A Compact Sub-1 GHz IoT Antenna Design with Wide Tuning Capabilities

In this work, an Internet of Things (IoT) antenna design is presented for low power and long-range communications within 5G sub-1 GHz applications. The antenna design is optimized to operate in sub-1 GHz bands using a simple meandered loop slot-line structure reactively loaded with a varactor diode. The varactor diode helps in achieving frequency reconfigurability (FR) over a wide-band in sub-1 GHz range. The proposed antenna covers frequency bands from 758 to 1034 MHz. The antenna is realized on RO-4350 board with dimensions 60×27 mm
²
. The distinguishing features of the proposed antenna design are simple biasing circuitry, compact low profile antenna design with wide tuning capabilities