US3879735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband antenna systems with isolated independent radiators
Assignee: United States Department of the Army
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Filing: 1974-05-22
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Granted: 1975-04-22
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Expires: 1994-05-22
Abstract
Abstract A DIPOLE ARRAY CONSISTING OF AT LEAST TWO DIPOLE ANTENNAS MOUNTED ONE ABOVE THE OTHER IN A GENERALLY VERTICAL PLANE, HAVING RESPECTIVE PAIRS OF RADIATING ELEMENTS SUBSTANTIALLY ALIGNED ON A COMMON GENERALLY VERTICAL AXIS AND BEING FED FROM RESPECTIVE RADIO SIGNAL SOURCES BY THE RESPECTIVE FEED LINES DIRECTED ALONG THE COMMON VERTICAL AXIS THROUGH THE VARIOUS RADIATING ELEMENTS AND BEING CONFIGURED TO ALSO INCLUDE A CABLE CHOKE SECTION ON EITHER SIDE OF THE LOWER ANTENNA AS WELL AS A CABLE CHOKE SECTION BELOW THE UPPER ANTENNA. AN ISOLATOR SECTION COMPRISED OF A PLURALITY OF SERIES CONNECTED CABLE CHOKE SECTIONS ARE LOCATED INTERMEDIATE EACH DIPOLE ANTENNA. ADDITIONALLY, AN IMPEDANCE CHARACTERISTIC COMPENSATING NETWORK CONSISTING OF A PREDETERMINED LENGTH OF TRANSMISSION LINE IS CONNECTED TO EACH DIPOLE FEED LINE WITHIN ONE OF THE RADIATING ELEMENTS OF EACH DIPOLE ANTENNA.
Inventors
- 👤 Donn V Campbell
- 👤 James Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:22
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/28; H01Q9/00; H01Q9/04; H01Q9/16; H01Q9/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
246 words
A broadband antenna system for at least first and second radio apparatus adapted to operate simultaneously in relative close proximity, comprising in combination: at least two dipole antennas, each including a pair of radiating elements, respectively coupled to said first and second radio apparatus, said antennas being mounted one above the other and having a predetermined spacing therebetween with said respective pairs of radiating elements being aligned generally along a common vertical axis; a first transmission feedline coupling said first radio apparatus to the upper dipole antenna, running through the pair of radiating elements of said lower dipole antenna and the lower radiating element of said upper dipole antenna and additionally being configured to provide a first cable choke section adjacently below the lower radiating element of the upper dipole antenna, a second cable choke section adjacently above the upper radiating element of the lower dipole antenna, and a third cable choke section adjacently below the lower radiating element of the lower dipole antenna; a second transmission feedline coupling said second radio apparatus to the lower dipole antenna, being fed through the lower radiating element thereof, and configured to provide a fourth cable choke section adjacently below the lower radiating element of said lower dipole antenna; and impedance matching networks located inside of one element of each of said two dipole antennas, being respectively coupled to said first and second transmission feedlines for adjusting the impedance characteristic of the feed point of said two dipole antennas.
Claim 2
Dependent Claim
246 words
A broadband antenna system for at least first and second radio apparatus adapted to operate simultaneously in relative close proximity, comprising in combination: at least two dipole antennas, each including a pair of radiating elements, respectively coupled to said first and second radio apparatus, said antennas being mounted one above the other and having a predetermined spacing therebetween with said respective pairs of radiating elements being aligned generally along a common vertical axis; a first transmission feedline coupling said first radio apparatus to the upper dipole antenna, running through the pair of radiating elements of said lower dipole antenna and the lower radiating element of said upper dipole antenna and additionally being configured to provide a first cable choke section adjacently below the lower radiating element of the upper dipole antenna, a second cable choke section adjacently above the upper radiating element of the lower dipole antenna, and a third cable choke section adjacently below the lower radiating element of the lower dipole antenna; a second transmission feedline coupling said second radio apparatus to the lower dipole antenna, being fed through the lower radiating element thereof, and configured to provide a fourth cable choke section adjacently below the lower radiating element of said lower dipole antenna; and impedance matching networks located inside of one element of each of said two dipole antennas, being respectively coupled to said first and second transmission feedlines for adjusting the impedance characteristic of the feed point of said two dipole antennas.
Claim 3
Dependent Claim
38 words
The antenna system as defined by claim 1 wherein said first transmission feedline is additionally configured to include an isolation section comprised of the plurality of cable choke sections located intermediate said first and second cable choke section.
Claim 4
Dependent Claim
26 words
The antenna system as defined by claim 1 wherein said third and fourth cable choke sections are configured contiguously to provide a composite cable choke section.
Claim 5
Dependent Claim
38 words
The antenna system as defined by claim 3 wherein said first transmission line is configured to additionally provide an isolator section comprising a plurality of selectively configured cable choke sections intermediate said first and second cable choke section.
Claim 6
Dependent Claim
27 words
The antenna system as defined by claim 4 wherein each pair of radiating elements is comprised of radiating elements having a relatively large length to width ratio.
Claim 7
Dependent Claim
152 words
The antenna system as defined by claim 1 wherein said first and second transmission feedlines are each comprised of coaxial transmission lines having inner and outer conductors, the inner conductor of said first transmission line being electrically connected to the lower portion of the upper radiating element of the upper dipole antenna and the outer conductor thereof being electrically connected to the upper and lower portion of the lower radiating element of said upper dipole antenna, as well as the upper portion of the upper radiating element and the lower portion of the lower radiating element of the lower dipole antenna; and wherein said inner conductor of said second transmission line is electrically connected to the lower portion of the upper radiating element of the lower dipole antenna and the outer conductor thereof is electrically connected to the upper and lower portion of the lower radiating element of said lower dipole antenna.
Claim 8
Dependent Claim
44 words
The antenna system as defined by claim 6 wherein said compensating networks for said two dipole antennas coMprises transmission line means located inside the lower radiating element of said two dipole antennas and being coupled to the respective first and second transmission line therein.
Claim 9
Dependent Claim
38 words
The antenna system as defined by claim 7 wherein said compensating means comprises a stub of coaxial transmission line having an inner and outer conductor respectively connected to the inner and outer conductor of the respective transmission line.
Claim 10
Dependent Claim
36 words
The antenna system as defined by claim 1 wherein said first, second, third and fourth cable choke sections are comprised of a predetermined number of windings of said transmission lines wound on a respective magnetic core.
Claim 11
Dependent Claim
16 words
The antenna system as defined by claim 9 wherein said cores comprise toroids of ferrite material.
Claim 12
Dependent Claim
25 words
The antenna system as defined by claim 1 wherein said first and second radio apparatus comprise transceivers operable in the megahertz range of radio frequencies.
References Cited (Backward Citations)
US3680146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |