MIMO Antenna Design for Wireless Communication Devices

• Main Authors: Kuan-Hsun LaiKuan-Hsun LaiKuan - Hsun Lai, 賴冠勳
• Other Authors: Wen - Shan Chen
• Format: Others
• Language: zh-TW
• Published: 104
• Online Access: http://ndltd.ncl.edu.tw/handle/phe5st

碩士 === 南臺科技大學 === 電子工程系 === 103 === Two MIMO antennas design applied on wireless communication device are presented in the thesis. One is dongle MIMO antenna, the other is mobile MIMO antenna The first USB dongle MIMO antenna is designed for LTE 700 band. The overall dimension of it is 70 x 30 x 1.6 mm3 including an antenna portion 30 x 30 x 1.6 mm3 and system ground portion 45 x 30 x 1.6 mm3. Firstly, the antenna is composed of two identical monopole antennas which located on top of FR4 substrate. Secondly, after drilling and adding copper, the two antennas will connect two strips at the back. The two strips then resonant two modes, Mode 1 (0.7 GHz) and Mode 2 (0.774 GHz) respectively. Regarding the Isolation Mechanism of the MIMO antennas, it will extend from the system ground and placed between the two monopole antennas. The Isolation Mechanism not only improves the impendence matching of the Mode 1, making both of the Molds cover required LTE 700 band, but also makes the Isolation degree above 12 dB. The second one, mobile MIMO antenna, is apply for 4G band. The overall dimension of it is 110 x 75 x 0.8 mm3 including system ground portion 13 x 75 x 0.8 mm3. First of all, this antenna is designed as a dual fed symmetric structure, using the couple fed structure generating the mode at low band. Second, other strips and 3D structure are added to resonance mode and help impedance matching. Finally, the neutralization structure is applied for the Isolation Mechanism of this antenna. The Isolation Mechanism not only improve the matching of the Mold 2 low band but also meet our demand of low band. Moreover, it lower the Isolation degree to above 9dB.