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Patent US4062019A successfully refreshed from Google Patents.
US4062019A
Expired / Lapsed
US
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Low cost linear/circularly polarized antenna
Assignee: SPX Technologies Inc
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Filing: 1976-04-02
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Granted: 1977-12-06
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Expires: 1996-04-02
Abstract
Abstract A linear/circularly polarized antenna system is provided by four conductive elements. The conductive elements are joined in pairs at their ends with the joined ends spaced by a conductive support member from a flat reflector. The lengths of the conductive elements of each dipole element are changed from being equal lengths of approximately a quarter operating frequency wavelength to one slightly longer and the other slightly less than a quarter wavelength to selectively change operation from that of a linearly polarized antenna to that of a circularly polarized antenna.
Inventors
- 👤 Oakley McDonald Woodward
- 👤 Matti Solmu Olavi Siukola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:45
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/06; H01Q21/20; H01Q21/205; H01Q21/24; H01Q21/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
239 words
An antenna system operating over a given band of frequencies comprising: a flat reflective panel, support means including a pair of separated support members extending generally orthogonal to said panel, a first pair of generally orthogonally oriented conductive elements joined together at one end to one of said support members a distance of about one-quarter wavelength at a given frequency within said given band of frequencies from said panel, at least one of said elements being at least about one-quarter wavelength long at said given frequency, a second pair of generally orthogonally oriented conductive elements joined together at one end to the other of said support members about said distance from said panel, at least one of said elements being at least about one-quarter wavelength long at said given frequency, each one of said pair of elements in said first pair extending in generally an opposite direction from one of the conductive elements in said second pair of elements, each of said conductive elements being inclined toward said reflective panel with each of said conductive elements having a conductive loading rod connected across the free end thereof, and a coaxial transmission line feed having an outer conductor coupled to one of said pair of orthogonally oriented elements and a center conductor coupled to the other of said pair of orthogonally oriented conductive elements at a point located approximately where said conductive elements are joined together to said support members.
Claim 2
Dependent Claim
239 words
An antenna system operating over a given band of frequencies comprising: a flat reflective panel, support means including a pair of separated support members extending generally orthogonal to said panel, a first pair of generally orthogonally oriented conductive elements joined together at one end to one of said support members a distance of about one-quarter wavelength at a given frequency within said given band of frequencies from said panel, at least one of said elements being at least about one-quarter wavelength long at said given frequency, a second pair of generally orthogonally oriented conductive elements joined together at one end to the other of said support members about said distance from said panel, at least one of said elements being at least about one-quarter wavelength long at said given frequency, each one of said pair of elements in said first pair extending in generally an opposite direction from one of the conductive elements in said second pair of elements, each of said conductive elements being inclined toward said reflective panel with each of said conductive elements having a conductive loading rod connected across the free end thereof, and a coaxial transmission line feed having an outer conductor coupled to one of said pair of orthogonally oriented elements and a center conductor coupled to the other of said pair of orthogonally oriented conductive elements at a point located approximately where said conductive elements are joined together to said support members.
Claim 3
Dependent Claim
22 words
The combination of claim 1 wherein said conductive elements are inclined toward said reflective panel at an angle of 45° ± 5°.
Claim 4
Dependent Claim
66 words
The combination of claim 2 wherein one of said conductive elements of each of said pair of elements is slightly longer than the other so that one of said elements behaves as an element greater than a one-quarter wavelength at a frequency within said band and said other of said conductive elements behaves as an element less than one-quarter wavelength at a frequency within said band.
Claim 5
Dependent Claim
40 words
The combination of claim 3 wherein said one conductive element is one fortieth of a wavelength longer than and said other conductive element is one fortieth of a wavelength shorter than a quarter wavelength at a frequency within said band.
Claim 6
Dependent Claim
16 words
The combination of claim 4 wherein said conductive rods are arranged parallel to said reflective panel.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |