A Bandwidth Enhancement of The Bowtie Antenna Using Its Taper-Cut Angle Optimization for IoT Applications

Internet of Things (IoT) can be an important key to support massive communication among things. The wideband antenna is a part of the element that can play an important role in IoT. Bowtie antenna can provide a wide fractional bandwidth to be expected to cover the IoT frequency applications. The combination of the taper line and the extra patch is presented in this paper to enhance the bandwidth of this antenna. This paper describes a modified double-sided bowtie antenna design that is suitable for integration in LPWAN nodes. The first design of the bowtie antenna produces a single band frequency response, the second design has a dual-band frequency response, and the third design achieves a wideband frequency response. The third antenna design operates in the frequency range from 0.78 GHz to 3.20 GHz, covering the unlicensed LPWAN standard and cellular-based LPWAN standard. Its dimensions are 120 mm (length) × 60 mm (width) × 0.67 mm (thickness). The design optimization using a tapered line and an extra patch can perform the best return loss since it affects the antenna impedance.