Patent US5521605A successfully refreshed from Google Patents.
US5521605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extendable antenna for a radio transceiver
Assignee: Toshiba Corp
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Filing: 1994-10-07
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Granted: 1996-05-28
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Expires: 2014-10-07
Abstract
Abstract The present invention relates to an extendable antenna for use in a portable radio transceiver. The extendable antenna has a first antenna portion and a second antenna portion connected with a connecting portion of the first antenna portion. The first antenna portion includes a loading coil which is enclosed in a top end cap. When the second antenna portion is retracted into a housing, the connecting portion is held by a holding member disposed in the top of the housing, and the connecting portion is electrically connected with the circuitry of the transceiver via the holding member. In one embodiment, the electrical length of the loading coil is a quarter wavelength, while the physical length of the loading coil is much less than a quarter wavelength. Accordingly, even if the top end cap is the only portion of the extendable antenna located outside the housing, the first antenna portion detects a radio frequency signal. Furthermore, it is unnecessary for the radio transceiver to have an inner antenna and a rod antenna, and switching means for switching from the rod antenna to the inner antenna. It is also unnecessary for the housing to have space for the inner antenna.
Inventors
- 👤 Noboru Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:48
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243; H01Q1/244
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
129 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion electrically connected with the circuitry of said transceiver; said extendable antenna comprising: first antenna means having a loading coil, and a conductive connecting portion in a bottom end of said first antenna means, the electrical length of said loading coil being substantially a quarter wavelength; and second antenna means connected with said connecting portion, and having a conductive bottom portion, wherein when said extendable antenna is extended from said housing, said conductive bottom portion of said second antenna means contacts said feeding portion, when said second antenna means is retracted into said housing, said conductive connecting portion contacts said feeding portion and said loading coil is located out of said housing.
Claim 2
Dependent Claim
129 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion electrically connected with the circuitry of said transceiver; said extendable antenna comprising: first antenna means having a loading coil, and a conductive connecting portion in a bottom end of said first antenna means, the electrical length of said loading coil being substantially a quarter wavelength; and second antenna means connected with said connecting portion, and having a conductive bottom portion, wherein when said extendable antenna is extended from said housing, said conductive bottom portion of said second antenna means contacts said feeding portion, when said second antenna means is retracted into said housing, said conductive connecting portion contacts said feeding portion and said loading coil is located out of said housing.
Claim 3
Dependent Claim
68 words
An extendable antenna according to claim 1 wherein said radio transceiver has a ground portion, the electrical length from said conductive connecting portion to said conductive bottom portion of said second antenna means is substantially N times as long as a quarter wavelength, where N is an odd number, and when said second antenna means is retracted into said housing, said conductive bottom portion contacts said ground portion.
Claim 4
Dependent Claim
31 words
An extendable antenna for a radio transceiver according to claim 1 wherein said first antenna means has a top end cap, said loading coil is enclosed into said top end cap.
Claim 5
Dependent Claim
69 words
An extendable antenna for a radio transceiver according to claim 1 wherein said housing has a top portion, said feeding portion is a holding member disposed in said top portion, when said extendable antenna is extended from said housing, said conductive bottom portion is held by said holding member, when said second antenna means is retracted into said housing, said conductive connecting portion is held by said holding member.
Claim 6
Dependent Claim
68 words
An extendable antenna for a radio transceiver according to claim 4 wherein said second antenna means has a stopper portion disposed in said bottom portion, said holding member has elastic tongues, when said extendable antenna is extended from said housing, said stopper portion is engaged with said elastic tongues, when said second antenna means is retracted into said housing, said connecting portion is held by said elastic tongues.
Claim 7
Dependent Claim
62 words
An extendable antenna for a radio transceiver according to claim 4 wherein said holding member has a circular hole, said top end cap is circular, with the diameter of said top end cap being lager than the inner diameter of said hole, so that when said second antenna portion is retracted into said housing, said top end cap strikes against said housing.
Claim 8
Dependent Claim
39 words
An extendable antenna for a radio transceiver according to claim 1 wherein said second antenna means comprises a first elongated portion connected with said first antenna means and a second elongated portion slidably connected with said first elongated portion.
Claim 9
Dependent Claim
21 words
An extendable antenna for a radio transceiver according to claim 7 wherein said second elongated portion is comprised of flexible material.
Claim 10
Dependent Claim
22 words
An extendable antenna according to claim 1 wherein said loading coil is enclosed within a top end cap of said extendable antenna.
Claim 11
Dependent Claim
140 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion electrically connected with the circuitry of said transceiver; said extendable antenna comprising: first antenna means having a loading coil, and a conductive connecting portion in a bottom end of said first antenna means, the electrical length of said loading coil being substantially N times as long as a quarter wavelength, where N is an integral number; and second antenna means connected with said connecting portion, and having a conductive bottom portion, wherein when said extendable antenna is extended from said housing, said conductive bottom portion of said second antenna means contacts said feeding portion, when said second antenna means is retracted into said housing, said conductive connecting portion contacts said feeding portion and said loading coil is located out of said housing.
