EP0350308A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
A three-band antenna for vehicles
Assignee: Harada Industry Co Ltd
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Filing: 1989-07-06
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Granted: —
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Expires: 2009-07-06
Abstract
Abstract A three-band automobile antenna assembly including an antenna mast (10) made up of two slidably and coaxially connected antenna tubes (11, 12), one of which negates a reversed-phase current for the telephone, and an antenna accommodation tube (13) which houses the antenna mast (10) therein in such a manner that the antenna mast (10) is freely retracted into and withdrawn from the tube. The antenna assembly further includes a separator (81, 82) which is connected to a feeding section of the antenna accommodation tube (13) to separate three bands consisting of telephone, FM and AM waves, and a mount (14) made primarily of plastic to mount the antenna accommodation tube (13) to the vehicle body (15). The electrical length between outer conductor of the feeding cable (21) and vehicle body (15) is set to be 0 to X/2 so that the impedance of ground circuit is substantially zero.
Inventors
- 👤 Yoshimi Egashira
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 11:26
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/12; H01Q1/1207; H01Q1/1214; H01Q5/00; H01Q5/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
168 words
A three-band antenna assembly for use in vehicles characterized in that said antenna assembly comprises: an antenna mast (10) formed by coaxially connecting two antenna elements (11, 12) so as to slide relative to each other, one of said antenna elements having a phase coil section (40) for negating reversed-phase current used for a telephone; an antenna accommodation tube (13) which accommodates said antenna mast (10) so that said antenna mast can be freely inserted into and withdrawn from said antenna accommodation tube; a separating means (81, 82) which separates three bands consisting of telephone, FM and AM bands, said separating means being connected to a feeding section (19) of said antenna accommodation tube (13); a mount (14) for mounting said antenna accommodation tube (13) to the vehicle body wall (15), said mount being made primarily of resins; and a means (60, 69) for rendering the impedance of a ground path which connects a ground part of said feeding section (19) and said vehicle body (15) to zero.
Claim 2
Dependent Claim
168 words
A three-band antenna assembly for use in vehicles characterized in that said antenna assembly comprises: an antenna mast (10) formed by coaxially connecting two antenna elements (11, 12) so as to slide relative to each other, one of said antenna elements having a phase coil section (40) for negating reversed-phase current used for a telephone; an antenna accommodation tube (13) which accommodates said antenna mast (10) so that said antenna mast can be freely inserted into and withdrawn from said antenna accommodation tube; a separating means (81, 82) which separates three bands consisting of telephone, FM and AM bands, said separating means being connected to a feeding section (19) of said antenna accommodation tube (13); a mount (14) for mounting said antenna accommodation tube (13) to the vehicle body wall (15), said mount being made primarily of resins; and a means (60, 69) for rendering the impedance of a ground path which connects a ground part of said feeding section (19) and said vehicle body (15) to zero.
Claim 3
Dependent Claim
158 words
A three-band antenna assembly for use in vehicles characterized in that said antenna assembly comprises: an antenna mast (10) comprising coaxially connected first and second antenna elements (11, 12), said first antenna element (11) being slidable inside said second antenna element (12) which has a phase coil section (40) for negating reversed-phase current used for a telephone; an antenna accommodation tube (13) which accommodates said antenna mast (10) so that said antenna mast can be freely inserted into and withdrawn from said antenna accommodation tube; a separating means (81, 82) which separates three bands consisting of telephone, FM and AM bands, said separating means being connected to a feeding section (19) of said antenna accommodation tube (13); and a mount (14) for mounting said antenna accommodation tube to the vehicle body wall (15); characterized by impedance of a ground path between a ground part of said feeding section (19) and said vehicle body wall (15) is approximately zero.
Claim 4
Dependent Claim
158 words
A three-band antenna assembly for use in vehicles characterized in that said antenna assembly comprises: an antenna mast (10) comprising coaxially connected first and second antenna elements (11, 12), said first antenna element (11) being slidable inside said second antenna element (12) which has a phase coil section (40) for negating reversed-phase current used for a telephone; an antenna accommodation tube (13) which accommodates said antenna mast (10) so that said antenna mast can be freely inserted into and withdrawn from said antenna accommodation tube; a separating means (81, 82) which separates three bands consisting of telephone, FM and AM bands, said separating means being connected to a feeding section (19) of said antenna accommodation tube (13); and a mount (14) for mounting said antenna accommodation tube to the vehicle body wall (15); characterized by impedance of a ground path between a ground part of said feeding section (19) and said vehicle body wall (15) is approximately zero.
Claim 5
Dependent Claim
18 words
A three-band antenna assembly according to claim 2, characterized in that said mount (14) is made of resins.
Claim 6
Dependent Claim
28 words
A three-band antenna assembly according to claim 2, characterized in that said separating means (81, 82) comprises L elements consisting of coils and C elements consisting of condensers.
References Cited (Backward Citations)
No citation records indexed.
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