US5812097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual band antenna
Assignee: Qualcomm Inc
•
Filing: 1996-04-30
•
Granted: 1998-09-22
•
Expires: 2016-04-30
Abstract
Abstract A novel and improved dual band antenna system comprising an inner antenna element surrounded by an outer antenna element. In a first embodiment, the inner antenna element radiates and receives RF signals in a first RF band, and the outer antenna element radiates and receives RF signals in a second RF band. Optionally, the inner and outer antennas may be coupled together when operating in the first RF band in order to improve the antenna gain pattern of the dual band antenna. In a second embodiment, the inner antenna element radiates and receives RF signals in both the first and second RF bands. In this second embodiment, when operating in the second RF band, the outer antenna element is grounded, thus altering the signal length of the inner antenna element to resonate in the second RF band.
Inventors
- 👤 David Maldonado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:56
CPC Classifications
H; H01; H01Q; H01Q21/00; H01Q21/30; H01Q5/00; H01Q5/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A dual band antenna system, comprising: a first antenna element having a feed point for receiving a first RF signal within a first frequency band and a second RF signal within a second frequency band, said fast antenna element for transmitting said first and second RF signals; a second antenna element, substantially surrounding said first antenna element, for altering an electrical length of said first antenna element when said fist antenna element is transmitting said second RF signal; a first switch for coupling said first antenna element to said first RF signal when said first antenna element is transmitting said first RF signal and for coupling said first antenna element to said second RF signal when said first antenna element is transmitting said second RF signal; and a second switch for coupling said second antenna element to ground when said first antenna element is transmitting said second RF signal.
Claim 2
Dependent Claim
149 words
A dual band antenna system, comprising: a first antenna element having a feed point for receiving a first RF signal within a first frequency band and a second RF signal within a second frequency band, said fast antenna element for transmitting said first and second RF signals; a second antenna element, substantially surrounding said first antenna element, for altering an electrical length of said first antenna element when said fist antenna element is transmitting said second RF signal; a first switch for coupling said first antenna element to said first RF signal when said first antenna element is transmitting said first RF signal and for coupling said first antenna element to said second RF signal when said first antenna element is transmitting said second RF signal; and a second switch for coupling said second antenna element to ground when said first antenna element is transmitting said second RF signal.
Claim 3
Dependent Claim
64 words
The dual band antenna system of claim 1 wherein said first antenna element has a signal length of one-half a wavelength at said first frequency band when said second antenna element is not coupled to ground, and wherein said first antenna element has a signal length of one-half a wavelength at said second frequency band when said second antenna element is coupled to ground.
Claim 4
Dependent Claim
26 words
The dual band antenna system of claim 2 wherein said first antenna element is a whip antenna and said second antenna element is a sleeve antenna.
Claim 5
Dependent Claim
33 words
The dual band antenna system of claim 3 wherein said second switch couples said second antenna element to said first RF signal when said first antenna element is transmitting said first RF signal.
Claim 6
Dependent Claim
24 words
The dual band antenna system of claim 4 further comprising an insulator for electrically isolating said first antenna element from said second antenna element.
Claim 7
Dependent Claim
85 words
The dual band antenna system of claim 1 further comprising: a first transceiver for generating said first RF signal; a first matching circuit, coupled to said first transceiver and said first antenna element, for matching an impedance of said first antenna element at said first frequency band; a second transceiver for generating said second RF signal; and a second matching circuit, coupled to said second transceiver and said first antenna element, for matching an impedance of said first antenna element at said second frequency band.
References Cited (Backward Citations)
US3139620A
Cited
US3100893A
Cited
US4152705A
Cited
US4095229A
Cited
US4180819A
Cited
US4117492A
Cited
US4121218A
Cited
US4280129A
Cited
US4490727A
Cited
US4285065A
Cited
US4395714A
Cited
WO1984002614A1
Cited
US4494122A
Cited
US4725845A
Cited
US4940989A
Cited
US4748450A
Cited
US4890114A
Cited
US4862182A
Cited
US5072230A
Cited
US4860024A
Cited
US5014346A
Cited
US5048117A
Cited
US5095541A
Cited
US4958382A
Cited
DE3826777A1
Cited
US5079562A
Cited
US5204687A
Cited
US5231412A
Cited
US5202696A
Cited
FR2689688A1
Cited
US5170173A
Cited
US5406296A
Cited
US5300936A
Cited
US5550554A
Cited
US5594461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-09-21 | 2002-03-23 | 2002-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-21 | 2006-03-23 | 2006-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-21 | 2010-03-23 | 2010-09-22 | $7700.00 | Window Closed / Lapsed |