COMBINED-TYPE DUAL-WIDEBAND ANTENNA FOR 2G/3G/4G TABLET DEVICE

A combined-type dual-wideband antenna with its lower wideband and higher widebands, respectively, contributed by two separate radiating portions thereof is presented. The two separate radiating portions (one low-band antenna and one high-band antenna) are easily combined into a compact structure for the 2G/3G/4G operation in the 698-960 and 1710-2690 MHz bands. In addition, for applications in the typical tablet device such as a tablet computer, the proposed antenna requires a very small ground clearance of 10 x 30 mm(2) for the 2G/3G/4G operation. The low-band antenna for the 698-960 MHz band is an inverted-F antenna, with its radiating arm coupled to the antenna's feeding strip through a first chip inductor and its shorting strip embedded with a second chip inductor. The high-band antenna for the 1710-2690 MHz band is a monopole antenna formed by connecting a simple strip to the feeding strip and enclosed by the low-band antenna so as to achieve a compact antenna structure. A simple matching circuit disposed on the device ground plane can, respectively, widen the bandwidth of the antenna's lower and higher bands. The proposed combined-type antenna can easily achieve dual-wideband operation with a small antenna volume, and a promising antenna design for the 2G/3G/4G tablet device is presented. (C) 2014 Wiley Periodicals, Inc.