Multiband loaded inverted-F antennas suitable to be applied in a portable device as an internal antenna having high gain property for mobile WiMAX , Wi-Fi, Bluetooth and WLAN operations are presented. Numerical simulation is carried out using method of moments in Numerical Electromagnetic Code (NEC-2). The proposed dual inverted-F antenna is suitable for 3.5/5 GHz and compact triple band inverted-F antenna is for 2.4/3.5/5.2 GHz operations. Total areas occupied by the antennas are 24mm×37mm and 29mm×37mm in case of dual IFA and triple IFA respectively. The antennas contain an incredibly high peak gain of 7.72 dBi at 5 GHz band and the gain variations at all frequency bands are less than 1 dBi . In addition, the antennas have satisfactory radiation characteristics at all the frequency bands. Due to compact area occupied, the proposed antennas are promising to be embedded within the different portable devices.
KEYWORDS
Inverted-F Antenna, WiMAX, Wi-Fi, WLAN, Bluetooth
1. INTRODUCTION
Wireless communications have been developed widely and rapidly in the modern world especially during the last decade. In the near future, the development of the personal communication devices will aim to provide image, DMB (Digital Multimedia Broadcasting) video telephony, speech and data communications at any time-anywhere around the world using the WLANs (Wireless Loca Area Networks). Rapid advances of various WLAN protocols have sparked the requirement for miniaturized multiband antennas with suitable frequency bands appropriate for the Wi-Fi (IEEE 802.11 standard) and mobile WiMAX (IEEE 802.16e-2005 standard) applications are highly desirable. Bluetooth and WLAN operate in 2.4 GHz industrial, scientific and medical (ISM) band (frequency ran...
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