Wideband Planar Four-Element Linear Antenna Array

This letter presents a planar wideband linear antenna array to cover multiple wireless standards. The array consists of four microstripline-fed open-ended quarter-wavelength slot antenna elements. By feeding the antenna properly, a fundamental radiating antenna mode can be excited over a wide freque...

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Bibliographic Details
Published in:IEEE antennas and wireless propagation letters 2014, Vol.13, p.1663-1666
Main Authors: Sonkki, Marko, Pfeil, Douglas, Hovinen, Veikko, Dandekar, Kapil R.
Format: Article
Language:English
Subjects:
Antenna arrays
Antenna measurements
Antenna radiation patterns
Array factor
Arrays
Broadband antennas
cognitive radio
fundamental antenna mode
multiple-input-multiple-output (MIMO) antenna
slot antenna
smart antenna
software defined radio
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Summary:This letter presents a planar wideband linear antenna array to cover multiple wireless standards. The array consists of four microstripline-fed open-ended quarter-wavelength slot antenna elements. By feeding the antenna properly, a fundamental radiating antenna mode can be excited over a wide frequency range. The antenna array is simulated in terms of surface current distributions and S-parameters. Simulated results are compared to the manufactured prototype antenna array. Measured results show the -10-dB impedance bandwidth is from 2.55 to 6.1 GHz, corresponding to 83% relative impedance bandwidth, while mutual coupling is less than -16.6 dB within the aforementioned impedance bandwidth. The simulated -10-dB bandwidth is from 2.0 to 6.0 GHz. Measured radiation patterns are presented at 2.4, 3.5, and 5.2 GHz with 4.6, 7.0, and 7.9 dBi maximum gain in boresight direction, respectively. The measured radiation patterns and grating lobe levels correlate well with the theory and are 10-15 dB below the main lobe depending on the studied frequency.
ISSN:1536-1225
1548-5757
DOI:10.1109/LAWP.2014.2350259