Slotted cable localizer antenna

Details Slotted cable localizer antenna Slotted cable localizer antenna

1999-01-20

2002-02-05

Wimer, Michael C. (Department: 2821)

Communications: radio wave antennas

Antennas

Slot type

C343S771000

Reexamination Certificate

active

06344831

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
“Not applicable”
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
“Not applicable”
REFERENCE TO A MICROFICHE APPENDIX
“Not applicable”
BACKGROUND OF THE INVENTION
This invention relates to improvements in slotted cable runway localizer antennas for the Instrument Landing System (ILS). It combines features of two earlier U.S. Pat. No. 3,577,197, May 4, 1971, Watts, Jr., “Slotted Cable Localizer Antenna,” (Ref.1), and U.S. Pat. No. 4,464,665, Aug. 7, 1984, Watts, Jr., “Slotted Cable Antenna Structure,” (Ref.2), to provide superior performance. An embodiment of this invention is described in a published paper: Watts, Jr. and Johnson, J., “Slotted Cable ILS Localizer,” Proceedings of the 10th International Flight Inspection Symposium, Seattle, Wash., June, 1998, (Ref.3).
BRIEF SUMMARY OF THE INVENTION
This antenna radiates simultaneous sum and difference patterns carrying standard ILS reference (CSB) and deflection (SBO) components of the transmitted signal. The signal components from an ILS transmitter are supplied through an rf bridge (hybrid) to both ends of the slotted cable structure. Optional isolators inserted in the coaxial feed lines improve the impedance presented to the transmitter.
An object of the invention is to provide a slotted cable localizer antenna having improved efficiency and ease of construction. This is accomplished through a particular arrangement of parts, many of which are common copper plumbing fittings, together with other special parts to be described.


REFERENCES:
patent: 3577197 (1971-05-01), Watts
patent: 4464665 (1984-08-01), Watts

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