Design of Multiband Broadband, and Band Reconfigurable Antennas on Portable Devices

• Main Authors: Yi-An Chen, 陳羿安
• Other Authors: Wen-Jiao Liao
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/08166995800700634635

碩士 === 國立臺灣科技大學 === 電機工程系 === 103 === An operation band reconfigurable antenna scheme is proposed for handheld devices to cover extensive digital TV broadcasting bands, which include both VHF and UHF bands. A matching network bank with RF switches is employed to divide the broad operation band into four narrower sub-bands with improved matching conditions. When a new antenna or a new platform is adopted, lump elements in the matching network bank can be modified to restore desired performances. To demonstrate the feasibility of the proposed reconfigurable antenna scheme, this work is completed with the control firmware implemented on a single-chip digital TV receiver IC. Both RF and system level tests were conducted to validate the enhanced reception performance. A single feed and dual branch CCE antenna is also proposed in this work. It provides a coverage on 690 to 960 MHz and 1710 to 2690 MHz LTE bands for uses on mobile devices of different sizes. The antenna adopts the capacitive coupling element technique to minimize the antenna footprint and reduce its clearance distance to the ground. Since the platform is rather compact, two antennas of dissimilar configurations are employed to reduce coupling. Its superior diversity performance is validated with measured effective diversity gain, which confirms that the proposed design is suitable for LTE MIMO uses.