A Compact Antenna for LTE/WWAN Applications

• Main Authors: Hsu-yang Cheng, 程旭煬
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/70049027884967544736

碩士 === 國立臺南大學 === 電機工程學系碩士班 === 100 === In this thesis, an internal mobile antenna operating in LTE700/LTE2300/LTE2500 and WWAN (GSM850/ GSM900/ GSM1800/ GSM1900/ UMTS) is presented. The proposed monopole antenna ground portion is to be grounded to the system ground plane of the device for practical applications. For the requirement of multi-band, it adds parasitic folded branches to increase resonating current paths. The size of the proposed PIFA and the ground plane are 38 mm × 22 mm × 5.8mm and 43 mm × 22 mm. Moreover, the antenna has a nearly omni-directional radiation pattern and a reasonable peak gain of 1.7dBi to 4.2dBi by the simulation results. To attain the wide bandwidth of low frequency from 830 MHz frequency band can be effectively integrated in PIFA antenna. By embedding a chip inductor into the PIFA antenna, whose resonant mode is generated between the circuit and the monopole circuit. By using the reactance feed, the monopole antenna can be well incorporated into the antenna structure. The proposed antenna was fabricated on a FR4 substrate, the overall size of the antenna is 75 × 22 × 5.8 mm3. The measured results of return loss and the radiation patterns of each frequency bands were presented and appeared to have good agreement with the simulation results.