Patent ID: 6337531
Filing Date: 2002-01-08
Classification: H03H

Abstract:
A SAW device that utilizes a SAW of the 0th-order mode comprising a diamond substrate, a KNbO3 layer formed on the diamond substrate, and IDTs, wherein:(a) the IDTs are formed on the KNbO3 layer; (b) a short-circuiting electrode is provided between the KNbO3 layer and the diamond substrate; and (c) the KNbO3 layer is composed of a single crystal having a layer thickness t1 and a crystal orientation (&thgr;, &psgr;, &phgr;) as defined in the following Tables and equations: a coordinate (x, y, z) which represents the crystal orientation (&thgr;, &psgr;, &phgr;) within a realm Vn of an octagonal prism having opposite octagonal planes, one of which has eight vertexes represented by (xn, 1, yn, 1, zn), (xn, 2, yn, 2, zn), (xn, 3, yn, 3, zn), (xn, 4, yn, 4, zn), (xn, 5, yn, 5, zn), (xn, 6, yn, 6, zn), (xn, 7, yn, 7, zn), (xn, 8, yn, 8, zn) and the other of which has eight vertexes represented by (xn+1, 1, yn+1, 1, zn+1), (xn+1, 2, yn+1, 2, zn+1), (xn+1, 3, yn+1, 3, zn+1), (xn+1, 4, yn+1, 4, zn+1), (xn+1, 5, yn+1, 5, zn+1), (xn+1, 6, yn+1, 6, zn+1), (xn+1, 7, yn+1, 7, zn+1), (xn+1, 8, yn+1, 8, zn+1), wherein the coordinates (xi, j, yi, j, zi) for the kh1 value (kh1=2&pgr;(t1/&lgr;) of 0.6 are as listed in Table 1, the coordinates (xi, j, yi, j, zi) for the kh1 value of 0.8 are listed in Table 2, the coordinates (xi, j, yi, j, zi) for the kh1 value of 1.0 are listed in Table 3, and the coordinates (xi, j, yi, j, zi) for the kh1 value of 1.4 are listed in Table 4, and wherein the coordinates (xi, j, yi, j, zi) for the kh1 value &agr; a that is larger than 0.6 and smaller than 1.4 and is not 0.8 and 1.0, are expressed by the following equations: x1,j&af;(Î±)=(xn,j-xm,j)&it;Î±+(bxm,j-axn,j)b-a&it;&NewLine;&it;y1,j&af;(Î±)=(yn,j-ym,j)&it;Î±+(bym,j-ayn,j)b-a&it;&NewLine;&it;z1&af;(Î±)=(zn-zm)&it;Î±+(bzm-azn)b-a(1)where the value kh1=a has the coordinates of the vertexes of (xm, j, Ym, j, zm) and the other value kh1=b has the coordinates of the vertexes of (xn, j, Yn, j, zn)and the values of m, n, and l for the individual ranges of kh1 are listed in Table 5,TABLE 1xi.1,xi.2,xi.3,xi.4,xi.5,xi.6,xi.7,xi.8,iyi.1yi.2yi.3yi.4yi.5yi.6yi.7yi.8z1195,105,105,100,90,80,85,90,6020â€‚15â€‚10â€ƒ0â€‚0â€‚01015295,105,105,105,75,80,85,7040â€‚35â€‚20â€ƒ0â€‚02035390,80,805035475,75,902035TABLE 2xi.1,xi.2,xi.3,xi.4,xi.5,xi.6,xi.7,xi.8,iyi.1yi.2yi.3yi.4yi.5yi.6yi.7yi.8z15â€‚95,105,105,105,90,75,80,85,50â€‚25â€‚15â€ƒ5â€ƒ0â€‚0â€‚010206â€‚95,110,110,110,70,70,80,60â€‚40â€‚30â€‚15â€ƒ0â€‚015357100,110,110,70,70â€‚50â€‚35â€‚20208100,110,75,85,80â€‚55â€‚402040TABLE 3xi.1,xi.2,xi.3,xi.4,xi.5,xi.6,xi.7,xi.8,iyi.1yi.2yi.3yi.4yi.5yi.6yi.7yi.8z1â€‚9â€‚95,105,105,105,90,75,80,85,40â€‚35â€‚25â€‚10â€ƒ0â€‚0â€‚0101510100,110,110,110,70,75,85,50â€‚30â€‚20â€‚10â€ƒ0â€‚0152511100,110,115,65,70,80,60â€‚40â€‚30â€‚25â€‚0203512105,115,115,75,85,70â€‚45â€‚30â€‚20â€‚0â€‚013100,115,115,95,70,75,85,80â€‚55â€‚40â€ƒ0â€‚0â€‚0153014â€‚90,100,100,105,90,75,80,80,90â€‚30â€‚15â€‚10â€ƒ0â€‚0â€‚01020TABLE 4xi.1,xi.2,xi.3,xi.4,xi.5,xi.6,xi.7,xi.8,iyi.1yi.2yi.3yi.4yi.5yi.6yi.7yi.8z115â€‚90,100,105,105,90,75,80,85,20â€‚15â€‚10â€ƒ5â€ƒ0â€‚0â€‚0â€‚51016100,115,115,115,70,75,80,30â€‚20â€‚15â€‚10â€ƒ0â€‚0â€‚01517100,110,110,65,70,80,40â€‚25â€‚20â€ƒ0â€‚0102018105,120,120,115,70,85,50â€‚35â€‚30â€‚15â€ƒ0153019110,115,60â€‚35â€‚3020105,110,110,110,70,75,70â€‚30â€‚25â€‚10â€ƒ0â€‚010TABLE 5kh1mnl0.6 < kh1 < 0.81â€‚62012â€‚72023â€‚82030.8 < kh1 < 1.05102046112057122068132071.0 < kh1 < 1.491720810â€‚1820911â€‚1921012â€‚20â€‰211.