Reconfigurable independent multiband printed inverted F-antenna for wireless USB applications

A novel reconfigurable independent multiband CPW fed printed inverted F-antenna is presented in this paper for USB and wireless communication applications. The proposed antenna consists of four arms CPW fed IFAs loaded with four capacitive plates for size reduction. To avoid frequency steering problem, four varactor diodes are added. Varactor diodes with variable capacitors are added on each printed-IFA arms to electrically and independently tune the operating resonant frequencies over a wide frequency range. The size of the USB antenna is 16 × 20 mm² which makes it easy to be integrated into USB package. Depending on the voltage applied to the vractor diode, the resonant frequencies could be operated at 1.3 GHz, 1.6 GHz, 2.8 GHz and 4.9 GHz and could be tuned over frequency range 11.5%, 12.5%, 25% and 28.5%, respectively from its resonant frequency. i.e., it covers several communication standards. The radiation patterns are provided. Very good agreements are achieved between measurements and EM simulations with the theoretical predictions.