性の両立には合成理論上の限界があった.そこで本稿では,入出力直接結合量の周波数依存性を利用して(N+1)個の伝送零点を実現する有極形フィルタの設計手法を提案する.そのため,デュアルモードループ共振器フィルタについて入出力直接結合が周波数依存性を持つことを示すとともに,その結合メカニズムと周波数依存性の調整機構について明らかにする.提案手法の適用例として,合成理論の上限値2個を超える合計3個の伝送零点を阻止域に持つデュアルモードループ共振器フィルタの設計を行い,提案手法の有効性を検証している.

In microwave filter design, transmission zeros (TZs) generated by cross couplings and/or a direct source/load (S/L) coupling at stopbands are indispensable for a sharp passband response. According to a synthesis theory of transversal array filters, however, the maximum number N of TZs that can be provided at stopbands has a theoretical limitation because it is determined by the number of resonators. To produce (N+1) TZs for both a sharper passband skirt and larger stopband attenuations without increasing the number of resonators, this paper introduces a frequency-dependent direct S/L coupling to design of a multi-mode filter. To realize such a novel idea, a coupling mechanism of the frequency-dependent direct S/L coupling in a dual-mode loop resonator filter is made clear by a circuit simulation. Moreover, it is numerically shown that the frequency-dependent direct S/L coupling can be easily controlled without any additional structural parameters. As an example, we design a dual-mode loop resonator filter with three TZs at an upper stopband, which validates the proposed technique of the TZ generation.

Journal

  • IEICE technical report. Microwaves

    IEICE technical report. Microwaves 113(365), 7-12, 2013-12-19

    The Institute of Electronics, Information and Communication Engineers

Codes

  • NII Article ID (NAID)
    110009903021
  • NII NACSIS-CAT ID (NCID)
    AN10013185
  • Text Lang
    JPN
  • ISSN
    0913-5685
  • NDL Article ID
    025143506
  • NDL Call No.
    Z16-940
  • Data Source
    NDL  NII-ELS 
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