Patent US5568162A successfully refreshed from Google Patents.
US5568162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
GPS navigation and differential-correction beacon antenna combination
Assignee: Trimble Inc
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Filing: 1994-08-08
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Granted: 1996-10-22
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Expires: 2014-08-08
Abstract
Abstract An antenna system comprises a stack of elements that include a GPS patch antenna on a groundplane with an associated low-noise amplifier (LNA), a first Faraday shield of flat ribbon cable covering a first ferrite rod magnetic field antenna, a second ferrite rod magnetic field antenna separated from and orthogonal to the first ferrite rod magnetic field antenna, a second Faraday shield of flat ribbon cable covering the second ferrite rod magnetic field antenna and having a LNA for each of the ferrite rod magnetic field antennas. A third Faraday shield is positioned between the first and second ferrite rod magnetic field antennas. All the Faraday shields are connected to ground such that there are no loops that may act as shorted turns to avoid desensitizing the ferrite rod magnetic field antennas.
Inventors
- 👤 Robert A. Samsel
- 👤 Brian G. Westfall
- 👤 Stephen K. Will
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:08
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/52; H01Q1/526; H01Q21/00; H01Q21/28; H01Q7/00; H01Q7/04; H01Q9/00; H01Q9/04; H01Q9/0407
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
184 words
An antenna system, comprising: a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver; magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information; a radome providing for the enclosure and protection from weather and mechanical injury of the microwave receiver antenna and the magnetic loop antenna means disposed within, wherein the radome is comprised of material transparent to microwave radio signals and the relative placement of the microwave receiver antenna and the magnetic loop antenna means within the radome provides for a view of the sky by the microwave receiver antenna that is unobstructed by the magnetic loop antenna means; and radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors.
Claim 2
Dependent Claim
184 words
An antenna system, comprising: a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver; magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information; a radome providing for the enclosure and protection from weather and mechanical injury of the microwave receiver antenna and the magnetic loop antenna means disposed within, wherein the radome is comprised of material transparent to microwave radio signals and the relative placement of the microwave receiver antenna and the magnetic loop antenna means within the radome provides for a view of the sky by the microwave receiver antenna that is unobstructed by the magnetic loop antenna means; and radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors.
Claim 3
Dependent Claim
160 words
An antenna system, comprising: a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver; magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information; and radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors; wherein, the microwave receiver antenna is oriented in an enclosure for upward vertical hemispherical radio signal reception; and wherein, the magnetic loop antenna means comprises a pair of ferrite rods mounted at right angles to one another and mounted beneath the microwave receiver antenna in said enclosure for horizontal omni-directional radio signal reception.
Claim 4
Dependent Claim
160 words
An antenna system, comprising: a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver; magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information; and radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors; wherein, the microwave receiver antenna is oriented in an enclosure for upward vertical hemispherical radio signal reception; and wherein, the magnetic loop antenna means comprises a pair of ferrite rods mounted at right angles to one another and mounted beneath the microwave receiver antenna in said enclosure for horizontal omni-directional radio signal reception.
Claim 5
Dependent Claim
163 words
An antenna system, comprising: a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver; magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information; and radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors; wherein, the magnetic loop antenna means comprises two ferrite rods set at right angles to one another; and wherein, the radio electrostatic field shielding means comprises a plurality of conductors in a fan arrangement each positioned above, below and between said ferrite rods and spaced away from the magnetic loop antenna means to reduce antenna desensitization.
Claim 6
Dependent Claim
163 words
An antenna system, comprising: a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver; magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information; and radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors; wherein, the magnetic loop antenna means comprises two ferrite rods set at right angles to one another; and wherein, the radio electrostatic field shielding means comprises a plurality of conductors in a fan arrangement each positioned above, below and between said ferrite rods and spaced away from the magnetic loop antenna means to reduce antenna desensitization.
Claim 7
Dependent Claim
25 words
The antenna system of claim 3, wherein: the radio electrostatic field shielding means comprises a flat ribbon conductor wrapped around the magnetic loop antenna means.
Claim 8
Dependent Claim
46 words
The antenna system of claim 3, wherein: the radio electrostatic field shielding means comprises a flat ribbon conductor wrapped around the circumference of each of said ferrite rods with a spacing to reduce antenna desensitization and folded over an end of each of said ferrite rods.
Claim 9
Dependent Claim
201 words
An antenna system, comprising: a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver; magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information; and radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors; wherein, the magnetic loop antenna means comprises two ferrite rods set at right angles to one another with a set of three plates with one each plate positioned above, between and below said ferrite rods; and wherein, the radio electrostatic field shielding means comprises a flat ribbon conductor laid flat against each of said plates and spaced away from the magnetic loop antenna means to reduce antenna desensitization and having ends of said flat ribbon conductor folded over an end of each of said ferrite rods to embrace at least two of said plates.
Claim 10
Dependent Claim
201 words
An antenna system, comprising: a microwave receiver antenna for receiving microwave radio transmissions from orbiting global positioning system (GPS) satellites and for connection to a GPS navigation receiver; magnetic loop antenna means for connection to said GPS navigation receiver, and proximate to the microwave receiver antenna, and for receiving radio beacon transmissions that include differential correction information; and radio electrostatic field shielding means comprising a plurality of similarly-oriented conductors that surround the magnetic loop antenna means where each of said conductors is open-ended and has a single connection to ground, wherein parasitic currents that would otherwise desensitize the magnetic loop antenna are prevented by open-ending said conductors; wherein, the magnetic loop antenna means comprises two ferrite rods set at right angles to one another with a set of three plates with one each plate positioned above, between and below said ferrite rods; and wherein, the radio electrostatic field shielding means comprises a flat ribbon conductor laid flat against each of said plates and spaced away from the magnetic loop antenna means to reduce antenna desensitization and having ends of said flat ribbon conductor folded over an end of each of said ferrite rods to embrace at least two of said plates.
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) | 1999-10-22 | 2000-04-22 | 2000-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-22 | 2004-04-22 | 2004-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-22 | 2008-04-22 | 2008-10-22 | $7700.00 | Window Closed / Lapsed |