EP0660440A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Retractable antenna
Assignee: Nokia Oyj
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Filing: 1994-12-15
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Granted: —
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Expires: 2014-12-15
Abstract
Abstract A helical antenna (17) is permanently mounted onto the housing (15) of a radio transmitter/receiver, such as a mobile cellular telephone. An elongate antenna (18) is mountable within the housing so as to be movable between a retracted position (Figure 1) and an extended position (2). The elongate antenna (18) has a conductive portion (18c) arranged to short-circuit the helical antenna (17) when said helical antenna is placed in its extended position.
Inventors
- 👤 Richard Alexander Cole
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:07
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: 11
Claim 1
Independent Claim
65 words
An antenna assembly mountable onto a housing for a radio device, comprising a helical antenna permanently mountable on said housing, and an elongate antenna mountable within said housing so as to be movable between a retracted position and an extended position, wherein said elongate antenna has a conductive portion arranged to short-circuit the helical antenna when said elongate antenna is placed in its extended position.
Claim 2
Dependent Claim
15 words
An antenna assembly according to claim 1, wherein the radio device is a radio transmitter.
Claim 3
Dependent Claim
14 words
An antenna assembly according to claim 1, wherein said radio device is a receiver.
Claim 4
Dependent Claim
15 words
An antenna assembly according to claim 1, wherein said radio device is a cellular telephone.
Claim 5
Dependent Claim
31 words
An antenna assembly according to any of claims 1 to 4, wherein the helical antenna is mounted to a housing by being electrically connected at one end to an electrical contact.
Claim 6
Dependent Claim
18 words
An antenna assembly according to claim 5, wherein said contact supplies radio frequency signals to said connected end.
Claim 7
Dependent Claim
17 words
An antenna assembly according to claim 6, wherein the other end of said helix is open circuit.
Claim 8
Dependent Claim
23 words
An antenna assembly according to any of claims 1 to 7, wherein the elongate antenna extends within the core of the helical antenna.
Claim 9
Dependent Claim
27 words
An antenna assembly according to claim 8, wherein the coil diameter of the helical antenna reduces at its ends so as to contact with the elongate antenna.
Claim 10
Dependent Claim
35 words
An antenna assembly according to any of claims 1 to 9, wherein the retractable antenna includes a non-conductive end portion which enters the helix core when the elongate antenna is placed in its retracted position.
Claim 11
Dependent Claim
69 words
In a mobile cellular telephone device, a method of effecting use of an elongate antenna in order to replace use of a helical antenna, comprising the steps of extending an elongate antenna from a retracted position into an extended position, wherein, when in said extended position, said elongate antenna has a conductive portion arranged to short-circuit the helical antenna, thereby effectively removing said helical antenna from the electrical circuit.
References Cited (Backward Citations)
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