Design of a miniaturized UHF-band Zigbee antenna applicable to the M2M/IoT communication

In this paper, a miniature UHF-band Zigbee antenna is proposed. Considering a lighter weight and smaller footprint of the Zigbee platform attached to a walking person, the antenna is meandered on the top and partially short circuited on the bottom, and optimized with non-uniform widths and lengths of the radiating element, and capillary paths. Due to these contributing factors, the physical area is reduced by roughly 50% from the simple monopole antenna. Besides, the bandwidth of 20 MHz is obtained for the resonance frequency of 915 MHz, working appropriately for the UHF-band Zigbee application such as M2M and IoT. The full-wave simulation with the measurement verifies the proposed design.