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US6043786A
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Multi-band slot antenna structure and method
Assignee: Google Technology Holdings LLC
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Filing: 1997-05-09
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Granted: 2000-03-28
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Expires: 2017-05-09
Abstract
Abstract The multi-band slot antenna structure and method uses a single antenna to cover at least two distinct reception frequency bands using only one excitation port. In a first type of configuration, dual resonant slots (320, 325) are placed in close proximity and driven using a single differential excitation port having a positive node (370) and a negative node (375). In a second type of configuration, a half wavelength conductor (560, 660, 760) is layered over a quarter wavelength slot (520, 720) or half wavelength slot (620), and when the conductor is heavily magnetically coupled to the slot, a virtual electric short is achieved across the slot. In a third type of configuration, a quarter wavelength conductor (1060, 1160) is layered over a quarter wavelength slot (1020) or half wavelength slot (1120), and the conductor is used to capacitively or inductively load the slot (1120) at frequencies other than the natural resonant frequency of the slot (1120).
Inventors
- 👤 Louis Jay Vannatta
- 👤 Hugh Kennedy Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:34
CPC Classifications
H; H01; H01Q; H01Q13/00; H01Q13/10; H01Q1/00; H01Q1/36; H01Q1/38; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/342; H01Q5/357; H01Q5/378
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
147 words
A multi-band slot antenna resonant at both a first frequency and at a second frequency comprising: a first slot, that is a quarter wavelength at the first frequency, having an open end and a closed end, implemented in a conductive ground plane; a second slot, that is a quarter wavelength at the second frequency, having an open end and a closed end, implemented in the conductive ground plane; a strip of the conductive ground plane common to the first slot and the second slot; a positive node of a differential excitation port coupled to the conductive ground plane proximate to the first slot at a proportional distance from the closed end of the first slot; and a negative node of the differential excitation port coupled to the conductive ground plane proximate to the second slot at the proportional distance from the closed end of the second slot.
Claim 2
Dependent Claim
147 words
A multi-band slot antenna resonant at both a first frequency and at a second frequency comprising: a first slot, that is a quarter wavelength at the first frequency, having an open end and a closed end, implemented in a conductive ground plane; a second slot, that is a quarter wavelength at the second frequency, having an open end and a closed end, implemented in the conductive ground plane; a strip of the conductive ground plane common to the first slot and the second slot; a positive node of a differential excitation port coupled to the conductive ground plane proximate to the first slot at a proportional distance from the closed end of the first slot; and a negative node of the differential excitation port coupled to the conductive ground plane proximate to the second slot at the proportional distance from the closed end of the second slot.
Claim 3
Dependent Claim
26 words
A multi-band slot antenna according to claim 1, wherein the open end of the first slot and the open end of the second slot are aligned.
Claim 4
Dependent Claim
26 words
A multi-band slot antenna according to claim 1, wherein the closed end of the first slot and the closed end of the second slot are aligned.
Claim 5
Dependent Claim
93 words
A multi-band slot antenna resonant and radiant at both a first frequency and at a second frequency comprising: a slot implemented in a conductive ground plane that is resonant and radiant at the first frequency; and a conductor that is resonant but not appreciably radiant at the second frequency, different than the first frequency, and highly electromagnetically coupled to the first slot at the second frequency while negligibly electromagnetically coupled to the first slot at frequencies other than the second frequency, such that the slot is resonant and radiant at the second frequency.
Claim 6
Dependent Claim
93 words
A multi-band slot antenna resonant and radiant at both a first frequency and at a second frequency comprising: a slot implemented in a conductive ground plane that is resonant and radiant at the first frequency; and a conductor that is resonant but not appreciably radiant at the second frequency, different than the first frequency, and highly electromagnetically coupled to the first slot at the second frequency while negligibly electromagnetically coupled to the first slot at frequencies other than the second frequency, such that the slot is resonant and radiant at the second frequency.
Claim 7
Dependent Claim
17 words
A multi-band slot antenna according to claim 4, wherein the conductor is embedded in a dielectric material.
Claim 8
Dependent Claim
25 words
A multi-band slot antenna according to claim 5, wherein the conductor is a half wavelength at the second frequency as measured in the dielectric material.
