Planar Internal LTE/WWAN Monopole Antenna for Tablet Computer Application

Planar compact tablet computer monopole antenna for 4G mobile communication system

“…At higher frequencies (1795 MHz) in the antenna's upper band, more dips and variations are seen in the radiation patterns than those at lower band. This behavior closely resembles the observations for the internal WWAN/LTE handset antennas [3][4][5]. This similarity is largely owing to that more surface current nulls are excited in the display ground at higher frequencies than at lower ones.…”

“…Several planar monopole antennas (MAs) developed for 4G system in tablet computers [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] are presented, however, limited with a bulky dimension. To overcome this limitation, a multi-branch shorted strip is first introduced to generate triple quarterwavelength resonant modes at approximately 750/920/1780 MHz bands in order to comply with the operating bandwidths of 4G mobile system.…”

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

“…With comparison to the dimension of the system ground plane of the mobile handset, [36] the display ground of the tablet computer is large to make the radiation patterns significantly different from the dipole-like patterns at 750 and 925 MHz bands. Meanwhile, similar to the far-field performances for the internal WWAN/LTE handset antennas, [3][4][5][6] more dips and variations are observed in the radiation patterns at higher frequencies (1795, 2045, and 2350 MHz) in the antenna's upper band. This similarity is largely owing to that more Figure 10.…”

“…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...…”