Dual-band rectangular dielectric resonator antenna for ISM and 4 GHz bands applications

In this paper, we propose a dual-band rectangular DRA using the strip-fed method for 2.4 GHz ISM and 4 GHz bands applications. The proposed antenna is composed of small ceramic dielectric (21.65 mm × 15 mm × 26.1 mm, alumina). In order to achieve our goals, we made a cylindrical perforation through the DRA. The measured bandwidth and maximum radiation gain are 2.35 - 2.48 GHz (VSWR < 1.05, 8.54 dBi at 2.4 GHz) and 3.5- 4.52 GHz (VSWR < 1.02, 8.29 dBi at 4.25 GHz), respectively. From these results, it is demonstrated that our proposed antenna can be applicable to the ISM and 4 GHz bands applications.