US4216449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide for the transmission of electromagnetic energy
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1978-01-12
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Granted: 1980-08-05
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Expires: 1998-01-12
Abstract
Abstract A waveguide for the transmission of electromagnetic energy which has a low attenuation even with a small line cross-section realized by disposing in the interior of an electromagnetically shielded hollow cylinder, consisting of a substance having a low permittivity, a dielectric wire of a substance having a high permittivity. An E om -wave (m = 1, 2, 3 . . . , circular H field) is excited in the dielectric wire and the dimensioning of the dielectric wire is such, depending on the permittivities of the two substances and the particular operating frequency, that a TEM wave develops at least substantially in the space in the dielectric hollow cylinder. In the simplest case, the electromagnetic shield can consist of a metal tube and the dielectric hollow cylinder can consist primarily of air. Furthermore, the E om wave excited in the dielectric wire is preferably the E 01 wave (TM 01 mode).
Inventors
- 👤 Alfred Kach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:14
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/16
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
A waveguide for the transmission of electromagnetic energy, comprising: a cylindrical metallic sheath functioning to guide forward electromagnetic waves; a wire-shaped body disposed coaxially in the interior of said sheath, said sheath and said wire-shaped body defining an intermediate space therebetween; a medium having a low dielectric constant (ε 2 ) located in the space between said sheath and the wire-like body: said wire-shaped body consisting solely of a dielectric material exhibiting a high dielectric constant (ε 1 ) such that an E om wave (circular H field) can be excited only in the dielectric wire-shaped body, the dimensioning of the dielectric wire-shaped body being such, depending on the dielectric constants ε 2 and ε 1 , and the particular operating frequency, so that a substantially pure TEM wave can develop at least substantially in the intermediate space.
Claim 2
Dependent Claim
138 words
A waveguide for the transmission of electromagnetic energy, comprising: a cylindrical metallic sheath functioning to guide forward electromagnetic waves; a wire-shaped body disposed coaxially in the interior of said sheath, said sheath and said wire-shaped body defining an intermediate space therebetween; a medium having a low dielectric constant (ε 2 ) located in the space between said sheath and the wire-like body: said wire-shaped body consisting solely of a dielectric material exhibiting a high dielectric constant (ε 1 ) such that an E om wave (circular H field) can be excited only in the dielectric wire-shaped body, the dimensioning of the dielectric wire-shaped body being such, depending on the dielectric constants ε 2 and ε 1 , and the particular operating frequency, so that a substantially pure TEM wave can develop at least substantially in the intermediate space.
Claim 3
Dependent Claim
25 words
The waveguide as claimed in claim 1, wherein the E om wave excited in the dielectric wire is an E 01 wave (TM 01 mode).
Claim 4
Dependent Claim
70 words
The waveguide as claimed in claim 1, wherein the permeability μ 2 of the medium and the permeability μ 1 of the dielectric wire-shaped body are equal to the vacuum permeability μ 0 , and the dielectric constant ε 2 of the medium is at least substantially equal to the vacuum dielectric constant ε 0 , while the dielectric constant ε 1 of the dielectric wire-shaped body is considerably higher.
Claim 5
Dependent Claim
23 words
The waveguide as claimed in claim 1, wherein the medium in the space between said sheath and said wire-shaped body is predominantly air.
Claim 6
Dependent Claim
17 words
The waveguide as claimed in claim 1, wherein the metallic sheath is a circular cylindrical metal tube.
Claim 7
Dependent Claim
18 words
The waveguide as claimed in claim 1, wherein the metallic sheath consists of a cylindrical metallic wire gauze.
Claim 8
Dependent Claim
18 words
The waveguide as claimed in claim 1, wherein the wire-shaped body has at least a substantially circular cross-section.
Claim 9
Dependent Claim
22 words
The waveguide as claimed in claim 1, wherein the dielectric wire-shaped body is disposed concentrically in the interior of the metallic sheath.
Claim 10
Dependent Claim
16 words
The waveguide as claimed in claim 1, wherein the dielectric wire-shaped body comprises a plastic material.
Claim 11
Dependent Claim
17 words
The waveguide as claimed in claim 1, wherein the dielectric wire-shaped body consists of a ceramic material.
Claim 12
Dependent Claim
17 words
The waveguide as claimed in claim 1, wherein the dielectric wire-shaped body consists of a glass wire.
Claim 13
Dependent Claim
15 words
The waveguide as claimed in claim 1, wherein the dielectric wire-shaped body comprises a liquid.
Claim 14
Dependent Claim
19 words
The waveguide as claimed in claim 12, said wire-shaped body further comprising: a flexible tube filled with said liquid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |