The field of flexible antennas is witnessing an exponential growth due to the demand for wearable devices, Internet of Things (IoT) framework, point of care devices, personalized medicine platform, 5G technology, wireless sensor networks, and communication devices with a smaller form factor to name a few. The choice of non-rigid antennas is application specific and depends on the type of substrate, materials used, processing techniques, antenna performance, and the surrounding environment. There are numerous design innovations, new materials and material properties, intriguing fabrication methods, and niche applications. This review article focuses on the need for flexible antennas, materials, and processes used for fabricating the antennas, various material properties influencing antenna performance, and specific biomedical applications accompanied by the design considerations. After a comprehensive treatment of the above-mentioned topics, the article will focus on inherent challenges and future prospects of flexible antennas. Finally, an insight into the application of flexible antenna on future wireless solutions is discussed.

This study proposes a coplanar waveguide‐fed circular monopole antenna that is designed by ink‐jetting conductive silver particle ink on photo paper. The antenna comprises a slotted circular patch and a reduced symmetrically slotted ground plane that is etched rectangularly. The slotted circular patch and ground plane provide the design flexibility with a broad bandwidth, substantial gain over 1.66–56.1 GHz frequency band, and relatively consistent radiation pattern. The fractional bandwidth (%BW) of this antenna is 188.5% that is covering industrial, scientific, and medical (ISM) bands, ultra‐wideband, wireless local area network (WLAN) band, worldwide interoperability for microwave access (WiMAX) band, and various frequencies of upcoming fifth‐generation technology. The total size of the antenna is only 34 × 25 mm2, with an electrical dimension of 0.18 λ × 0.13 λ at 1.66 GHz. The bandwidth ratio (BR) is 33.81:1, and the bandwidth dimension ratio (BDR) is 7462, which is the highest among the flexible super‐wideband antennas reported so far. It is a low profile, lightweight, and low‐cost antenna that is accommodating a broad frequency spectrum for extended wideband communication. The measured results show good agreement with the simulations.