Patent US4983988A successfully refreshed from Google Patents.
US4983988A
Expired / Lapsed
US
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Antenna with enhanced gain
Assignee: Raytheon Co
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Filing: 1988-11-21
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Granted: 1991-01-08
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Expires: 2008-11-21
Abstract
Abstract The present invention will yield enhanced gain over a conventional antenna system by taking advantage of combining directional antennae. In one embodiment, the invention utilizes four 10 dB dipole, vertically-polarized, omni-directional antennae having a reflector added to each one to limit the horizontal beamwidth to 90° and increase the gain to 16 dB. The vertical beamwidth remains at 7°. By utilizing four of these antennae and utilizing power combining hybrids to connect each of the two opposed antennae together, excess gain over a 10 dB omni-directional system will be obtained. The effective antenna gain is equal to the directional antenna gain minus the omni-directional antenna gain minus the hybrid loss. Thus, the vertical beamwidth and physical height of the antenna are preserved with the increase in gain at the cost of a little antenna complexity.
Inventors
- 👤 Ernest A. Franke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:06
CPC Classifications
H; H01; H01Q; H01Q19/00; H01Q19/10; H01Q19/108
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
An antenna system having enhanced gain comprising: at least N directional antenna combining to cover a 360° horizontal beamwidth sector and having an established vertical beamwidth, each individual antenna including an omni-directional antenna and a reflector element to limit the horizontal beamwidth of the associated omni-directional antenna to cover no more than a 360°/N beamwidth sector where N=an even number ≧2; a power combiner hybrid coupled to each opposed pair of antennae for combining the signals from the opposed antennae; and a single channel diversity receiver coupled to the power combiner hybrids for adjusting the phase and amplitude of the signal from each combiner hybrid for constructively combining the signals.
Claim 2
Dependent Claim
110 words
An antenna system having enhanced gain comprising: at least N directional antenna combining to cover a 360° horizontal beamwidth sector and having an established vertical beamwidth, each individual antenna including an omni-directional antenna and a reflector element to limit the horizontal beamwidth of the associated omni-directional antenna to cover no more than a 360°/N beamwidth sector where N=an even number ≧2; a power combiner hybrid coupled to each opposed pair of antennae for combining the signals from the opposed antennae; and a single channel diversity receiver coupled to the power combiner hybrids for adjusting the phase and amplitude of the signal from each combiner hybrid for constructively combining the signals.
Claim 3
Dependent Claim
7 words
A system in claim 1 wherein N=4.
Claim 4
Dependent Claim
7 words
A system in claim 1 wherein N=6.
Claim 5
Dependent Claim
27 words
A system as in claim 1 wherein each reflector limits the horizontal beamwidth of its associated antenna to no more than 90° without disturbing the vertical beamwidth.
Claim 6
Dependent Claim
132 words
An antenna system having enhanced gain comprising: at least N directional antennae combining to cover a 360° horizontal beamwidth and having an established vertical beamwidth, each individual antenna including an omni-directional antenna and a reflector element to limit the horizontal beamwidth of the associated omni-directional antenna to cover no more than a 360°/N beamwidth sector where N=an even number ≧2; a power combiner hybrid coupled to each opposed pair of antennae for combining the signals from the opposed antennae; a power splitter coupled to the output of each combiner hybrid and producing at least n output signals where n=the number of frequencies to be received; n single channel diversity receivers individually coupled to one of said at least n output signals from each power splitter to accommodate one of the n frequencies.
Claim 7
Dependent Claim
132 words
An antenna system having enhanced gain comprising: at least N directional antennae combining to cover a 360° horizontal beamwidth and having an established vertical beamwidth, each individual antenna including an omni-directional antenna and a reflector element to limit the horizontal beamwidth of the associated omni-directional antenna to cover no more than a 360°/N beamwidth sector where N=an even number ≧2; a power combiner hybrid coupled to each opposed pair of antennae for combining the signals from the opposed antennae; a power splitter coupled to the output of each combiner hybrid and producing at least n output signals where n=the number of frequencies to be received; n single channel diversity receivers individually coupled to one of said at least n output signals from each power splitter to accommodate one of the n frequencies.
Claim 8
Dependent Claim
8 words
A system as in claim 5 wherein n=2.
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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) | 1994-01-07 | 1994-07-09 | 1995-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-07 | 1998-07-09 | 1999-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-07 | 2002-07-09 | 2003-01-08 | $7700.00 | Window Closed / Lapsed |