Hermatically-sealed electrically-absorptive low-pass radio frequency filters and electro-magnetically lossy ceramic materials for said filters
OwnerHomer William Fogle, Jr.inventor
Life of this patent
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Abstract
An electromagnetically lossy liquid- or gas-tight fusion seal for use as a low pass radio frequency signal filter constructed as a matrix of glass binder and ferrimagnetic and/or ferroelectric filler. Metal cased electrical filters are made by reflowing the material to form fused glass-to-metal seals and incorporating electrical thru-conductors therein which may be formed as inductive windings.
Claims5
A combination filter-seal assembly of a monolithic combination electrical low-pass radio frequency absorbent filter and mechanical gas-tight seal apparatus,
- said filter-seal assembly comprising
- an electrically conductive metallic casing having a passageway therethrough and an interior wall,
- at least one metallic electrode extending through said passageway and not contacting said casing, and
- a solid plug means of ceramic material for attenuating high frequency electrical signals and for blocking the passage of gas through the passageway, said attenuating and blocking means including
- a solid electromagnetically lossy ceramic substantially gas-impermeable plug fused to the interior wall of said casing passageway and
- said electromagnetically lossy substantially gas-impermeable plug being fused to said electrode so as to embed said electrode within said plug and completely span the remaining free cross section of said passageway,
- including a mechanical and chemically bonded gas-tight fusion joint between the plug and the metallic casing;
- and
- a mechanically and chemically bonded gas-tight fusion joint between the plug and the electrodes;
- thereby forming a gas-tight electromagnetically lossy seal
- said plug being electromagnetically lossy and gas-impermeable.
In an electrical connector, combination filter-seal assembly of a monolithic combination electrical low-pass radio frequency absorbent filter and mechanical gas-tight seal apparatus,
- said filter-seal assembly comprising
- an electrically conductive metallic casing having a passageway therethrough and an interior wall,
- at least one metallic electrode extending through said passageway and not contacting said casing, and
- a solid plug means of ceramic material for attenuating high frequency electrical signals and for blocking the passage of gas through the passageway, said attenuating and blocking means including
- a solid electromagnetically lossy ceramic substantially gas-impermeable plug fused to the interior wall of said casing passageway and
- said electromagnetically lossy substantially gas-impermeable plug being fused to said electrode so as to embed said electrode within said plug and completely span the remaining free cross section of said passageway,
- including a mechanical and chemically bonded gas-tight fusion joint between the plug and the metallic casing;
- and
- a mechanically and chemically bonded gas-tight fusion joint between the plug and the electrodes;
- thereby forming a gas-tight electromagnetically lossy seal
- said plug being electromagnetically lossy and gas-impermeable.
Dependencies are inferred from the claim text.