Miniaturized Inverted L-Shaped Slot Antenna Using HMSIW Technology

Abstract

This article presents a compact size Inverted Lshaped antenna for wireless applications like WLAN and commercial WI-FI applications. The proposed design uses Half Mode Substrate Integrated Waveguide (HMSIW) technology to reduce antenna footprint by 50%, achieved by bisecting the fullmode cavity along the magnetic wall. Further, the miniaturization has been achieved by around 25% by introducing an inverted L-shaped slot on the top cladding of the HMSIW cavity. After introducing the slot, the frequency is reduced to 2.45 GHz from 5.3 GHz. Hence, the overall footprint of the antenna has been reduced to 75%. By using the SIW technology, the cavity-backed antenna is realized in a planar form, also it retains the features of the full-mode cavity. The antenna is designed on RT Duroid 5880 with a substrate thickness of 1.575 mm and a dielectric constant of 2.2. The proposed antenna resonates at 2.45 GHz with a fractional bandwidth of 2.6%. The antenna’s directivity is obtained at 4.91 dBi at the operating frequency. The proposed antenna depicts a unidirectional radiation pattern with a front-to-back ratio (FTBR) of 12.75 dBi. The proposed geometry is low-profile, planar, and compact in nature which can be easily integrated into a hand-held device.