Patent EP0508836A1 successfully refreshed from Google Patents.
EP0508836A1
Expired / Lapsed
EP
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Antenna unit for portable wireless apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1992-04-13
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Granted: —
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Expires: 2012-04-13
Abstract
Abstract An antenna for portable wireless apparatus as shown in Figure 5 is capable of operating satisfactorily when an antenna element (8) is extended out of a case (7) or stowed in the case (7). A portion (8 a ) of the antenna element (8) not stowed in an antenna stowage pipe (12) when the antenna is pushed into the plastic case, functions as a radiation element. A portion of the antenna element and the antenna stowage (12) pipe produced of a metal for stowing this portion constitute an impedance stub circuit. Antenna impedances of the antenna element in the extended and stowage positions as well can be made approximately the same by properly setting the length of the antenna element which is stowed in the antenna stowage pipe and the length of the portion not stowed in the stowage pipe.
Inventors
- 👤 Yoshio Mitsubishi Denki K.K. Toko
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 04:42
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/12; H01Q1/22; H01Q1/24; H01Q1/241; H01Q1/242; H01Q1/243; H01Q1/244; H01Q1/08; H01Q1/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
84 words
An antenna unit, comprising: a case for housing a wireless apparatus body including a receiving-transmitting circuit; an antenna element extendibly mounted in said case and connected with said wireless apparatus body section through an impedance matching circuit and an antenna feeding section; a conductive antenna stowage pipe for holding said antenna element with a part thereof insulated when said antenna element is stowed in said case; and a connecting means for connecting a specific position of said antenna stowage pipe to a reference potential.
Claim 2
Dependent Claim
93 words
The antenna unit as claimed in claim 1, wherein, when said antenna element is stowed in said case, a part of said antenna element stowed in said antenna stowage pipe and said antenna stowage pipe constitute a stub circuit; the other part of said antenna element not stowed in said antenna stowage pipe is fed with power through said antenna feeding section, functioning as a radiation element; and said antenna element, when extended from said case, is fed with power through said antenna feeding section, functioning as a radiation element as a whole.
Claim 3
Dependent Claim
115 words
The antenna unit as claimed in claim 2, wherein the length of a portion of said antenna element extended out of a case and functioning as a radiation element, the length of a portion of said antenna element stowed in said case and functioning as a radiation element, and the length of a portion of said antenna element stowed in an antenna stowage pipe, satisfy such a relation that impedance on the radiation element side as viewed from an antenna feeding section with said antenna element extended out of said case and impedance on the radiation element side as viewed from said antenna feeding section with said antenna element stowed in said case become equal.
Claim 4
Dependent Claim
31 words
The antenna unit as claimed in claim 2, wherein a non-conductive stopper covering the bottom end of said antenna element insures insulation between said antenna element and said antenna stowage pipe.
Claim 5
Dependent Claim
48 words
The antenna unit as claimed in claim 2, wherein a connecting means is provided with a bent sheet-like elastic member interposed between an outside wall of said antenna stowage pipe and an outside wall of said wireless apparatus body and is in contact with both said outside walls.
Claim 6
Dependent Claim
44 words
The antenna unit as claimed in claim 5, wherein said sheet-like elastic member is provided movable in the same direction of movement of said antenna element between said outside wall of said antenna stowage pipe and said outside wall of said wireless apparatus body.
Claim 7
Dependent Claim
24 words
The antenna unit as claimed in claim 2, wherein said conductive antenna stowage pipe has a conductive outside wall and an insulated inside wall.
Claim 8
Dependent Claim
26 words
The antenna unit as claimed in claim 7, wherein said antenna stowage pipe is a plastic pipe coated on the outside surface with a conductive paint.
Claim 9
Dependent Claim
75 words
An antenna unit, comprising: a case for housing a wireless apparatus body including a receiving-transmitting circuit; an antenna element extendibly mounted in said case, and connected with said wireless apparatus body through an impedance matching circuit; a conductive antenna stowage pipe for stowing said antenna element, partly insulated, when said antenna element is stowed in said case; and a connecting means for connecting a specific position of said antenna stowage pipe with a reference potential.
Claim 10
Dependent Claim
87 words
The antenna unit as claimed in claim 9, wherein, when said antenna element is stowed in said case, a portion of said antenna stowed in said antenna stowage pipe and said antenna stowage pipe constitute a stub circuit, and a portion of said antenna element not stowed in said antenna stowage pipe is fed with power, functioning as a radiation element; and when said antenna element is extended out of said case, said antenna element is fed with power, functioning as a radiation element as a whole.
Claim 11
Dependent Claim
32 words
The antenna unit as claimed in claim 10, wherein said antenna element is connected with an impedance matching circuit by a bent sheet-like elastic member having elasticity on said antenna element side.
References Cited (Backward Citations)
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