Entity

Time filter

Source Type


Tong X.,Wuxi Qinge Electronics Science and Technology Co. | Tong X.,Nanjing University | Zhong S.,Wuxi Qinge Electronics Science and Technology Co.
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2011

By using coupling of modes theory, the effects of some key factors including the relative film thickness, the ratio of the grating to the IDT period and the common grounded bus bar width between two resonators on the relative attenuation of the corresponding sidelobe of the high-order mode of the transversal coupling resonator filter with respect to the main pass band. The sidelobe caused by the high-order mode has been suppressed in designing the transversal coupling resonator filter operating at 159.2 MHz frequency. The simulation results and the measured data of the filter have been given. The fabricated device has been characterized by the high stop band rejection(50 dB of out-of-band rejection), low insertion loss(2.9 dB) and flat pass band(the ripple less than 0.3 dB) as well as bandwidth of 130 kHz at 1 dB. It showed that the theorical and experimental results agreed well. Source


Tong X.,Nanjing University | Tong X.,Wuxi Qinge Electronics Science and Technology Co. | Zhong S.,Wuxi Qinge Electronics Science and Technology Co. | Zhu H.,Wuxi Qinge Electronics Science and Technology Co. | Wang X.,Wuxi Qinge Electronics Science and Technology Co.
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2012

By using coupling of modes theory, the relation of pass band ripple and the gap between coupling IDT and input/output IDT is studied. The dry etching process for making mental Al in longitudinal coupling resonator filter is discussed. The Simulation results for experimental filter (center frequency 900 MHz) and experimental results corresponding to the filter are presented in the paper. Measured insertion loss is 3.85 dB; attenuation of stop band rejection to main pass band is 50 dB. The 1 dB pass band-width is 25.9 MHz; 3 dB pass band-width is 28.7 MHz with pass band ripple of about 0.7 dB. Theoretical results agree well with experimental results. Source

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