U-Slot Dual-band Frequency Reconfigurable Patch Antenna Tuned With Commercial Ferroelectric BST capacitors

A U-slot dual-band frequency reconfigurable patch antenna is presented in this paper. The resonant frequencies of the antenna before loading with varactors are 1.3 GHz and 2.4 GHz. The tunability is achieved using p-n varactors and ferroelectric tunable capacitors. It is found that individual tuning for both frequency bands is possible depending on the capacitor position. The maximum tuning range achieved for the first band is 600 MHz and the same for the second band is 422 MHz. The minimum and maximum gain values for the lower band are found to be 4.25 dBi and 4.95 dBi, respectively. Similarly, for the upper band, those values are obtained as 6.77 dBi and 7 dBi, respectively.