Title :
The tunable properties of Mn doped (Ba, Sr)TiO3 thin film varactor at low temperature
Author :
Fengjin Xia;Xu Wang;Jia Wang;Yun Wu;Yongbo Bian;Chunguang Li;Xueqiang Zhang;Guoqiang Li;Dandan Bai;Hong Li;Liang Sun;Mu Sun;Yusheng He
Author_Institution :
National Laboratory for Superconductivity, Institute of Physics, and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
fDate :
7/1/2015 12:00:00 AM
Abstract :
Mn doped ferroelectric (Ba, Sr)TiO3 (Ba0.05Sr0.95Ti0.95Mn0.05O3, BSTM) thin films were prepared on the MgO single crystal substrate by using pulsed laser deposition technique. The dielectric properties of the varactor composed by this thin film was investigated by using a superconductor resonator at the liquid nitrogen temperature. Measurement results indicated that the thin film showed high quality-factor of up to 140, with a tunability of 72% at the bias voltage of 210 V. The loss tangent of the varactor varied from 0.02 to 0.008 with the bias changed from 0 V to 210 V. Both the low dielectric loss and tunable properties of the BSTM thin film varactor are useful for tunable microwave applications.
Keywords :
"Varactors","Dielectric losses","Dielectric loss measurement","Microwave theory and techniques","Yttrium","Manganese"
Conference_Titel :
Advanced Materials and Processes for RF and THz Applications (IMWS-AMP), 2015 IEEE MTT-S International Microwave Workshop Series on
DOI :
10.1109/IMWS-AMP.2015.7324956
