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A Compact Hepta-Band Loop-Inverted F Reconfigurable Antenna for Mobile Phone

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5 Author(s)
Yue Li ; Dept. of Electron. Eng., Tsinghua Univ., Beijing, China ; Zhijun Zhang ; Jianfeng Zheng ; Zhenghe Feng
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A folded loop-inverted F reconfigurable antenna for mobile phone applications is designed and the obtained results are discussed in this communication. It is shown that loop antenna mode and an inverted F antenna (IFA) mode are controlled by only one p-i-n diodes with simple bias circuit. The impedance can be matched by adopting a matching bridge for both the loop and IFA modes. In a compact volume of 60 × 5 × 5 mm3, the proposed antenna operates in hepta-band, including GSM850, GSM900, GPS, DCS, PCS, UMTS and WLAN, with the return loss lower than 6 dB. A prototype of the proposed antenna is fabricated, measured, and obtained results including return loss, efficiency and gain, are presented.

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Antennas and Propagation, IEEE Transactions on  (Volume:60 ,  Issue: 1 )