Microwave dielectric ceramic
View Patent ↗A dielectric ceramic material as claimed in claim 1 with a composition of formula x CaTiO 3 +(1−x)Sm z Re (1−z) AlO 3 (1) optionally doped with about 0.005% to about 5% of CeO 2 as a dopant, wherein 0.5≦x≦0.9, 0.3≦z≦0.995, or Re may be selected from a group consisting of La, Pr, Dy, Gd, Y, Er, Ho and mixtures thereof.
1. A dielectric ceramic material with a composition of Formula (1)
x CaTiO 3 +(1−x)Sm z Re (1−z) AlO 3 (1)
wherein 0.65≦x≦0.72
0.8≦z≦0.995
Re is selected from the group consisting of La and Y and mixtures thereof.
2. A dielectric ceramic material as claimed in claim 1 with a composition of Formula (2)
x CaTi 1.03 O 3 +(1−x)Sm 0.95 Y 0.05 AlO 3 (2)
wherein 0.65≦x≦0.72.
3. A dielectric ceramic material as claimed in claim 1 with a composition of formula (3)
x CaTi 1.03 O 3 +(1−x) Sm 0.8 Y 0.2 AlO 3 (3)
wherein 0.65≦x≦0.72.
4. A dielectric ceramic material as claimed in claim 1 , wherein Sr, Mg or a mixture thereof are substituted for Ca in an amount of 0 to 20 mol %.
5. A dielectric ceramic material as claimed in claim 1 , including a dopant, wherein the dopant is selected from the group consisting of: CeO 2 , Nb 2 O 5 , Ga 2 O 3 , and mixtures thereof, wherein the total amount of dopant is from about 20 ppm to 2 wt %.
6. A dielectric ceramic material as claimed in claim 5 , wherein CeO 2 is added as a dopant in the range about 50 ppm to about 2.0 wt %.
7. A dielectic ceramic material as claimed in claim 1 , wherein the cation site occupancy of Ca, Ti, Re and Al is varied by ±10%.
8. A dielectric resonator comprising a dielectric ceramic material as claimed in claim 1 .