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A compact octagonal fractal UWB MIMO antenna with WLAN band‐rejection
Author(s) -
Tripathi Shrivishal,
Mohan Akhilesh,
Yadav Sandeep
Publication year - 2015
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.29220
Subject(s) - mimo , monopole antenna , fractal antenna , ground plane , fractal , omnidirectional antenna , miniaturization , physics , electronic engineering , radiation pattern , geometry , antenna (radio) , acoustics , topology (electrical circuits) , engineering , electrical engineering , coaxial antenna , mathematics , mathematical analysis , beamforming
ABSTRACT In this article, a compact octagonal‐shaped fractal ultrawideband (UWB) multiple‐input‐multiple‐output (MIMO) antenna is presented and its characteristics are investigated. The application of Koch fractal geometry at the edges of octagonal monopole provides desired miniaturization and wideband phenomena due to its self‐similar and space filling properties. The two octagonal fractal antennas are placed orthogonal to each other and used to construct UWB MIMO antenna. An L‐shaped stub is used in the ground plane of the geometry to provide an improvement in the isolation. The band rejection in wireless local area network band is achieved by etching a C‐shaped slot from the monopole of the individual antenna. The compact dimension 40 × 25 mm 2 of the antenna exhibits nearly omnidirectional radiation pattern, a low envelope correlation coefficient (<0.01), with good S‐parameters over the entire UWB frequency range. The measured results show good agreement with the simulated one. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1919–1925, 2015