Dielectric filter
FIG. 1 is a top plan view of a first embodiment of the piezoelectric filter of the present invention; 
     FIG. 2 is a front elevation view of the piezoelectric filter depicted in FIG. 1; 
     FIG. 3 is a right side elevation view of the piezoelectric filter depicted in FIG. 1; 
     FIG. 4 is a left side elevation view of the piezoelectric filter depicted in FIG. 1; 
     FIG. 5 is a bottom plan view of the piezoelectric filter depicted in FIG. 1; 
     FIG. 6 is a rear view of the piezoelectric filter depicted in FIG. 1; 
     FIG. 7 is a cross-sectional view of the piezoelectric filter depicted in FIG. 1 taken along the line 7--7 in FIG. 1; 
     FIG. 8 is a cross-sectional view of the piezoelectric filter depicted in FIG. 2 taken along the line 8--8 in FIG. 2; 
     FIG. 9 is a perspective view showing the upper and front side surfaces of the piezoelectric filter depicted in FIG. 1; 
     FIG. 10 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 1; 
     FIG. 11 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a second embodiment of the present invention; 
     FIG. 12 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 11; 
     FIG. 13 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a third embodiment of the present invention; 
     FIG. 14 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 13; 
     FIG. 15 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a fourth embodiment of the present invention; 
     FIG. 16 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 15; 
     FIG. 17 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a fifth embodiment of the present invention; 
     FIG. 18 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 17; 
     FIG. 19 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a sixth embodiment of the present invention; 
     FIG. 20 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 19; 
     FIG. 21 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a seventh embodiment of the present invention; 
     FIG. 22 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 21; 
     FIG. 23 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of an eighth embodiment of the present invention; 
     FIG. 24 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 23; 
     FIG. 25 is a perspective view showing the upper and front side surfaces of the piezoelectric filter of a ninth embodiment of the present invention; 
     FIG. 26 is a perspective view showing the lower and rear surfaces of the piezoelectric filter depicted in FIG. 25; 
     FIG. 27 is a top plan view of a tenth embodiment of the piezoelectric filter of the present invention; 
     FIG. 28 is a front elevation view of the piezoelectric filter depicted in FIG. 27; 
     FIG. 29 is a side elevation view of the piezoelectric filter depicted in FIG. 27; 
     FIG. 30 is a bottom plan view of the piezoelectric filter depicted in FIG. 27; 
     FIG. 31 is a rear view of the piezoelectric filter depicted in FIG. 27; 
     FIG. 32 is a cross-sectional view of the piezoelectric filter depicted in FIG. 27 taken along the line 32--32 in FIG. 27; 
     FIG. 33 is a perspective view showing the upper and front surfaces of the piezoelectric filter depicted in FIG. 27; 
     FIG. 34 is a perspective view showing of an eleventh embodiment of the piezoelectric filter of the present invention, the bottom, rear and left side being the same as the tenth embodiment except for the central channel on the bottom surface; and, 
     FIG. 35 is a perspective view showing of a twelfth embodiment of the piezoelectric filter of the present invention, the bottom, rear and left side being the same as the tenth embodiment.