Metamaterial-Inspired Broadband Circularly Polarized SIW Antenna for WLAN/WBAN/ISM Applications

• Published in: Wireless personal communications 2024-02, Vol.134 (3), p.1697-1711
• Main Authors: Selva Nidhyananthan, S., Prashalee, P., Anand, S.
• Format: Article
• Language: English
• Subjects: Antenna design; Antennas; Bandwidths; Broadband; Circular polarization; Communications Engineering; Computer Communication Networks; Coplanar waveguides; Directivity; Engineering; Local area networks; Metamaterials; Networks; Signal,Image and Speech Processing; Substrate integrated waveguides
• ISSN: 0929-6212; 1572-834X
• DOI: 10.1007/s11277-024-10995-7

An antenna design with a coplanar waveguide (CPW) fed wide band circular polarization (CP), inspired by compact metamaterials, is presented in this paper. Substrate Integrated waveguide (SIW), metamaterial with CPW feed, and monopole patch make up its construction. A three-GHz axial ratio bandwidth (ARBW) is obtained by adding a rectangular slot at the monopole stub to produce CP. Incorporating SIW and metamaterial into the antenna design improves gain, directivity, bandwidth, and efficiency. Metamaterial and SIW utilized in the design comprising monopole patch with a stub, slots at the edges and the stub improve the antenna properties efficiently. ISM band, WLAN, and WBAN applications are appropriate for the suggested antenna. The antenna has a 3.6 dBi gain and measures 20 × 20 × 0.8 mm 3 . A radiation efficiency of 98% and a fractional bandwidth of 63.9% are obtained by incorporating the advantages of CP in a broadband SIW antenna inspired by metamaterials (3.99–7.62 GHz).