US3899787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triplex antenna
Assignee: United States Department of the Army
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Filing: 1974-07-18
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Granted: 1975-08-12
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Expires: 1994-07-18
Abstract
Abstract An antenna system for operation in the UHF and VHF band comprising at least three individually excited tubular dipole antennas vertically oriented in an in-line configuration inside of a tubular radome and being spaced approximately one wavelength apart. Each tubular radiation element is excited by means of a Gamma Match feed (DC grounded) for protection against lightning and destructive effects from high level electromagnetic pulses. A coaxial sleeve approximately a quarter wavelength long is additionally mounted exteriorly of and is associated with each tubular radiating element inside of the radome for broadbanding the feed-point impedance of the respective dipole antennas.
Inventors
- 👤 Watson P Czerwinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
H; H01; H01Q; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/18; H01Q21/00; H01Q21/30
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
195 words
A broadband antenna system for a plurality of radio apparatus adapted to operate simultaneously in the same frequency band, comprising in combination: a generally vertically oriented electrically conductive and grounded support conduit of predetermined length; a respective plurality of in-line tubular dipole radiating elements, one for each of said plural radio apparatus, axially mounted on said support conduit, the inner surface of said tubular radiating elements being grounded to said conduit substantially mid-way along their respective lengths; a port in the sidewall of said support conduit at the location of each of said radiating element; a respective coaxial cable, having an inner and outer conductor, coupling each radiating element to a respective radio apparatus of said plurality of radio apparatus, running through support conduit and out of a respective port, said outer conductor being electrically grounded in the vicinity of said port; each said tubular radiating element having an opening to the outer wall surface thereof wherein the inner conductor of the respective coaxial cable passes therethrough and is electrically connected to said outer surface; and respective impedance broadbanding means for each of said dipole radiating elements disposed exteriorally of each of said radiating elements.
Claim 2
Dependent Claim
195 words
A broadband antenna system for a plurality of radio apparatus adapted to operate simultaneously in the same frequency band, comprising in combination: a generally vertically oriented electrically conductive and grounded support conduit of predetermined length; a respective plurality of in-line tubular dipole radiating elements, one for each of said plural radio apparatus, axially mounted on said support conduit, the inner surface of said tubular radiating elements being grounded to said conduit substantially mid-way along their respective lengths; a port in the sidewall of said support conduit at the location of each of said radiating element; a respective coaxial cable, having an inner and outer conductor, coupling each radiating element to a respective radio apparatus of said plurality of radio apparatus, running through support conduit and out of a respective port, said outer conductor being electrically grounded in the vicinity of said port; each said tubular radiating element having an opening to the outer wall surface thereof wherein the inner conductor of the respective coaxial cable passes therethrough and is electrically connected to said outer surface; and respective impedance broadbanding means for each of said dipole radiating elements disposed exteriorally of each of said radiating elements.
Claim 3
Dependent Claim
38 words
The antenna system as defined by claim 1 wherein each said respective broadbanding means comprises quarter wavelength tubular elements coaxially disposed outside of the respective tubular radiating element and positioned intermediate the length of said tubular radiating element.
Claim 4
Dependent Claim
27 words
The antenna system as defined by claim 2 wherein said coaxiAl tubular broadbanding element is disposed substantially mid-way along the length of the respective tubular radiating element.
Claim 5
Dependent Claim
54 words
The antenna system as defined by claim 3 and additionally including a tubular radome coaxially oriented with respect to said plurality of tubular radiating elements and their respective tubular broadbanding elements, said radome having an inner surface which is adapted to hold the broadbanding tubular elements in position relative to the respective radiating elements.
Claim 6
Dependent Claim
47 words
The antenna system as defined by claim 4 wherein said support conduit comprises a tubular member of a relatively small cross sectional dimension with respect to said tubular radiating elements and having the outer surface coated with lossy material for providing electrical isolation between adjacent radiating elements.
Claim 7
Dependent Claim
43 words
The antenna system as defined by claim 5 and additionally including at least one ring of lossy material disposed on the outer surface of said tubular member located intermediate said plurality of radiating elements for providing additional electrical isolation between adjacent radiating elements.
Claim 8
Dependent Claim
51 words
The antenna system as defined by claim 1 wherein said opening in each said tubular member is located approximately 0.05 wavelength of a predetermined operating frequency distance away from the point along the length of said radiating element wherein the inner surface of said element is grounded to said support conduit.
Claim 9
Dependent Claim
48 words
The antenna system as defined by claim 1 and additionally including respective electrically conductive support and grounding means attaching each tubular radiating element to said support conduit, said means being disposed normal to the common central axis of said support conduit and said plurality of tubular radiating elements.
Claim 10
Dependent Claim
25 words
The antenna system as defined by claim 8 wherein the outer conductor of each coaxial cable is electrically connected to said support and grounding means.
Claim 11
Dependent Claim
43 words
The antenna system as defined by claim 1 and additionally including means located at the upper end of said support conduit for mounting at least one hazard light thereon, and electrical conductor means for operating said hazard light running through said support conduit.
Claim 12
Dependent Claim
36 words
The antenna system as defined by claim 1 wherein said plurality of radiating elements comprises at least three substantially identical tubular radiating elements having a mutual separation of approximately one wavelength of a predetermined operating frequency.
Claim 13
Dependent Claim
67 words
The antenna system as defined by claim 1 and additionally including a mounting sleeve and a first base plate attached to the lower portion thereof, said plate including a respective plurality of coaxial cable connectors mounted thereon and being respectively connected to each coaxial cable, a second base plate attached to the upper portion of said sleeve, said support conduit being mounted on said second base plate.
Claim 14
Dependent Claim
19 words
The antenna system as defined by claim 12 and additionally including a tubular radome fitted to said mounting sleeve.
Claim 15
Dependent Claim
45 words
The antenna system as defined by claim 13 wherein said impedance broadbanding means comprises quarter wavelength tubular sections, and wherein said support member, said plurality of tubular radiating elements and respective tubular broadbanding elements as well as said tubular radome are circular in cross section.
References Cited (Backward Citations)
US2199375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |