Abstract
With the rapid growth of high speed wireless communication, there is a need for a single antenna operating at different frequencies. Multiband antenna has provided the much needed solution for single antenna with wide bandwidth that will support multiple standards at the same time. Here, we have proposed a compact annular ring-shaped monopole antenna. The antenna has an L-shaped slot etched along with an additional slot near the feed point. The additional slot contributes in minimizing the return loss S11. Further for bandwidth enhancement to cover the wide range upper bevel cut with defected ground plane is proposed, two C-shaped slots are etched in the ground plane were made for obtaining new band at 7.5 GHz. The stepwise design procedure is thoroughly discussed along with parametric analysis and can be independently controlled for most applications. The proposed monopole antenna has dimensions of 50.9 × 33 × 0.8 mm3 with FR4 as its substrate. The FR4 substrate has a dielectric constant value \({\epsilon}_{r}\) = 4.4. This paper analyses the impedance bandwidth, return loss along with radiation plots. We have also verified the housing effect by placing the antenna in the vicinity of copper plate. Efficiency is improved up to 90 % with better return loss of −40 db is obtained.
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