| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系 === 107 === This thesis proposes a 4G and a 5G low-profile two-element MIMO antenna system for laptop computer applications. In the 4G MIMO antenna system, the two antenna elements with the same structure and dimensions are symmetrically deployed on the two sides of the clearance area of the hinge. Printed on a 50 × 5 mm2 FR4 substrate, each antenna element consists of a feeding monopole and a short-circuited monopole. The structurally simple planar antenna element is tightened with the ground plane. Such integration can lead to resonant modal current flowing on the ground plane, so that the operating bands can cover the LTE eight bands. In the operating bands, the measured isolation is higher than 20 dB, and the measured realized efficiency is larger than 40%.
In the dual-band 5G MIMO antenna system, the two antenna elements with the same structure and dimensions are three-dimensional, each measuring 29 × 2 × 3 mm3. They are placed on the upper edge of the display ground plane, and are 15 mm away from the left edge of the ground plane. Each antenna element is constructed using a feeding monopole and a short-circuited monopole. Without inserting any isolation element in between, the two antenna elements with the same orientation and with a separation gap of only 4 mm can reach a measured isolation of larger than 11 dB. Within the 5G operating bands of 33003600 and 48005000 MHz, the calculated ECCs from measured radiation patterns are less than 0.05, and the measured realized efficiency is larger than 40%.
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