PROJECT TITLE :

Passive Reconfigurable Triple-Wideband Antenna for LTE Tablet Computer

ABSTRACT:

A passive reconfigurable triple-wideband tablet computer antenna for the LTE operation in the low band of $698sim 960~{rm MHz}$, middle band of $1710sim 2690~{rm MHz}$, and high band of $3400sim 3800~{rm MHz}$ is presented. The antenna mainly acts like an inverted-F antenna (IFA) at frequencies in the LTE low and middle bands and like a loop antenna at frequencies in the LTE high band. The reconfigurable IFA/loop antenna is achieved without active switch circuits and occupies a small volume of $10 times 35 times 3~{rm mm}^{3}$. The antenna is obtained by first configuring the radiating arm of an IFA to be folded and coupled to the device ground plane through a distributed capacitor. Then, the IFA's shorting and feeding strips are respectively loaded with an inductor and a capacitor. This leads to good excitation of a resonant mode generated in the LTE low band with the radiating arm length of the IFA only about 0.16 wavelength at 800 MHz. By further aided using a high-pass matching circuit integrated within the antenna, a wide low band is obtained for the antenna. The IFA's first two higher-order modes can also be excited in the middle band. Owing to the distributed capacitor between the IFA's radiating arm and the device ground plane, the two higher-order modes can lead to a wide middle band for the antenna. At frequencies in the LTE high band, the antenna mainly acts like a loop antenna operated at its one-wavelength loop mode, which contributes to a wide high band for the antenna. Triple-wideband operation covering the LTE operation is hence obtained. Details of the proposed antenna are described, and experimental results are presented. Working principle of the antenna acting like an IFA a-
d a loop antenna at different frequencies is discussed.


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