US3633131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water load
Assignee: PREMIER MICROWAVE OF CALIFORNIA Inc
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Filing: 1970-04-24
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Granted: 1972-01-04
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Expires: 1990-04-24
Abstract
Abstract A radio frequency water load is disclosed having a loss section of transmission line. The loss section of transmission line includes a delay line portion for slowing the group velocity of wave energy traveling in the loss section. Conduits are arranged for directing a stream of wave-attenuative liquid through the loss section in wave-energy-exchanging relation with wave energy on the delay line for attenuating the wave energy, whereby the physical length of the loss section is reduced for a given amount of attenuation. In a preferred embodiment, the loss section is a section of coaxial line and the inner conductor is a helical delay line.
Inventors
- 👤 Richard B Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:08
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/24; H01P1/26; H01P1/262
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
139 words
In a load for dissipating electromagnetic energy in a transmission line into a liquid coolant, a loss section of coaxial transmission line having a portion of the inner conductor thereof comprising a delay-line portion, and means for directing a stream of wave attenuative liquid through said loss section of line in wave-energy-exchanging relation with the wave energy on said delay-line for attenuating the wave energy, whereby the physical length of said loss section is reduced for a given amount of attenuation, and further including a dielectric structure interposed in said delay-line between said inner conductor and said outer conductor, said dielectric structure having a dielectric constant substantially less than the dielectric constant of the wave-attenuative liquid to be passed through said loss section of coaxial line for reducing the dielectric loading of the loss section of the coaxial line.
Claim 2
Dependent Claim
139 words
In a load for dissipating electromagnetic energy in a transmission line into a liquid coolant, a loss section of coaxial transmission line having a portion of the inner conductor thereof comprising a delay-line portion, and means for directing a stream of wave attenuative liquid through said loss section of line in wave-energy-exchanging relation with the wave energy on said delay-line for attenuating the wave energy, whereby the physical length of said loss section is reduced for a given amount of attenuation, and further including a dielectric structure interposed in said delay-line between said inner conductor and said outer conductor, said dielectric structure having a dielectric constant substantially less than the dielectric constant of the wave-attenuative liquid to be passed through said loss section of coaxial line for reducing the dielectric loading of the loss section of the coaxial line.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 wherein said delay-line inner conductor is a helix or topologically equivalent helix.
Claim 4
Dependent Claim
39 words
The apparatus of claim 1 including a conductive end closing wall disposed at the terminal end of said loss section and interconnecting said inner delay-line and said outer conductor to provide a wave reflective termination for said loss section.
Claim 5
Dependent Claim
46 words
The apparatus of claim 1 wherein said delay-line has a portion with tapered dimensions in the direction of power flow within said loss section for gradually decreasing the axial group velocity of wave energy traveling on said inner delay-line in a direction of power flow therealong.
Claim 6
Dependent Claim
35 words
The apparatus of claim 4 wherein said inner delay-line is a helix and wherein the tapered dimension of said helix is the diameter, such diameter increasing in the direction of power flow on said helix.
Claim 7
Dependent Claim
20 words
The apparatus of claim 1 wherein said dielectric structure comprises a dielectric sleeve disposed coaxially of and surrounding said delay-line.
Claim 8
Dependent Claim
33 words
The apparatus of claim 1 wherein said means for directing a stream of wave attenuative liquid through said loss section includes means for immersing said delay-line in the stream of wave attenuative liquid.
Claim 9
Dependent Claim
63 words
The apparatus of claim 1 including a liquid-impervious dielectric wave-permeable structure sealed across said loss section of coaxial line between said inner conductor and said outer conductor at the wave energy input end of said loss section for partitioning an attenuative liquid-filled portion of said loss section from an input coaxial-line section to be connected to the input end of said loss section.
Claim 10
Dependent Claim
31 words
The apparatus of claim 8 wherein said dielectric partitioning structure is a disc, and including inductive reactive means disposed at said disc for impedance-matching said disc to said liquid-filled loss section.
Claim 11
Dependent Claim
69 words
The apparatus of claim 1 wherein said liquid-filled loss section of coaxial line proximate said partitioning wave-permeable structure is dimensioned to have a characteristic impedance when filled with attenuative liquid which is substantially equal to the characteristic impedance of said coaxial line proximate the side of said partitioning wave-permeable structure opposite to said liquid-filled side to provide a broadband substantially wave-reflectionless transmission line transition to said liquid-filled loss section.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |