Frequency fine adjusting of LTCC microwave resonators based on BZN ceramics

BZN-based ceramics with low sintering temperature were prepared using a conventional route. Green sheets of ceramics were formed using tape casting technique. The laminated tapes were pressed together for forming multilayer microwave resonators. The green chips were sintered at about 950 °C. In order to adjust the resonant frequency of resonator, the width of the ground terminal electrode of the stripline can be changed. When the width of the ground terminal electrode varied from 1.0 to 2.4 mm, the resonant frequency of resonator changed from 0.971 GHz to 0.986 GHz. As the width of the ground terminal electrode increased, the resonant frequency of resonator varied slowly and then saturated. The maximum adjusting value of the resonant frequency of resonator is about 1.5%.