Compact coplanar waveguide power splitter with filtering capability based on slow-wave structures

Paris Vélez, Francisco Aznar-Ballesta, Jan Coromina, Jordi Bonache, Ferran Martín

Research output: Contribution to journalArticleResearch

4 Citations (Scopus)

Abstract

© 2019 Wiley Periodicals, Inc. A compact coplanar waveguide (CPW) power splitter with filtering capability is presented in this paper. The splitter consists of a pair of 70.71 Ω impedance inverters implemented by means of inductively and capacitively loaded slow-wave structures. Such slow-wave structures efficiently shorten the length of the inverters, thereby providing substantial size reduction to the power splitter. The filtering functionality is due to the Bragg effect, related to periodicity. The proposed splitter, designed to be functional at 1 GHz, exhibits good performance at that frequency, with measured return loss of 20.6 dB and insertion loss of 3.15 dB and 3.23 dB at the output ports. Moreover, the suppression level at the first, second and third harmonic frequency is better than 12.4 dB, 34.6 dB and 24.7 dB, respectively. As compared to the length of the ordinary inverters, the length of the constitutive slow-wave impedance is reduced by a factor of two.
Original languageEnglish
Pages (from-to)1143-1148
JournalMicrowave and Optical Technology Letters
Volume61
DOIs
Publication statusPublished - 1 May 2019

Keywords

  • coplanar waveguides
  • power splitter
  • slow-wave structures

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