US3732572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Log periodic antenna with foreshortened dipoles
Assignee: GTE Sylvania Inc
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Filing: 1971-11-22
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Granted: 1973-05-08
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Expires: 1991-11-22
Abstract
Abstract A log periodic antenna comprising foreshortened dipoles, each having a profile corresponding to the interior cross section of a hollow ridged waveguide. One or more of the elements of the array, usually those which are resonant at relatively low frequencies (HF and low VHF bands) are so foreshortened and each is formed with conductive wire for an open-type element or conductive sheet or film for a solid type dipole. The dipole has the profile of the interior cross section of either a double ridged or a single ridged waveguide and is oriented with the plane of the dipole either parallel to or transversely of the plane containing the axis of the array. A coplanar array of log periodic dipole arrays consisting of such foreshortened dipoles exhibits substantially improved gain and radiation pattern characteristics as compared to a coplanar array of conventional log periodic dipole arrays.
Inventors
- 👤 Shu Kuo S Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:17
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/20; H01Q13/206; H01Q11/00; H01Q11/02; H01Q11/10; H01Q11/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A log periodic dipole antenna having an axis and comprising a pair of axially extending feed lines, a plurality of axially spaced dipoles connected to said feed lines and extending in directions transversely of said axis, at least three of said dipoles having lengths substantially less than lambda /2 where lambda is the wavelength at the resonant frequency of the respective dipole, each of said three dipoles having two identical elements on opposite sides of said axis, each of said elements having a stem connected to one of said feed lines and a rectangular body longitudinally connected to the end of said stem opposite from said one of said feed lines.
Claim 2
Dependent Claim
111 words
A log periodic dipole antenna having an axis and comprising a pair of axially extending feed lines, a plurality of axially spaced dipoles connected to said feed lines and extending in directions transversely of said axis, at least three of said dipoles having lengths substantially less than lambda /2 where lambda is the wavelength at the resonant frequency of the respective dipole, each of said three dipoles having two identical elements on opposite sides of said axis, each of said elements having a stem connected to one of said feed lines and a rectangular body longitudinally connected to the end of said stem opposite from said one of said feed lines.
Claim 3
Dependent Claim
34 words
The antenna according to claim 1 comprising a mixed array of said last named dipoles at the low frequency end and a plurality of linear dipoles at the high frequency end of the antenna.
Claim 4
Dependent Claim
24 words
The antenna according to claim 1 in which the plane of said body is parallel to the plane containing said axis of the antenna.
Claim 5
Dependent Claim
24 words
The antenna according to claim 1 in which the plane of said body extends transversely of the plane containing said axis of the antenna.
Claim 6
Dependent Claim
39 words
The antenna according to claim 1 in which the dimension of the body of said one element transverse to said axis is approximately equal to the length of said stem between connections to the feed line and the body.
Claim 7
Dependent Claim
204 words
A dual array antenna comprising first and second arrays having axes diverging at a predetermined angle and defining the plane of the antenna, each of said arrays comprising a pair of feed lines extending along the axis of the array, a plurality of axially spaced dipoles connected to said feed lines and extending transversely of said axis, the lengths and axial spacings of said dipoles increasing in one direction along said axis in progressive increments of a predetermined ratio definitive of a log periodic structure, at least three of said dipoles having lengths substantially less Than lambda /2 where lambda is the wavelength at the resonant frequency of the respective dipole, each of said three dipoles having two identical elements on opposite sides of said axis, each of said elements having a stem connected to one of said feed lines and a rectangular body longitudinally connected to the end of said stem opposite from said one of said feed lines, the dipoles of said first and second arrays lying in planes parallel to said plane of the antenna with the dipoles of one array spaced from adjacent dipoles of the other array by an increasing distance in the direction of divergence of said axes.
Claim 8
Dependent Claim
204 words
A dual array antenna comprising first and second arrays having axes diverging at a predetermined angle and defining the plane of the antenna, each of said arrays comprising a pair of feed lines extending along the axis of the array, a plurality of axially spaced dipoles connected to said feed lines and extending transversely of said axis, the lengths and axial spacings of said dipoles increasing in one direction along said axis in progressive increments of a predetermined ratio definitive of a log periodic structure, at least three of said dipoles having lengths substantially less Than lambda /2 where lambda is the wavelength at the resonant frequency of the respective dipole, each of said three dipoles having two identical elements on opposite sides of said axis, each of said elements having a stem connected to one of said feed lines and a rectangular body longitudinally connected to the end of said stem opposite from said one of said feed lines, the dipoles of said first and second arrays lying in planes parallel to said plane of the antenna with the dipoles of one array spaced from adjacent dipoles of the other array by an increasing distance in the direction of divergence of said axes.
Claim 9
Dependent Claim
112 words
A multielement dipole array having an axis and comprising a pair of axially extending feed lines, a plurality of axially spaced dipoles connected to said feed lines and extending in directions transversely of said axis, at least three of said dipoles having lengths substantially less than lambda /2 where lambda is the wavelength at the resonant frequency of the respective dipole, each of said three dipoles having two identical elements on opposite sides of said axis, each of said elements having a stem connected to one of said feed lines and a rectangular body longitudinally and colinearly connected to the end of said stem opposite from said one of said feed lines.
Claim 10
Dependent Claim
112 words
A multielement dipole array having an axis and comprising a pair of axially extending feed lines, a plurality of axially spaced dipoles connected to said feed lines and extending in directions transversely of said axis, at least three of said dipoles having lengths substantially less than lambda /2 where lambda is the wavelength at the resonant frequency of the respective dipole, each of said three dipoles having two identical elements on opposite sides of said axis, each of said elements having a stem connected to one of said feed lines and a rectangular body longitudinally and colinearly connected to the end of said stem opposite from said one of said feed lines.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |