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)

The E -field and frequency dependences of radiation patterns of (a) E plane and (b) H plane. The black square (■) refers to 0 kV/cm@9.1 GHz, the red circle (●) 5.0 kV/cm@9.6 GHz, the blue triangle (▲) 6.67 kV/cm@9.9 GHz, and the dark-cyan pentagram (★) 8.33 kV/cm@10.1 GHz.