Claim 12
Dependent Claim
140 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion electrically connected with the circuitry of said transceiver; said extendable antenna comprising: first antenna means having a loading coil, and a conductive connecting portion in a bottom end of said first antenna means, the electrical length of said loading coil being substantially N times as long as a quarter wavelength, where N is an integral number; and second antenna means connected with said connecting portion, and having a conductive bottom portion, wherein when said extendable antenna is extended from said housing, said conductive bottom portion of said second antenna means contacts said feeding portion, when said second antenna means is retracted into said housing, said conductive connecting portion contacts said feeding portion and said loading coil is located out of said housing.
Claim 13
Dependent Claim
36 words
An extendable antenna for a radio transceiver according to claim 10 wherein said electrical length of said second antenna portion is substantially N times as long as a quarter wavelength, where N is an integral number.
Claim 14
Dependent Claim
86 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion electrically connected with the circuitry of said transceiver; said extendable antenna comprising: first antenna means having a loading coil, and a connecting portion in a bottom end of said first antenna means, second antenna means connected with said connecting portion, wherein when said second antenna means is retracted into said housing, said connecting portion contacts said feeding portion and said loading coil is located out of said housing.
Claim 15
Dependent Claim
86 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion electrically connected with the circuitry of said transceiver; said extendable antenna comprising: first antenna means having a loading coil, and a connecting portion in a bottom end of said first antenna means, second antenna means connected with said connecting portion, wherein when said second antenna means is retracted into said housing, said connecting portion contacts said feeding portion and said loading coil is located out of said housing.
Claim 16
Dependent Claim
88 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion electrically connected with the circuitry of said transceiver, said extendable antenna comprising: first antenna means having a loading portion and a connecting portion in a bottom end of the first antenna means; and second antenna means connected with said connecting portion, wherein when said second antenna means is retracted into said housing, said connecting portion contacts said feeding portion and said first antenna means is disposed to receive RF signals.
Claim 17
Dependent Claim
88 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion electrically connected with the circuitry of said transceiver, said extendable antenna comprising: first antenna means having a loading portion and a connecting portion in a bottom end of the first antenna means; and second antenna means connected with said connecting portion, wherein when said second antenna means is retracted into said housing, said connecting portion contacts said feeding portion and said first antenna means is disposed to receive RF signals.
Claim 18
Dependent Claim
80 words
A radio transceiver enclosed in a housing comprising: a circuitry; a feeding portion electrically connected with said circuitry; and an extendable antenna comprising: first antenna means having a loading coil, and a connecting portion in a bottom end of said first antenna means; and second antenna means connected with said connecting portion, wherein when said second antenna means is retracted into said housing, said connecting portion contacts said feeding portion and said loading coil is located out of said housing.
Claim 19
Dependent Claim
80 words
A radio transceiver enclosed in a housing comprising: a circuitry; a feeding portion electrically connected with said circuitry; and an extendable antenna comprising: first antenna means having a loading coil, and a connecting portion in a bottom end of said first antenna means; and second antenna means connected with said connecting portion, wherein when said second antenna means is retracted into said housing, said connecting portion contacts said feeding portion and said loading coil is located out of said housing.
Claim 20
Dependent Claim
129 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion fixed to said housing and electrically connected with circuitry of said transceiver, said extendable antenna comprising: a first antenna portion having a loading coil; a second antenna portion which is extendable from said housing or retracted into said housing; a conductive connecting portion connecting a bottom end of said first antenna portion to a top end of said second antenna portion, said conductive connecting portion contacting said feeding portion when said second antenna portion is retracted into said housing; a conductive stopper portion connected to a bottom end of said second antenna portion, said conductive stopper portion contacting said feeding portion when said second antenna portion is extended from said housing.
Claim 21
Dependent Claim
129 words
An extendable antenna for a radio transceiver enclosed in a housing, said radio transceiver having a feeding portion fixed to said housing and electrically connected with circuitry of said transceiver, said extendable antenna comprising: a first antenna portion having a loading coil; a second antenna portion which is extendable from said housing or retracted into said housing; a conductive connecting portion connecting a bottom end of said first antenna portion to a top end of said second antenna portion, said conductive connecting portion contacting said feeding portion when said second antenna portion is retracted into said housing; a conductive stopper portion connected to a bottom end of said second antenna portion, said conductive stopper portion contacting said feeding portion when said second antenna portion is extended from said housing.
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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) | 1999-05-28 | 1999-11-27 | 2000-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-28 | 2003-11-27 | 2004-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-28 | 2007-11-27 | 2008-05-28 | $7700.00 | Window Closed / Lapsed |