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Tailoring of higher‐order mode suppression in a high‐power alternative to classical waffle‐iron filters
Author(s) -
Teberio Fernando,
Arregui Iván,
Arnedo Israel,
Chudzik Magdalena,
Jost Rolf,
Görtz FranzJosef,
Lopetegi Txema,
Laso Miguel A. G.
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28751
Subject(s) - band stop filter , filter (signal processing) , mode (computer interface) , harmonic , power (physics) , prototype filter , control theory (sociology) , low pass filter , microwave , plane (geometry) , filter design , process (computing) , electronic engineering , passband , band pass filter , engineering , computer science , physics , mathematics , acoustics , electrical engineering , telecommunications , geometry , control (management) , quantum mechanics , artificial intelligence , operating system
In this article, a novel stepwise technique for the design of high‐power low‐pass harmonic filters is proposed. The fundamental and higher‐order mode suppression process is divided into three different steps. In the first step, the fundamental TE 10 ‐mode rejected band is accomplished by adjusting the height of E‐plane bandstop elements along the propagation direction. In the second step, this arrangement of bandstop elements is made two‐dimensional to suppress the higher‐order TE n0 modes. Finally, the higher‐order non‐TE n0 modes are rejected by controlling the minimum mechanical gap of the filter. The design process ends after the first, second, or third step depending on the intended mode behavior for the filter. The main characteristic of the new design technique is that the filter minimum mechanical gap can always be made much larger than in the classical solution (E‐plane corrugated or waffle‐iron filters) for the same frequency specifications. To validate the control of the higher‐order mode suppression that this method permits, three different filters are designed and compared. Moreover, a prototype has been fabricated and its S‐parameters measured to prove the feasibility of the proposed filters for a tailored frequency response. Finally, its high‐power handling capability has been estimated. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2967–2974, 2014

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