A digitally tuned reconfigurable patch antenna for IoT devices

In this paper, a reconfigurable patch antenna design operating at 868MHz for Low Power Wide Area Network (LoRa), 1.58 GHz for Global Positioning System (GPS) and 2.4 GHz for Bluetooth is presented. The design is reconfigurable thanks to the integration of a digitally tunable capacitor (DTC). The DTC capacitance changes according to a 5 bits' sequence command. A microcontroller is used to assign the required sequence, and thus leading to frequency reconfiguration. The antenna is a circular patch with a gain that varies from 0.2 dB to 6 dB based on the desired frequency of operation and the reconfiguration state. The antenna is designed for internet of things (IoT) applications.

[1]  Roberto Gaddi,et al.  Radiated efficiency of aperture tuned antennas: Comparison of MEMS Digital Variable Capacitor and fixed ceramic capacitors , 2014, 2014 IEEE MTT-S International Microwave Symposium (IMS2014).

[2]  Youssef Tawk,et al.  Reconfigurable Antennas: Design and Applications , 2015, Proceedings of the IEEE.

[3]  F. Ferrero,et al.  Feasability of an Ultra narrow band antenna for the internet of things , 2015, 2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting.

[4]  Fabien Ferrero,et al.  Reconfigurable Antenna for Future Spectrum Reallocations in 5G Communications , 2016, IEEE Antennas and Wireless Propagation Letters.

[5]  Leonardo Lizzi,et al.  Design of antennas enabling miniature and energy efficient wireless IoT devices for smart cities , 2016, 2016 IEEE International Smart Cities Conference (ISC2).

[6]  Chih-Kai Chang,et al.  Diversity antenna design for compact devices of IoT uses , 2016, 2016 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM).