SAW filter

Fig. 6.34 (a) Trapped-energy filter, (b) Surface acoustic wave (SAW) filter. 

Xu G., Direct finite element analysis of the frequency response of a Y-Z LiNbOj SAW filter. Smart Mater. Struct., 9, 973-980, 2000. 

LiTaOj (LB Number 2A-2). This crystal is ferroelectric below 620 °C. The coercive field is large. The crystal is useful for piezoelectric elements, for linear and nonlinear optical elements, and for SAW filters in communications technology (Figs. 4.5-34 and 4.5-35). 

The processed video is converted to ampHtude modulation of an IF frequency, either on a carrier generated by a crystal oscillator or by a frequency synthesizer. The modulated IF is band-shaped in a vestigial sideband filter using a surface-acoustic-wave (SAW) filter. Envelope delay correction is not required for the SAW filter because of the uniform delay characteristics of the device. Envelope-delay compensation may, however, be needed for other parts of the transmitter. The SAW filter provides many benefits to transmitter designers and operators because it requires no adjustments and is stable with respect to temperature and time. Envelope-delay compensation, however, might be required for other parts of the transmitter. 

The compositional variation in terms of the Ga/Si ratio in D site greatly afiects the uniformity of the grown crystal, which reflects the distribution of SAW velocities [26]. About 600 transversal SAW filters of the 190 MHz central frequency were... 

Reception in the S-band is enabled by the same antenna and by the experimental S-band front-end. This front-end includes the extra-low noise wideband amplifier with high dynamics (G= 15 dB, B> 700 MHz, IP3> 30 dBm) (Dobes, 2014) and the SAW filter. 

Chen, Y.Y., Wu, T.T. and Chou, T.T. (2004) Analysis of the frequency response of a dispersive IDT/ZnO/sapphire SAW filter using effective permittivity and the coupling of modes model. Journal of Physics D Applied Physics, SI, 120. 

Zhang, V.Y., Lefebvre, J.Z. and Cryba, T. (2001) SAW characteristics in a layered ZnO/CaAs structure for design of integrated SAW filters. Proceedings of the IEEE Ultrasonic Symposium, 1, 261. 

Kadota, M. and Kando, H. (2004) Small and low-loss IF SAW filters using zinc oxide film on quartz substrate. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, 51, 464. 

Fujii, S., Tanabe, K., Seki, Y. and Shikata, S. (1997) High frequency SAW filter on diamond. IEEE MTT-S Digest. 2. 

Nakahata. H.. Hachigo, A.. Itakiua, K. and Shikata, S. (2000) Fabrication of high frequency SAW filters from 5 to IOC Hz using Si02/ZnO/diamond structure. Proceedings of the IEEE Ultrasonic Symposium, 1, 349. 

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