Flexible Monopole Antenna for IoT Applications: A Survey

With the development of mobile communication technology, the emergence of various intelligent terminal devices, and IoT applications’ demand for short-distance high-speed data transmission, the demand for flexible, portable, and reliable antennas is expected to increase exponentially. Flexible antennas have been widely used in various application fields, such as vehicle communication, navigation, healthcare, gyromagnetic devices, and integration with satellite solar cells. A coplanar waveguide (CPW) based inverted trapezoidal flexible antenna for fifth-generation (5G) millimeter-wave (MMW) communication is reviewed. In this article, a flexible monopole antenna based on a coplanar waveguide is discussed to provide a wide range of application prospects for the development of mobile communication technology and flexible smart terminals. This article first describes the research background and development trends of flexible antennas, basic electrical parameters, impedance matching theory, and ultra-wideband trap technology of coplanar waveguide antennas.