Scalable 2.45 GHz electrically small antenna design for metaresonator array

Yee Loon Sum; Vanessa Rheinheimer; Boon-Hee Soong; Paulo J.M. Monteiro

Scalable 2.45 GHz electrically small antenna design for metaresonator array

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Author(s): Yee Loon Sum¹ ; Vanessa Rheinheimer² ; Boon-Hee Soong¹ ; Paulo J.M. Monteiro^{3, 4}
- Affiliations: 1: School of Electrical and Electronic Engineering , Nanyang Technological University , 50 Nanyang Avenue Singapore 639798 , Singapore ;
  2: Berkeley Education Alliance for Research in Singapore , CREATE Tower, 1 Create Way, Singapore 138602 , Singapore ;
  3: Department of Civil Engineering , University of California at Berkeley , USA ;
  4: Faculty Scientist, Department of Materials , Lawrence Berkeley Laboratory , 725 Davis Hall, Berkeley, CA 94720 , USA
Source: Volume 2017, Issue 5, May 2017, p. 170 – 174
DOI: 10.1049/joe.2017.0015 , Online ISSN 2051-3305

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)

Received 14/01/2017, Accepted 19/04/2017, Revised 27/03/2017, Published 17/05/2017

In many planar antenna array designs, impedance transformers are required to interconnect the elements to ensure that their impedances are matched. However, impedance transformers take up space and reduce area utilisation. If each element is electrically small and able to function individually as an electrically small antenna (ESA), they can be combined into an array without using impedance transformers. In this study, a stubbed hexagonal shaped folded dipole ESA of one tenth of the wavelength is proposed and developed. This metamaterial inspired design of loading the folded dipole with split ring resonator overcomes the problem of fabricating ESA of one tenth of the wavelength using typical printed circuit board fabrication technologies for the 2.45 GHz band. To show the potential of using this ESA as a unit element for antenna array without using impedance transformers, a seven-element array is designed and fabricated. By optimising the element separation distance, and stub lengths, the ESA array shows good S ₁₁ of less than −25 dB, and gain improvement of up to 12 dB compared with a single unit ESA.

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Scalable 2.45 GHz electrically small antenna design for metaresonator array

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