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Wafers and Substrates

SAW Wafers and Crystals

A Surface Acoustic Wave (SAW) device is a device that transfers the input electrical signal into acoustic signal through the converse piezoelectric effects or vice versa, The acoustic wave propagates along the surface of the SAW substrates or wafer, and eventually the acoustic signal will be transferred into electrical signal at the other terminal of the substrates . SAW devices provide wide application possibilities across the fields of radio and television, mobile and wireless telephone, satellite communication, GPS system, identification system (e.g. electronic tag) etc.. Where SAW devices are used as filters, oscillators, correlators and delay line etc. Especially in the mobile communication industry, SAW devices are the essential components that determines the efficiency of information transmission. SAW devices continue to be of interest because of their superior functional characteristics in delay lines, filters, and other UHF, VHF and microwave devices.

SAW wafers or substrates are crucial parts of the SAW device to attain the energy conversion between mechanic wave and electrical signal. Because the velocity of SAW is extremely low, it is very conventional to sample signals and alternate them when the signals travel between the two terminals.

Since the discovery of piezoelectric effects in crystals such as quartz and tourmaline by French scientists Curie brother in 1880, research developed manifolds of new piezoelectric crystals in succession. Due to various factors, however, among those only a few types of materials could be actually industriously manufactured in bulk, majorly Quartz, Lithium Niobate (LiNbO3) and Lithium Tantalate (LiTaO3). Quartz possesses fine temperature stability, but its eletromechanical coupling coefficient is relatively low; LiNbO3 has great eletromechanical coupling coefficient but its negative temperature coefficient are also undesirably large; LiTaO3 has advantage over LiNbO3 in terms of temperature coefficient but its eletromechanical coupling coefficient does not even reach a quarter of LiNbO3’s.

Hangzhou Shalom EO has abundant experience in manufacturing surface acoustic wave substrates and is able to provide both off-the-shelf versions and custom versions of SAW wafers. LiNbO3, LiTaO3, Quartz and LGS SAW crystals ingots, wafer blanks, polished SAW wafers, up to 6 inches diameter are available.