Printed Antenna for Penta-Band Wwan Tablet Computer Application Using Embedded Parallel Resonant Structure

Abstract

Abstract-A compact printed antenna for WWAN tablet computer application is proposed in this article. The designed antenna occupies a small area of 35 × 12 mm 2 , which is small enough to be incorporated in a tablet computer, and is placed close to the edge of the shielding wall with a distance of 10 mm. The antenna has a simple structure of comprising a long coupling strip and a feeding strip to capacitively excite the long coupling strip. In this scheme, a chip inductor is loaded on one branch of the feeding strip, which can form a parallel resonant structure to enhance the bandwidth of the lower band. As a result, two wide operating bands to cover GSM850/900 and GSM1800/1900/UMTS2100 operation are obtained with desired 3 : 1 VSWR. The proposed antenna is an all-printing structure with low production cost, which is especially suited for the thin-profile tablet computers.

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.…”

“…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.…”

“…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...…”

Multiband Handset Antenna Analysis Including Lte Band Mimo Service

“…Therefore, the MIMO antenna, where antenna elements are separated on the top and bottom portions of a mobile handset, might be an alternative configuration to use the space for the antenna more effectively. In addition to the coverage of frequency bands such as GSM850/GSM900/DCS/PCS/UMTS, operation at the new frequency band (LTE 13 band, 746 ∼ 787 MHz) requires a significantly wide impedance bandwidth at a lower frequency band [16][17][18][19][20][21][22]. In general, to widen the impedance bandwidth, an additional antenna volume is also needed [23,24].…”