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Primary Examiner: Borchelt, Archie R.
Assistant Examiner: Nussbaum, Marvin
Attorney: Nilsen; W. G.

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Title: Devices using low loss dielectric material

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Claims: What is claimed is:

1. An apparatus for processing microwave electrical energy comprising a dielectric material for interaction with the microwave electrical energy a means for introducing microwave electrical energy to the dielectric material and a conducting member to contain the microwave electrical energy in the apparatus characterized in that the dielectric material consists essentially of a composition made up of ingredients that yields 18.0 - 19.0 mole percent divalent metal oxide remainder tetravalent metal oxide in which of the total amount of divalent metal oxide 0 - 0.4 mole percent is a metal oxide other than BaO, remainder BaO and of the total amount of tetravalent metal oxide 0 - 7 mole percent is metal oxide other than TiO.sub.2, remainder TiO.sub.2.

2. The apparatus of claim 1 in which the ingredients consist essentially of said divalent metal oxide and said tetravalent metal oxide.

3. The apparatus of claim 1 in which the divalent metal oxide consists essentially of BaO and the tetravalent metal oxide consists essentially of TiO.sub.2.

4. The apparatus of claim 1 in which said ingredients yield 18.1 - 18.3 mole percent divalent metal oxide remainder tetravalent metal oxide.

5. The apparatus of claim 4 in which the divalent metal oxide consists essentially of BaO and the tetravalent metal oxide consists essentially of TiO.sub.2.

6. The apparatus of claim 1 in which the dielectric material consists essentially of a compound with approximate nominal formula Ba.sub.2 Ti.sub.9 O.sub.20.

7. The apparatus of claim 1 which include at least one dielectric resonator in the shape of a right cylinder with dimension such that it is resonant at a particular microwave frequency.

8. The apparatus of claim 6 which includes a bandpass filter in which the means for introducing microwave electrical energy to the dielectric material is a stripline which is interrupted and at least one dielectric resonator is placed between the interrupted stripline.

9. The apparatus of claim 6 which includes a band reject filter which rejects a band of microwave frequencies in which the means for introducing microwave electrical energy to the dielectric material is a stripline which is continuous through the structure so as to form in the absence of dielectric resonators a propagating structure and in which at least one dielectric resonator is located in the structure spaced from each other at odd multiples of a quarter structure wavelength of the microwave frequency band to be rejected.

10. The apparatus of claim 6 which includes a complementary filter made up of two exit arms one of which is a bandpass filter for a particular microwave frequency and the other exit arm is a band reject filter for the same microwave frequency.
Other info:

Inventors: O'Bryan, Jr., Henry Miles (Plainfield, NJ, US)
Pluorde, James Kevin (Allentown, PA, US)
Thomson, Jr., John (Monmouth County, NJ, US)

Application Number: 484559
Filing Date: 1974-07-01
Publication_date: 1976-02-10
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 333/204 423/598, 501/137
Other Classes:
US Patent Ref:
Other Refs: Other References: rase et al., - Phase Equilibria in the System BaO-TiO.sub. 2 in Journal of the American Ceramic Society, Vol. 38, No. 3, Mar. 1955; pp. 102-113.