The highest -factor resonators employ whispering gallery modes in single-crystal sapphire but have poor temperature stability. Rutile was the first dielectric material used to construct a microwave dielectric resonator. However, its very high temperature coefficient of permittivity made it unsuitable for practical applications. This paper reports a high -factor (50 000) and temperature-stable spherical Bragg reflector resonator based on polycrystalline rutile operating at 29.9 GHz. Temperature stability is achieved by adjusting the electric filling factor of a spherical shell so that in combination with its highly negative temperature coefficient of permittivity, the effect of thermal expansion is exactly cancelled out.
REFERENCES
1.
2.
3.
4.
A.
Okaya
, Proc. IRE
48
, 1921
(1960
).5.
A.
Okaya
and L. F.
Barash
, Proc. IRE
50
, 2081
(1962
).6.
S. B.
Cohn
, IEEE Trans. Microwave Theory Tech.
MTT-16
, 1628
(1968
).7.
M. E.
Tobar
, J.
Krupka
, E. N.
Ivanov
, and R. A.
Woode
, J. Appl. Phys.
83
, 1604
(1998
).8.
A.
Templeton
, X.
Wang
, S. J.
Penn
, S. J.
Webb
, L. F.
Cohen
, and N. M.
Alford
, J. Am. Ceram. Soc.
83
, 95
(2000
).9.
D.
Masse
, R.
Pucel
, D.
Readey
, E.
Maguire
, and C.
Hartwig
, Proc. IEEE
59
, 1628
(1971
).10.
J.
Plourde
, D.
Linn
, H.
O’Bryan
, Jr., and J.
Thompson
, Jr., J. Am. Ceram. Soc.
58
, 418
(1975
).11.
M.
Tobar
, J.
Krupka
, J.
Hartnett
, E.
Ivanov
, and R.
Woode
, IEEE Trans. Ultrason. Ferroelectr. Freq. Control.
45
, 830
(1998
).12.
13.
M.
Tobar
, C.
Locke
, E.
Ivanov
, J.
Hartnett
, O.
Piquet
, and D.
Cros
, Electron. Lett.
39
, 293
(2003
).14.
M. E.
Tobar
, J. L.
Floch
, D.
Cros
, J.
Krupka
, J.
Anstie
, and J.
Hartnett
, IEEE Trans. Ultrason. Ferroelectr. Freq. Control
51
, 1054
(2004
).15.
16.
J.
Krupka
, M. E.
Tobar
, J.
Hartnett
, D.
Cros
, and J. L.
Floch
, IEEE Trans. Microwave Theory Tech.
53
, 702
(2005
).17.
M.
Gastine
, L.
Courtois
, and J.
Dormann
, IEEE Trans. Microwave Theory Tech.
15
, 694
(1967
).18.
D.
Kajfez
, IEEE Trans. Microwave Theory Tech.
32
, 941
(1984
).19.
20.
21.
Y.
Toloukian
, R.
Kirby
, R.
Taylor
, and T.
Lee
, Thermophysical Properties of Matter
(Plenum
, New York
, 1977
), Vol. 13
.22.
J.
Krupka
, A.
Cwikla
, M.
Mrozowksi
, R.
Clarke
, and M.
Tobar
, IEEE Trans. Ultrason. Ferroelectr. Freq. Control
52
, 1443
(2005
).© 2009 American Institute of Physics.
2009
American Institute of Physics
You do not currently have access to this content.