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US3699582A Expired / Lapsed US ⏱️ 0.0 years remaining

Slotted cable glide slope antenna

Assignee: Individual
•
Filing: 1970-12-16
•
Granted: 1972-10-17
•
Expires: 1990-12-16
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Abstract

Abstract This invention relates to antennas for use in glide slope systems for the instrument landing of airplanes. The antenna disclosed here may be used, as a phase-compensating element, in an end-fire glide slope array, to control the slope angle over a desired azimuth sector. A coaxial transmission line, fed from one end, has a number of gaps in the outer conductor which leak current onto the outside surface of the line. The separation between gaps varies along the line, being chosen to give a predetermined phase distribution of the radiation current. Tuning to an assigned frequency channel may be accomplished by filling the line to a specified pressure with a gas of relatively high dielectric constant.

Inventors

  • 👤 Chester B Watts Jr

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-09 05:45
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/22; H01Q13/00; H01Q13/20; H01Q13/203

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 113 words
A slotted cable antenna comprising a coaxial transmission line, connector means at one end of said line for joining to a source of r.f. energy, a plurality of gaps in the outer conductor of said line, radiation control means disposed across each of said gaps, said control means presenting in each case an impedance, whereby most of the line current is conveyed across the gap, except for a portion of said current which escapes to flow on the outside of said line, thereby producing radiation, and further, where the spacing of said gaps varies from end to end of said line, producing thereby a predetermined and nonlinear phase distribution of the radiation current.
Claim 2
Dependent Claim 113 words
A slotted cable antenna comprising a coaxial transmission line, connector means at one end of said line for joining to a source of r.f. energy, a plurality of gaps in the outer conductor of said line, radiation control means disposed across each of said gaps, said control means presenting in each case an impedance, whereby most of the line current is conveyed across the gap, except for a portion of said current which escapes to flow on the outside of said line, thereby producing radiation, and further, where the spacing of said gaps varies from end to end of said line, producing thereby a predetermined and nonlinear phase distribution of the radiation current.
Claim 3
Dependent Claim 18 words
An antenna as in claim 1, with a resistive load connected to the second end of said line.
Claim 4
Dependent Claim 23 words
An antenna as in claim 1 with said radiation control means comprising a metal tube, surrounding each of said gaps, but insulated therefrom.
Claim 5
Dependent Claim 29 words
An antenna as in claim 1, with frequency tuning means comprising a quantity of high-dielectric gas filling the space between inner and outer conductors of said coaxial transmission line.
Claim 6
Dependent Claim 32 words
An antenna as in claim 1, where the impedance presented by said control means varies from end to end of said line, producing thereby a predetermined amplitude distribution of the radiation current.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-10-17 1976-04-17 1976-10-17 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-10-17 1980-04-17 1980-10-17 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-10-17 1984-04-17 1984-10-17 $7700.00 Window Closed / Lapsed

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