Patent US6166694A successfully refreshed from Google Patents.
US6166694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed twin spiral dual band antenna
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1998-07-09
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Granted: 2000-12-26
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Expires: 2018-07-09
Abstract
Abstract The present invention overcomes the above-identified deficiencies in the art by providing a miniature, built-in dual band antenna which is suitable for use in future compact mobile terminals. According to exemplary embodiments, a built-in antenna is provided which includes two spiral conductor arms which are of different lengths and capable of being tuned to different frequency bands. The spiral arms are mounted on the mobile terminal's printed circuit board via a substrate. Matching of the antenna is performed by a matching bridge which is positioned between a feeding pin and grounded post. By adjusting the length of the matching bridge, the matching of the antenna can be changed. In an alternative embodiment, a loading resistor is attached to the matching bridge in order to enhance the bandwidth of the antenna.
Inventors
- 👤 Zhinong Ying
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:06
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H04; H04B; H04B1/00; H04B1/38; H04B1/3827; H04B1/3833; H01Q1/241; H01Q1/242; H01Q1/243; H01Q1/36; H01Q1/38; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/342; H01Q5/357; H01Q5/364; H01Q5/371; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0421; H01Q9/16; H01Q9/26; H01Q9/27
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
96 words
A communication device for use in a radio communication system, said device comprising: a microphone opening for allowing the communication device to receive auditory information from a user; a speaker opening for allowing the communication device to transmit auditory information to said user; a keypad; a multiple band antenna comprising: a first arm and a second arm tuned to different frequency bands; and a matching bridge, connected to a feeding part in which each of the arms are attached, for matching an input impedance of said antenna, wherein said multiple band antenna is a built-in antenna.
Claim 2
Dependent Claim
96 words
A communication device for use in a radio communication system, said device comprising: a microphone opening for allowing the communication device to receive auditory information from a user; a speaker opening for allowing the communication device to transmit auditory information to said user; a keypad; a multiple band antenna comprising: a first arm and a second arm tuned to different frequency bands; and a matching bridge, connected to a feeding part in which each of the arms are attached, for matching an input impedance of said antenna, wherein said multiple band antenna is a built-in antenna.
Claim 3
Dependent Claim
30 words
The communication device of claim 1 wherein said first arm is resonant at frequencies in a lower band and said second arm is resonant at frequencies in a higher band.
Claim 4
Dependent Claim
26 words
The communication device of claim 1 wherein a shape of said first and second arms is one of an inner spiral, outer spiral and meandering shape.
Claim 5
Dependent Claim
22 words
The communication device of claim 1 wherein the matching of said antenna is adjusted by changing a length of the matching bridge.
Claim 6
Dependent Claim
37 words
The communication device of claim 1 wherein said first and second arms are shaped as inner spirals and currents in said first and second arms are fed at an end of an outer turn of said spirals.
Claim 7
Dependent Claim
21 words
The communication device of claim 1 further comprising a printed circuit board onto which said built-in multiple band antenna is mounted.
Claim 8
Dependent Claim
31 words
The communication device of claim 1 wherein lengths of said arms are selected to be approximately 1/4 wavelength of the different frequency bands to which the arms are to be tuned.
Claim 9
Dependent Claim
23 words
The communication device of claim 1 further comprising a loading resistor attached to said matching bridge for enhancing a bandwidth of said antenna.
Claim 10
Dependent Claim
88 words
A communication device for use in a radio communication system, said device comprising: a printed circuit board mounted on a chassis of said communication device; a substrate attached to said printed circuit board and having a predetermined thickness; and an antenna mounted on said substrate and comprising: first and second spiral arms which are resonant at different frequencies and a matching bridge connected to the spiral arms, by way of a feeding point, for matching an input impedance of said antenna, wherein said antenna is a built-in antenna.
Claim 11
Dependent Claim
88 words
A communication device for use in a radio communication system, said device comprising: a printed circuit board mounted on a chassis of said communication device; a substrate attached to said printed circuit board and having a predetermined thickness; and an antenna mounted on said substrate and comprising: first and second spiral arms which are resonant at different frequencies and a matching bridge connected to the spiral arms, by way of a feeding point, for matching an input impedance of said antenna, wherein said antenna is a built-in antenna.
Claim 12
Dependent Claim
30 words
The communication device of claim 9 wherein said first arm is resonant at frequencies in a lower band and said second arm is resonant at frequencies in a higher band.
Claim 13
Dependent Claim
22 words
The communication device of claim 9 wherein the matching of said antenna is adjusted by changing a length of the matching bridge.
