Development of Decoupling Techniques for Compactly Deployed Antennas

• Main Authors: ZOU MIN, 鄒敏
• Other Authors: Wen-Jiao Liao
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/nvh9p2

碩士 === 國立臺灣科技大學 === 電機工程系 === 107 === Due to the increased requirements of wireless transmission rate, multiple antennas on mobile devices must be placed in a limited space to support advance wireless communication technologies. Therefore, the coupling issue between antennas must be resolved. This paper proposes a compact dual-antenna decoupling architecture that can work at a slot environment set up at the notebook’s side. In order to increase the isolation of two compactly displaced antennas, pattern diversity is first used to reduce radiation coupling. Then, to reduce conduction emission coupling, conduction currents are canceled by extending their paths in the loop environment. Measured S-parameter and radiation efficiency spectra verify that the decoupling architecture can effectively improve the isolation. Based on the propose decoupling technique, a dual-band WLAN IFA antenna is designed, which is suitable for decoupling uses in slot environment. Furthermore, by adding geometric discontinuities for the high-frequency conduction current path in the slot, the currents can achieve a mutual canceling effect. Therefore, decoupling nulls can be observed in both WLAN bands. Through implementation, the performance of the compact antenna built in the decoupling slot is verified. The reflection coefficient, isolation and radiation efficiency performances can satisfy the application specifications of notebook products.