US5561439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Car phone antenna
Assignee: Nokia Oyj
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Filing: 1995-08-24
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Granted: 1996-10-01
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Expires: 2015-08-24
Abstract
Abstract An antenna comprises a radiating element and a cone-shaped ground plate the relative distance between which can be altered thus altering the resonant frequency of the antenna and a base. The resulting antenna is a wideband quarter-wave vertical antenna which can be employed for testing in the 1.8 GHz frequency range and for temporary use in all car phones as well as in fixed stations.
Inventors
- 👤 Mikko K. Moilanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:46
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3275; H01Q9/00; H01Q9/04; H01Q9/30; H01Q9/32; H01Q9/38
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
An antenna comprising a conducting ground plate having a frustoconical shape, a radiating element having a rod shape and extending away from the ground plate in a first direction, an adjusting element which is disposed between the radiating element and the ground plate, and mounting means extending away from the ground plate in a second direction opposite the first direction for supporting the antenna; wherein the mounting means comprises coaxial attachment means connecting with the ground plate and the radiating element, and the adjusting element is disposed on a frustoconical portion of the ground plate; and wherein the adjusting element contacts said radiating element, and is operative mechanically to displace the radiating element relative to the ground plate with a resulting alteration of a resonance frequency of the antenna.
Claim 2
Dependent Claim
129 words
An antenna comprising a conducting ground plate having a frustoconical shape, a radiating element having a rod shape and extending away from the ground plate in a first direction, an adjusting element which is disposed between the radiating element and the ground plate, and mounting means extending away from the ground plate in a second direction opposite the first direction for supporting the antenna; wherein the mounting means comprises coaxial attachment means connecting with the ground plate and the radiating element, and the adjusting element is disposed on a frustoconical portion of the ground plate; and wherein the adjusting element contacts said radiating element, and is operative mechanically to displace the radiating element relative to the ground plate with a resulting alteration of a resonance frequency of the antenna.
Claim 3
Dependent Claim
34 words
An antenna as claimed in claim 1, wherein the antenna has an input impedance, and the ground plate has the form of a truncated cone for adjusting the input impedance to a constant level.
Claim 4
Dependent Claim
48 words
An antenna as claimed in claim 1, wherein the ground plate is a truncated cone-shaped ground plate and extends substantially away from the radiating element, a lower part of the radiating element forming a connection means which extends into the truncated cone to connect with the attachment means.
Claim 5
Dependent Claim
38 words
An antenna as claimed in claim 3, wherein part of the connection means is provided with adjustment means, the adjustment means cooperating with the adjusting element for adjusting the distance between the radiating element and the ground plate.
Claim 6
Dependent Claim
42 words
An antenna as claimed in claim 4, wherein the adjustment means comprises a screw thread, and the adjusting element comprises a threaded nut complementary to the screw thread and located at the ground plate, the screw thread mating with the threaded nut.
Claim 7
Dependent Claim
21 words
An antenna as claimed in claim 1, further comprising a magnetic base for supporting the ground plate and the radiating element.
Claim 8
Dependent Claim
34 words
An antenna as claimed in claim 6, wherein the attachment means is lockable, and wherein the ground plate and the radiating element are releasably connected to the magnetic base by the lockable attachment means.
Claim 9
Dependent Claim
20 words
An antenna as claimed in claim 7, wherein the attachment means is in the form of a coaxial bayonet fitting.
Claim 10
Dependent Claim
22 words
An antenna as claimed in claim 1, wherein the mounting means further comprises a base tube extending downwards from the ground plate.
Claim 11
Dependent Claim
31 words
An antenna as claimed in claim 1 wherein the radiating element faces an exterior surface of the ground plate and the mounting means faces an interior surface of the ground plate.
Claim 12
Dependent Claim
17 words
An antenna as claimed in claim 10 wherein the radiating element is coaxial to the ground plate.
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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) | 1999-10-01 | 2000-04-01 | 2000-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-10-01 | 2004-04-01 | 2004-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-10-01 | 2008-04-01 | 2008-10-01 | $7700.00 | Window Closed / Lapsed |