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Compact bandstop filter using coupled-line section

Compact bandstop filter using coupled-line section

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  • Author(s): K.W. Qian 1  and  X.H. Tang 1
    • View affiliations
    • Affiliations: 1: EHF Key Laboratory of Fundamental Science, School of Electronic Engineering, University of Electronic Science and Technology of China, Sichuan, People's Republic of China
  • Source: Volume 47, Issue 8, 14 April 2011, p. 505 – 506
    DOI:  10.1049/el.2011.0107 , Print ISSN 0013-5194, Online ISSN 1350-911X
© The Institution of Engineering and Technology
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A new compact bandstop filter with a coupled-line structure is proposed. Stopband rejection depth and bandwidth can be controlled by the configuration of the coupling section, and good return loss is realised by properly adjusting the impedances of two open-circuited stubs. Design equations are obtained using a lossless transmission line model. To validate the analysis, a bandstop filter with about 72% fractional bandwidth at 5 GHz has been fabricated. The implementation area is 0.32λg×0.18λg.

Inspec keywords: microwave filters; band-stop filters

Other keywords: design equation; coupled-line section structure; open-circuited stubs; compact bandstop filter; return loss; frequency 5 GHz; lossless transmission line model

Subjects: Filters and other networks; Waveguide and microwave transmission line components

References

    1. 1)
      • Ceyhun, K., Adnan, G., Elif, G.: `Asymmetric response dual-mode dual-band bandstop filters having simple and understandable topology', Asia–Pacific Microwave Conf., Singapore, 2009, p. 925–928.
    2. 2)
    3. 3)
    4. 4)
    5. 5)
      • Eryilmaz, G.M.A., Elif, G.B., Adnan, G.C., Ceyhun, K.D.: `Dual-mode microstrip bandstop filters', Asia–Pacific Microwave Conf., Singapore, 2009, p. 1–4.
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