Ceramic dielectric formulation for broad band UHF antenna
View Patent ↗A dielectric ceramic composition has a dielectric constant, K, of at least 200 and a dielectric loss, DF, of 0.0006 or less at 1 MHz. The dielectric ceramic composition may be formed by sintering by firing in air without a controlled atmosphere. The dielectric ceramic composition may have a major component of 92.49 to 97.5 wt. % containing 60.15 to 68.2 wt. % strontium titanate, 11.02 to 23.59 wt. % calcium titanate and 7.11 to 21.32 wt. % barium titanate; and a minor component of 2.50 to 7.51 wt. % containing 1.18 to 3.55 wt. % calcium zirconate, 0.50 to 1.54 wt. % bismuth trioxide, 0.2 to 0.59 wt. % zirconia, 0.02 to 0.07 wt. % manganese dioxide, 0.12 to 0.35 wt. % zinc oxide, 0.12 to 0.35 wt. % lead-free glass frit, 0.24 to 0.71 wt. % kaolin clay and 0.12 to 0.35 wt. % cerium oxide. UHF antennas and monolithic ceramic components may use the dielectric ceramic composition.
1. A broad band UHF antenna comprised of a dielectric ceramic composition containing more than 50 wt. % of a non-ferroelectric material, the dielectric ceramic composition having a dielectric constant, K, of at least 200 and a dielectric loss, DF, of 0.0006 or less at 1 MHz.
2. The broad band UHF antenna of claim 1 wherein the dielectric ceramic composition is formed into a sintered body by firing.
3. The broad band UHF antenna of claim 1 , wherein the dielectric ceramic composition has a dielectric constant, K, of at least 300 and a dielectric loss, DF, of 0.0005 or less at 1 MHz.
4. The broad band UHF antenna of claim 1 , wherein the dielectric ceramic composition is in the form of a monolithic ceramic component.
5. A dielectric ceramic composition having a dielectric constant, K, of at least 200 and a dielectric loss, DF, of 0.0006 or less at 1 MHz, and having a major component of 92.49 to 97.5 wt. % containing 60.15 to 66.80 wt. % strontium titanate, 11.02 to 23.59 wt. % calcium titanate and 7.11 to 21.32 wt. % barium titanate; and a minor component of 2.50 to 7.51 wt. % containing 1.18 to 3.55 wt. % calcium zirconate, 0.50 to 1.54 wt. % bismuth trioxide, 0.2 to 0.59 wt. % zirconia, 0.02 to 0.07 wt. % manganese dioxide, 0.12 to 0.35 wt. % zinc oxide, 0.12 to 0.35 wt. % lead-free glass frit, 0.24 to 0.71 wt. % kaolin clay and 0.12 to 0.35 wt. % cerium oxide.
6. A broad band UHF antenna comprised of the dielectric ceramic composition of claim 5 .
7. An electronic device comprised of the broad band UHF antenna of claim 6 .
8. A monolithic ceramic component comprised of the dielectric ceramic composition of claim 5 .
9. A ceramic dielectric material consisting essentially of a major component of 92.49 to 97.5 wt. % containing 60.15 to 66.80 wt.
10. The ceramic dielectric material of claim 9 wherein the dielectric ceramic material is formed into a sintered body by firing.
11. A broad band UHF antenna comprised of the ceramic dielectric material of claim 9 sintered into a substrate.
12. An electronic device comprised of the broad band UHF antenna of claim 11 .
13. A method of manufacturing, comprising: providing a ceramic dielectric material consisting essentially of a major component of 92.49 to 97.5 wt. % containing 60.15 to 66.80 wt. % strontium titanate, 11.02 to 23.59 wt. % calcium titanate and 7.11 to 21.32 wt. % barium titanate, and a minor component of 2.50 to 7.51 wt. % containing 1.18 to 3.55 wt. % calcium zirconate, 0.50 to 1.54 wt. % bismuth trioxide, 0.2 to 0.59 wt. % zirconia, 0.02 to 0.07 wt. % manganese dioxide, 0.12 to 0.35 wt. % zinc oxide, 0.12 to 0.35 wt. % lead-free glass frit, 0.24 to 0.71 wt. % kaolin clay and 0.12 to 0.35 wt. % cerium oxide; and firing the ceramic dielectric material.
14. The method of claim 13 wherein the step of firing the ceramic dielectric material is firing the ceramic dielectric material to sinter into a substrate.
15. The method of claim 14 wherein the substrate is associated with a UHF broadband antenna.
16. The method of claim 13 wherein the dielectric ceramic composition having a dielectric constant, K, of at least 200 and a dielectric loss, DF, of 0.0006 or less at 1 MHz.
17. The method of claim 13 wherein the dielectric ceramic composition having a dielectric constant, K, of at least 300 and a dielectric loss, DF, of 0.0005 or less at 1 MHz.
18. The method of claim 13 further comprising forming a monolithic ceramic component from the ceramic dielectric material.
19. The method of claim 13 wherein the step of firing the ceramic dielectric material includes firing the ceramic dielectric material to form a sintered body.
20. A dielectric ceramic composition, comprising: 60.15 to 66.80 wt. % strontium titanate, 11.02 to 23.59 wt. % calcium titanate, 7.11 to 21.32 wt. % barium titanate, 1.18 to 3.55 wt. % calcium zirconate, 0.50 to 1.54 wt.
21. A broad band UHF antenna comprised of the dielectric ceramic composition of claim 20 .
22. An electronic device comprised of the broad band UHF antenna of claim 21 .