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http://dx.doi.org/10.5515/KJKIEES.2007.18.12.1337

Inverted π Feeding PIFA for Gain Improvement for the Mobile Phone  

Son, Tae-Ho (Dept. of Infocom Engineering, Soonchunhyang University)
Lee, Jae-Ho (Antenna R&D LAB, Mobile Communication Division, Samsung Electronics Co. LTD)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.18, no.12, 2007 , pp. 1337-1344 More about this Journal
Abstract
It is shown that inverted ${\pi}$ feeder affects the gain improvement for the internal antenna of mobile phone. Generation of current on the inverted ${\pi}$ feeder, by the modification of conventional feeding structure for the PIFA and IFA, can apply T matching theory to the new feeder. Therefore, inverted ${\pi}$ feeder based on the T matching theory makes higher radiation resistance, and also increases the gain. To verify inverted ${\pi}$ feeding effect, feeder is applied to GSM/DCS dual band conventional PIFA, and measured return loss and patterns. By measurement, it's shown that this new feeding antenna has $0.23{\sim}0.84$ dB higher average gain for GSM band and $0.01{\sim}1.74$ dB higher average gain for DCS band than conventional fed PIFA without resonant frequency change.
Keywords
Inverted ${\pi}$ Feeder; Internal Antenna; Dual Band; PIFA;
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