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

摘要

Loaded inverted-F antennas (LIFA's) suitable to be applied multiband operation in a portable device as an internal antenna having high gain property for mobile WiMAX, Wi-Fi, Bluetooth, and WLAN operation is presented. The proposed antennas are directly feed by coaxial connector. The antenna arms effectively control the excited resonant modes for the required operation. Total area occupies by the antennas are 24 × 37 mm2, and 29 × 37 mm2 in case of slightly loaded IFA (SLIFA), and moderately loaded IFA (MLIFA) respectively. The antennas contain an incredibly good peak gain of 8.31, 8.88, and 6.32 dBi and 8.48, 8.67, and 6.89 dBi for 2.3 GHz mobile WiMAX, 2.4 GHz WLAN/Bluetooth, and 5.8 GHz Wi-Fi operation for SLIFA and MLIFA respectively, with less than 0.84 dBi at lower operating band and less than 1.8 dBi at upper band gain variation within the 10 dB return loss bandwidth. In addition, the antennas have achievable bandwidth, return loss, and radiation characteristics.