A Planar WWAN/LTE Antenna for Portable Devices

Planar small-size LTE/WWAN tablet computer antenna with eight-band operation

“…Additionally, as for the overall antenna volume of only 35 × 10 × 0.8 mm 3 (280 mm 3 ), the proposed antenna has the merit of an antenna size at least 22% less than the smallest dimension of 45 × 10 × 0.8 mm 3 for the LTE/WWAN internal antenna in a tablet computer. [6] Finally, the proposed monopole strip antenna design is more feasible than those above-mentioned ones [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] for embedding into the tablet computers. Moreover, the internal antennas and the user body is less than 20 cm apart in distance during device use.…”

“…Therefore, to fulfill the 698-960/1710-2690 MHz bands and suitably embed it into a limited space, a small-size multiband antenna is the most optimal candidate of providing commercial broadband coverage in the bandwidth specifications of the 4G (LTE/ WWAN) system. The various applications of several planar monopole antennas (MAs) developed for LTE/WWAN operations include tablet computers, [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] laptop computers [18][19][20], and mobile phones. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] However, those presented antenna designs have the drawbacks in the larger antenna size [3][4][5][6][7][8][9][10] or insufficient operating bandwidth [11][12][1...…”

“…ground plane) resonant mode generally not be excited to obtain wider antenna's bandwidth, [20,38,39] especially for lower (LTE700/GSM850/ 900 MHz) band. Several designs have been presented using the lumped LC matching circuit [2,13] to enhance the operating bandwidth or adding a chip component [8,10,12] to make the antenna dimensions more compact. However, due to the additional losses probably incurring from the lumped element in the external matching circuit, the radiation efficiency of the presented antennas [2,8,10,12,13] will be subsequently decreased.…”

“…Several designs have been presented using the lumped LC matching circuit [2,13] to enhance the operating bandwidth or adding a chip component [8,10,12] to make the antenna dimensions more compact. However, due to the additional losses probably incurring from the lumped element in the external matching circuit, the radiation efficiency of the presented antennas [2,8,10,12,13] will be subsequently decreased. To overcome this limitation, a multibranch shorted strip is first introduced to excite triple quarter-wavelength resonant modes close to 750/920/1780 MHz bands in order to comply with the LTE700/GSM850/900/1800 operating bandwidths.…”

A multiband antenna design for long term evolution (LTE) application

“…With the aim of providing higher bandwidth this standard aims to supports data rates up to 100 Mbps for high mobility users and 1 Gbps for low mobility users. [3], [5] and monopole antenna [2], [4]. Most of the published works are based on 6dB return loss and covers only a few LTE frequencies [6], [7].…”