Abstract—Compound reconfigurable antennas have been studied in recent research for modern wireless communication systems due to their advantage of multifunctional capabilities. In this paper, a novel composed structure of frequency and radiation pattern reconfigurable antenna is proposed. The antenna uses four pseudo-Fibonacci curves and the E shape of Defected Ground Structures (DGS) to make the varied directivity radiation. The steering beam along can achieve based on the position of the active PIN diode in different directions. The resonant frequency can also switch from one to other bands depending on the number of active PIN diodes. The antenna gets a compact size of 30mm x 30mm x 1.6mm that can be fit on a small form factor while still being able to scan along with 8 radiation directions of 0°, 90°, 180°, 270°, or 45°, 135°, 225°, 315° and 4 frequencies at 3.5GHz and 5GHz bands. The antenna directivity reaches 2.283dBi and 4.185dBi at 3.5GHz and 5GHz bands, respectively. The simulation, measurement, and experiment results agree well to ensure the proposed reconfigurable antenna can apply for terminals in 5G IoT, 5GHz WLAN, or cognitive radio systems.
 

Index Terms—Reconfigurable antenna, fibonacci, DGS

Cite: Cao Xuan Son, Duong Thi Thanh Tu, Nguyen Thi Thu Nga, Nguyen Tan Dung, and Nguyen Van Tan, "A Frequency and Radiation Pattern Reconfigurable Antenna Using Composed Structure of Pseudo-Fibonacci and DGS for 5G IoT/ WiFi 6/CR Applications," Journal of Communications vol. 17, no. 12, pp. 1003-1008, December 2022. Doi: 10.12720/jcm.17.12.1003-1008