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High Gain Multiband Loaded Inverted-F Antennas for Mobile WiMAX, Wi-Fi, Bluetooth and WLAN Operation

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Author(s): Debabrata Kumar Karmokar, Khaled Mahbub Morshed, Abu Md. Numan-Al-Mobin & A. N. M. Enamul Kabir

Journal: International Journal of Engineering
ISSN 1985-2312

Volume: 4;
Issue: 3;
Start page: 219;
Date: 2010;
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Keywords: Inverted-F antenna | Loaded inverted-F antenna | Worldwide interoperability for microwave access (WiMAX) | Wireless-Fidelity (Wi-Fi) | Bluetooth | Wireless local area network (WLAN).

ABSTRACT
Multiband loaded inverted-F antennas (LIFA’s) suitable to be applied in aportable device as an internal antenna having high gain property for mobileWiMAX, Wi-Fi, Bluetooth and WLAN operation are presented. The proposedantennas are directly feed by 50 Ω coaxial connector. The antenna armseffectively control the excited resonant modes for the required operation. Totalareas occupied by the antennas are 24 × 37 and 29 × 37 mm2 in case of slightlyloaded IFA (SLIFA) and moderately loaded IFA (MLIFA) respectively. Theantennas contain an incredibly high peak gains of 8.31, 8.88 and 6.32 dBi and8.48, 8.67 and 6.89 dBi for 2.3 GHz mobile WiMAX, 2.4 GHz WLAN/Bluetoothand 5.8 GHz Wi-Fi operation for SLIFA and MLIFA respectively, with less than0.84 and 1.8 dBi gain variation at lower and upper operating band within the 10dB return loss bandwidth. In addition, the antennas have achievable bandwidth,return loss and radiation characteristics.
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