Abstract
In this article, a low-profile, compact, quad-port super-wideband (SWB) multiple-input–multiple-output (MIMO) antenna is presented for the internet of things (IoT) applications. The proposed antenna comprises four identical sickle-shaped resonating elements, which are excited by tapered coplanar waveguide (CPW) feed lines. The antenna elements are arranged in rotational symmetry (mutually orthogonal to each other) to achieve high port isolation. A complementary slot, which matches the sickle-shaped radiator, is etched from the ground of the proposed monopole antenna element to achieve massive bandwidth. The MIMO antenna possesses a resonating bandwidth ( $\vert S_{11}\vert \le -10$ dB) of 1.3–40 GHz and a bandwidth ratio of 31:1. In addition, an L-shaped slit and a complementary split-ring resonator (CSRR) are introduced in the sickle-shaped radiator to reject Bluetooth (2.4 GHz), WLAN (5.5 GHz), and downlink of X-band satellite communication (7.5 GHz) signals from the SWB. The proposed MIMO antenna is fabricated and experimental results are found in agreement with the simulated results.
Highlights
The internet of things (IoT) is a widely used term across the globe
The three notches can be varied by altering the dimensions of the complementary split-ring resonator (CSRR) and L-shaped slit
The inter-element isolation achieved is larger than 22 dB, and it increases toward higher frequency range
Summary
The internet of things (IoT) is a widely used term across the globe. Billions of mobile devices and base station terminals will be connected through the internet to provide multiple IoT-based services. It is expected that by the end of the year 2020 more than 10 billion devices will be linked through IoT, while this number increases to 40 billion shortly. The selection of the antenna system being used in the IoT connected enddevices plays an important role in their functioning. Numerous factors, such as less design cost, low power consumption, simple hardware configuration, omnidirectional radiation patterns, need to be considered for designing an efficient antenna for IoT devices
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