volume | PIER Journals

The Internet of Things (IoT) has become a vital part of life, with an increasing number of connected devices; its small size, and high rate of data transmission have attracted the attention of many researchers. Antenna plays a major role in providing wireless signal connectivity. With the intention to provide wider bandwidth to improve the rate of data transmission with the smaller size of the antenna, in this work, a third-level iterated diagonally symmetric fractal antenna has been proposed. A partial ground plane with a notch has been experimented to adjust the antenna impedance over a wider bandwidth parametrically. The antenna has been optimized to eliminate the stopband based on surface current distribution. Following optimization, a modal shift separated two overlapping modes and produced a new resonance close to the stopband. The proposed antenna covers all IoT applications between 2 GHz and 7 GHz. The design has been simulated in mentor graphics and CST studio, and it is verified on a vector network analyser and in an anechoic chamber. The measured S₁₁ and gain are in good agreement with the simulated results. The overall antenna size is 40 mm in length, 40 mm in width, and 1.6 mm in height, and it is fabricated on an FR-4 substrate with a dielectric constant of 4.4.

Mrs. Geeta B. Kalkhambkar

Dr. Rajashri Khanai

Dr. Pradeep Chindhi