Smartphone antenna design is reasonably complicated because of different communication standards and regulatory requirements. In addition, there are multiple antennas on a smartphone as shown below in the figure.
2G/3G Mobile Antenna
4G Mobile Antenna
GPS Antenna (1.575 GHz)
WiFi Antenna (2.6 GHz & 5.2 GHz)
5G Communication Antenna
Most of these antennas are PIFAs. There is a single large ground plane that supports the circuit board and touch screen, and this is the ground plane for all the antennas. Bandwidth depends very much on the size of the ground plane. So, for better performance, the whole available size of the chassis should be used as a ground plane. Reducing the ground plane can effectively limit the bandwidth of the PIFA antenna.
A smartphone built on a mobile operating system, with more advanced computing capability connectivity than a feature phone. The smartphones combined the functions of a mobile phone, media players, low-end compact digital cameras, pocket video cameras, and GPS navigation, high-resolution touchscreens, and web browsers. With more operators announcing their LTE network coverage and plans, many smartphone manufacturers are switching to LTE based phones. Long Term Evolution (LTE) is a radio platform technology that will allow operators to achieve even higher peak throughputs than HSPA+ in higher spectrum bandwidth. The prime objective of LTE is to provide high data speed. A typical smartphone along with important electronics component is represented in Figure.