Frequency tunable antenna for LTE (4G) handsets operating in the 2.3–2.7GHz global roaming band

A frequency tunable antenna for 4G global roaming devices operating in the 2.3-2.7GHz band is presented. Both the design and manufacturing methods are described and measured data are provided. Antenna is a half-patch with a reconfigurable aperture realized by a collection of shorting pins that are controlled by DC signals. The design follows the teachings of the patented self-structuring antenna technology and can be operated either in open or closed loop fashion. The frequency tunable feature of the antenna also makes it immune to detuning when used in a closed loop control system. Though the design is compatible with a multitude of manufacturing and embedding methods, the particular prototype was built by wire-bonding bare-die SPST switches onto the antenna board.