Ultrahigh frequency tunability of aperture-coupled microstrip antenna via electric-field tunable BST

Du Hong-Lei^a), Xue Qian^a), Gao Xiao-Yang^a), Yao Feng-Rui^a), Lu Shi-Yang^a), Wang Ye-Long^b), Liu Chun-Heng^c), Zhang Yong-Cheng^a), Lü Yue-Guang^b), Li Shan-Dong†^a),^d)

(a) Side view of the schematic FRC antenna with a BST–MgO of t _B = 0.3 mm and Taconic of t _T = 1 mm in thickness; (b) the prototype of the designed FRC aperture-coupled microstrip antenna.