Claim 14
Dependent Claim
31 words
The communication device of claim 9 wherein lengths of said arms are selected to be approximately 1/4 wavelength of the different frequency bands to which the arms are to be tuned.
Claim 15
Dependent Claim
23 words
The communication device of claim 9 further comprising a loading resistor attached to said matching bridge for enhancing a bandwidth of said antenna.
Claim 16
Dependent Claim
29 words
The communication device of claim 9 wherein a bandwidth of said antenna depends on a size of said spiral arms and the thickness and dielectric constant of said substrate.
Claim 17
Dependent Claim
63 words
An antenna for a radio communication device, said antenna comprising: two printed spiral arms each of which is tuned to a different frequency band; a matching bridge connected to the spiral arms for matching an input impedance of said antenna; and a loading resistor attached to the matching bridge for enhancing a bandwidth of the antenna wherein said antenna is a built-in antenna.
Claim 18
Dependent Claim
63 words
An antenna for a radio communication device, said antenna comprising: two printed spiral arms each of which is tuned to a different frequency band; a matching bridge connected to the spiral arms for matching an input impedance of said antenna; and a loading resistor attached to the matching bridge for enhancing a bandwidth of the antenna wherein said antenna is a built-in antenna.
Claim 19
Dependent Claim
35 words
The antenna of claim 15 wherein a first arm of said antenna is resonant at frequencies in a lower band and a second arm of said antenna is resonant at frequencies in a higher band.
Claim 20
Dependent Claim
15 words
The antenna of claim 16 wherein said first arm is longer than said second arm.
Claim 21
Dependent Claim
21 words
The antenna of claim 15 wherein the matching of said antenna is adjusted by changing a length of the matching bridge.
Claim 22
Dependent Claim
25 words
The antenna of claim 15 wherein said printed spiral arms are connected to a printed circuit board of said radio communication device via a substrate.
Claim 23
Dependent Claim
30 words
The antenna of claim 19 wherein a bandwidth of said antenna is dependent on a size of said printed spiral arms and a thickness and dielectric constant of said substrate.
Claim 24
Dependent Claim
24 words
The antenna of claim 15 wherein currents in said printed spiral arms are fed at an end of an outer turn of said spirals.
References Cited (Backward Citations)
US676332A
Cited
US1837678A
Cited
US2966679A
Cited
US2993204A
Cited
US3573840A
Cited
AU5589873A
Cited
US4012744A
Cited
US4137534A
Cited
US4121218A
Cited
US4161737A
Cited
US4169267A
Cited
US4229743A
Cited
US4356492A
Cited
DE3129045A1
Cited
US4571595A
Cited
GB2175748A
Cited
US4742359A
Cited
US4723305A
Cited
JPS63219204A
Cited
US4860020A
Cited
US4887265A
Cited
US4868576A
Cited
EP0372720A1
Cited
US5020093A
Cited
US5363114A
Cited
FR2664749A1
Cited
US5204687A
Cited
US5317325A
Cited
US5298910A
Cited
EP0511577A2
Cited
US5216436A
Cited
EP0522806A2
Cited
US5353036A
Cited
US5311201A
Cited
WO1993012559A1
Cited
JPH0637531A
Cited
JPH0690108A
Cited
JPH06152221A
Cited
US5550820A
Cited
EP0590671A1
Cited
EP0593185A1
Cited
US5386203A
Cited
US5446469A
Cited
US5467096A
Cited
US5438339A
Cited
WO1994021003A1
Cited
US5532703A
Cited
US5479178A
Cited
US5451974A
Cited
EP0635898A1
Cited
US5546094A
Cited
US5548827A
Cited
EP0644606A1
Cited
US5436633A
Cited
EP0660440A1
Cited
US5612704A
Cited
US5471221A
Cited
US5600335A
Cited
WO1996027219A1
Cited
US5661496A
Cited
US5594457A
Cited
WO1996038882A1
Cited
EP0747989A1
Cited
WO1997011507A1
Cited
US5635943A
Cited
WO1997015153A1
Cited
US5729531A
Cited
EP0777293A1
Cited
US5870066A
Cited
US5903240A
Cited
WO1997047054A1
Cited
WO1997049141A1
Cited
US5861854A
Cited
JPH10173430A
Cited
EP0855759A2
Cited
EP0884796A2
Cited
US5926139A
Cited
WO1999025042A1
Cited
WO1999025043A1
Cited
US5929825A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-12-26 | 2004-06-26 | 2004-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-26 | 2008-06-26 | 2008-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-26 | 2012-06-26 | 2012-12-26 | $7700.00 | Window Closed / Lapsed |