A Compact Dual-Band Printed Antenna Design for LTE Operation in Handheld Device Applications

A novel internal printed antenna suitable for triple long-term evolution (LTE) bands for handheld devices is presented. The operating bandwidths of the design are LTE700 (698 similar to 800 MHz), LTE2300 (2300 similar to 2400 MHz), and LTE2500 (2500 similar to 2690 MHz). Through the use of a C-shape broadside coupled feed structure, full operation in the lower band is achieved. The antenna itself uses two unequal path lengths to produce a low frequency band with two resonant modes. The required bandwidth is then adjusted using a couple feed, and finally placed over a ground plane via another C-type coupling element in order to enhance the two low-frequency matches. In the definition of the -6 dB reflection coefficient, the bandwidth of two basic modes in the low frequency band is 0.689 similar to 0.8 GHz. We adopt the definition of the -10 dB reflection coefficient for the high frequency mode, and its working frequency bands are shown to be 2.3 similar to 2.72 GHz. The antenna size is only 40 x 12 x 0.8 mm(3) with a ground plane of 98 x 40 mm(2)