A simple two-strip antenna formed by a driven strip and a shorted parasitic strip to provide two wide bands with a very low profile of 8 mm for the LTE/WWAN operation (698-960/1710(698-960/ -2690 in the tablet devices such as a tablet computer is presented. In addition to the very low profile, the antenna occupies a small clearance region of 8 3 50 mm 2 above the top edge of the device ground plane, and the thickness of the antenna is 3.8 mm only, which is promising for modern tablet device applications. The dual-wideband operation of the antenna is obtained by configuring the driven strip into a step shape, while the shorted parasitic strip includes a main segment and a double-stepshaped shorting segment. The proposed antenna configuration can lead to proper coupling between the driven strip and the parasitic strip, so that wideband resonant modes thereof can be generated, making the antenna's wide higher band cover the desired 1710-2690-MHz band. For the desired lower band of 698-960 MHz, it is achieved by integrating the driven strip with a high-pass matching circuit of a series chip capacitor of 1.8 pF and a parallel chip inductor of 13 nH, which does not increase the antenna's occupied volume and requires no realty space on the device ground plane. The integrated high-pass matching circuit greatly widens the antenna's lower band. Details of the proposed antenna are presented and discussed.
A low-profile, small-size (10 3 40 mm 2 on a thin dielectric substrate) planar LTE/WWAN antenna suitable for slim tablet computer application is presented. The antenna is formed by a coupled-fed shorted strip antenna and an inductively coupled branch strip, with a chip inductor of 22 nH connected therebetween. At higher frequencies, owing to the high inductive reactance provided by the chip inductor, the branch strip will have very small effects on the antenna performances, and the coupled-fed shorted strip antenna alone can provide a highband operation of 1710-2690 MHz. At lower frequencies, the embedded chip inductor can decrease the antenna's required resonant length, and the coupling feed can greatly widen the bandwidth of the excited resonant mode such that the antenna can cover a low-band operation of 704-960 MHz. Good radiation characteristics of the antenna in the lowband and high-band operations are also obtained. Details of the proposed antenna and its experimental and simulated results are presented.
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