EP0204103A2
Expired / Lapsed
EP
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Use of a low dielectric loss silicon nitride material in radome applications
Assignee: Osram Sylvania Inc
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Filing: 1986-04-08
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Granted: —
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Expires: 2006-04-08
Abstract
Abstract A composition having low dielectric constant and low dielectric loss tangent from room temperature to at least about 1100°C which comprises a silicon nitride based material containing an effective amount of a sintering aid selected from lanthanum oxide, yttrium oxide, lanthanum aluminate, yuttrium aluminate, aluminmum oxide and mixtures thereof and an effective amount of a low dielectric loss promotor selected from the group consisting of iron, chromium and mixtures thereof is a suitable radome material and electromagnetic window material.
Inventors
- 👤 Martin Y. Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 04:48
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/12; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/622; C04B35/626; C04B35/62605; C04B35/6261; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/3222; C04B2235/3224; C04B2235/3225; C04B2235/3227; C04B2235/3231; C04B2235/3241; C04B2235/3243; C04B2235/327; C04B2235/3272; C04B2235/40; C04B2235/404; C04B2235/405; C04B2235/70; C04B2235/74; C04B2235/77
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A composition consisting essentially of silicon nitride and an effective amount of a sintering aid selected from lanthanum oxide, yttrium oxide, aluminum oxide, lanthanum aluminate, yttrium aluminate and mixtures thereof and an effective amount of a low dielectric loss promotor selected from the group consisting of iron, chromium and mixtures, and their oxides or compounds wherein said composition has a dielectric constant of below about 8.0 at about 9.375 GHz at a temperature range of from about 25°C to about 1100°C and a loss tangent of less than about 1x10 -3 throughout said temperature range.
Claim 2
Dependent Claim
95 words
A composition consisting essentially of silicon nitride and an effective amount of a sintering aid selected from lanthanum oxide, yttrium oxide, aluminum oxide, lanthanum aluminate, yttrium aluminate and mixtures thereof and an effective amount of a low dielectric loss promotor selected from the group consisting of iron, chromium and mixtures, and their oxides or compounds wherein said composition has a dielectric constant of below about 8.0 at about 9.375 GHz at a temperature range of from about 25°C to about 1100°C and a loss tangent of less than about 1x10 -3 throughout said temperature range.
Claim 3
Dependent Claim
25 words
A composition according to Claim 1 wherein said low dielectric loss promotor is at a level of from about 0.05 to about 2% by weight.
Claim 4
Dependent Claim
25 words
A composition according to Claim 1 wherein said low dielectric loss promoter is at a level of from about 0.1% to about 2% by weight.
Claim 5
Dependent Claim
23 words
A composition according to Claim 2 wherein said sintering aid is at a level of from about 4% to about 20% by weight.
Claim 6
Dependent Claim
23 words
A composition according to Claim 3 wherein said sintering aid is at a level of from about 4% to about 20% by weight.
Claim 7
Dependent Claim
16 words
A composition according to Claim 5 wherein said sintering aid contains both lanthanum and aluminum oxides.
Claim 8
Dependent Claim
16 words
A composition according to Claim 4 wherein said sintering aid contains both yttrium and aluminum oxides.
References Cited (Backward Citations)
No citation records indexed.
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