Abstract
A decoupled octaband WWAN/LTE dual-antenna system occupying a size of 80 mm × 15 mm × 6.8 mm for smart phones is proposed. The proposed antenna system consists of two antenna elements with symmetrical geometry, two neutralization lines (NLs) with embedded inductor, and an inverted-T branch. The two NLs mainly reduce the mutual coupling at the desired lower (704–960 MHz) frequency band, while the inverted-T branch mainly reduces the mutual coupling at the desired higher (1710–2690 MHz) frequency band. The fabricated prototype has a −6 dB impedance bandwidth of 0.3 GHz (0.69–0.99 GHz) and 1.2 GHz (1.66–2.86 GHz) which cover the LTE700, GSM850, GSM900, DCS, PCS, UMTS, LTE2300, and LTE2500 bands. Within these bands, the measured mutual couplings are lower than −10 dB. The measured antenna efficiencies are about 42.6%–60% and 58.3%–78.7% at the desired lower and higher frequency bands, respectively. The diversity performance and the SAR performance are also evaluated.
Highlights
Multi-input and multi-output (MIMO) is one of the critical techniques for the fifth-generation (5G) mobile communication [1]
Because most of the spaces in smart phones are reserved for the display, cameras, battery, and printed circuit board (PCB), only small spaces are left to design antenna [3]. us, designing multiple antennas with low mutual coupling in the limited space of smart phones is very challenging
The diversity performance of the proposed dual-antenna system satisfies the criterions of low correlation and comparable average received power (|MEG1-MEG2| is lower than 3 dB) [27]
Summary
Multi-input and multi-output (MIMO) is one of the critical techniques for the fifth-generation (5G) mobile communication [1]. We propose another octaband dual-antenna system covering the LTE700, GSM850, GSM900, DCS, PCS, UMTS, LTE2300, and LTE2500 bands with the antenna efficiency of higher than 42%. To study the proposed antenna, the decoupling method of the two neutralizations (NL) with the embedded inductor and the inverted-T branch is analyzed.
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