Planar Inverted-L Antenna for Octa-Band Operations of Smart Handsets

Abstract

This paper applies inverted-L antenna (ILA) to design a smart handset antenna in accordance with octa-band operations, as GSM 850 (824–894 MHz), GSM 900 (880–960 MHz), GSM 1800/1900, DCS 1800 (1710–1880 MHz), PCS 1900 (1850–1990 MHz), UMTS (1920–2170 MHz), IEEE 802.11b WLAN (2400–2484 MHz) and LTE (1700 MHz/2300 MHz/2600 MHz) band operations for S ₁₁ ≦ −10 dB. The entire antenna is 70 mm × 24 mm with one-quarter wavelength design of hub. With the inter-coupling between dual branch circuit radiation and multiple branch circuit radiation, the wideband for GSM 1800/1900, DCS, PCS, UMTS, IEEE 802.11b WLAN and LTE 1700/2300/2600 is generated. When integrating with mobiles, the designed ground plane area is also taken into consideration. In this case, the ground plane area can be increased in accordance to the system motherboard. The enlarged antenna size therefore becomes 9 mm × 42 mm that the ground plane area does not affect the bandwidth and can enhance the impedance matching. Consequently, the mobile antenna can not only reduce or increase the size to match up the products, but also be designed for tablet computers because it covers octa-band operations of smart handsets.