Compact Antenna for UHF IoT LPWAN Sensor

Abstract

The design of compact UHF antenna is proposed that can be used for an internet of things(IoT) sensor. The intended communication protocols are the ones used in Low Power Wide Area networks (LPWAN) using the 868 Mhz band in Europe. Practical consideration have been given to the design in question by including the electronics and battery in the simulation scenario. A high radiating efficiency is obtained given the the element electrical size of less than lambda/8. The matching bandwidth is close to 2 percent ensuring that the 3 MHz required for LPWAN protocols operating in the ISM band are covered even with manufacturing uncertainties. This is achieved by designing the antenna around the unique specification for this compact sensor which occupies a volume of 45×30×4 cubic mm.