Claim 9
Dependent Claim
15 words
A multi-band slot antenna according to claim 6, wherein the conductor is a microstrip line.
Claim 10
Dependent Claim
48 words
A multi-band slot antenna according to claim 7, wherein a midpoint of the microstrip line crosses the first slot antenna at a distance from an end of the first slot antenna approximately equal to a quarter wavelength at the second frequency as determined in the conductive ground plane.
Claim 11
Dependent Claim
19 words
A multi-band slot antenna according to claim 6, wherein the dielectric material is partially surrounded by a conductive sheath.
Claim 12
Dependent Claim
18 words
A multi-band slot antenna according to claim 9, wherein the conductive sheath couples to the conductive ground plane.
Claim 13
Dependent Claim
25 words
A multi-band slot antenna according to claim 5, wherein the conductor is a quarter wavelength at the second frequency as measured in the dielectric material.
Claim 14
Dependent Claim
15 words
A multi-band slot antenna according to claim 11, wherein the conductor is a microstrip line.
Claim 15
Dependent Claim
36 words
A multi-band slot antenna according to claim 12, wherein an end of the microstrip line is directly coupled to the conductive ground plane and another end of the microstrip line extends into the first slot antenna.
Claim 16
Dependent Claim
134 words
A radiotelephone comprising: a first slot, that is a quarter wavelength at a first frequency, having an open end and a closed end, implemented in a conductive ground plane; a second slot, that is a quarter wavelength at a second frequency, having an open end and a closed end, implemented in the conductive ground plane; a strip of the conductive ground plane common to the first slot and the second slot; a positive node of a differential excitation port coupled to the conductive ground plane proximate to the first slot at a proportional distance from the closed end of the first slot; and a negative node of the differential excitation port coupled to the conductive ground plane proximate to the second slot at the proportional distance from the closed end of the second slot.
Claim 17
Dependent Claim
134 words
A radiotelephone comprising: a first slot, that is a quarter wavelength at a first frequency, having an open end and a closed end, implemented in a conductive ground plane; a second slot, that is a quarter wavelength at a second frequency, having an open end and a closed end, implemented in the conductive ground plane; a strip of the conductive ground plane common to the first slot and the second slot; a positive node of a differential excitation port coupled to the conductive ground plane proximate to the first slot at a proportional distance from the closed end of the first slot; and a negative node of the differential excitation port coupled to the conductive ground plane proximate to the second slot at the proportional distance from the closed end of the second slot.
Claim 18
Dependent Claim
78 words
A radiotelephone comprising: a slot implemented in a conductive ground plane that is resonant and radiant at a first frequency; and a conductor that is resonant but not appreciably radiant at a second frequency, different than the first frequency, and highly electromagnetically coupled to the first slot at the second frequency while negligibly electromagnetically coupled to the first slot at frequencies other than the second frequency, such that the slot is resonant and radiant at the second frequency.
Claim 19
Dependent Claim
78 words
A radiotelephone comprising: a slot implemented in a conductive ground plane that is resonant and radiant at a first frequency; and a conductor that is resonant but not appreciably radiant at a second frequency, different than the first frequency, and highly electromagnetically coupled to the first slot at the second frequency while negligibly electromagnetically coupled to the first slot at frequencies other than the second frequency, such that the slot is resonant and radiant at the second frequency.
Claim 20
Dependent Claim
51 words
A radiotelephone according to claim 15 wherein the conductor is a microstrip line that is a half wavelength at the second frequency, and a midpoint of the microstrip line crosses the slot at a distance from an end of the slot approximately equal to a quarter wavelength at the second frequency.
References Cited (Backward Citations)
GB2074792A
Cited
US4410890A
Cited
US4864314A
Cited
US5489913A
Cited
US5446471A
Cited
US5600337A
Cited
US5610618A
Cited
WO1996029757A1
Cited
GB1285289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-03-28 | 2003-09-27 | 2004-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-28 | 2007-09-27 | 2008-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-28 | 2011-09-27 | 2012-03-28 | $7700.00 | Window Closed / Lapsed |