A Miniaturized Reconfigurable Uhf Antenna

This paper presents a novel planar reconfigurable meandered loop antenna that is suitable for Internet of Things (IoT) applications. This antenna reconfigures its frequency of operation between two ISM bands, 760 MHz and 575 MHz. The antenna structure also has three folded edges, six layers and with total dimensions of 40x40mm(2). The top layer (layer 1) is a meandered loop patch placed on top of a dielectric substrate and an air gap. The patch is fed through a shorting sheet from the feeding network. The feeding network constitutes the fourth layer of the antenna structure, which is placed on top of a dielectric layer and a full ground plane. The antenna has a compact size with miniaturization percentage of 70% at 760 MHz and 80% at 575 MHz.