EP0375415A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Plane slot antennas and their use in motor vehicles
Assignee: Harada Industry Co Ltd
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Filing: 1989-12-21
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Granted: —
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Expires: 2009-12-21
Abstract
Abstract A plane antenna for automobiles including a peripheral conducting surface (10), a first inner conducting surface (11) provided in the peripheral conducting surface with a space (21) in between, a second inner conducting surface (12) provided in the first inner conducting surface with a space (22) in between. A core conductor (31) of a first coaxial line (30) is connected to the first inner conducting surface and an outer skin (32) of the first coaxial line is connected to the peripheral conducting surface, and a core conductor (41) of a second coaxial line (40) is connected to the second inner conducting surface and an outer skin (42) of the second coaxial line is connected to the first inner conducting surface. The second coaxial line can be divided into two sections (40a, 50) so that these sections are inductively connected to each other by coils.
Inventors
- 👤 Takuji Harada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 05:45
CPC Classifications
G; G06; G06F; G06F9/00; G06F9/06; G06F9/30; G06F9/38; G06F9/3867; G06F9/3873; H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3275; H01Q13/00; H01Q13/10; H01Q21/00; H01Q21/28; H01Q5/00; H01Q5/40; H01Q9/00; H01Q9/04; H01Q9/0407; H01Q9/0464
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
32 words
A plane antenna characterized in that said antenna comprises a first closed-circle slot (21) and a second closed-circle slot (22) which is provided in the central part of said first closed-circle slot.
Claim 2
Dependent Claim
32 words
A plane antenna characterized in that said antenna comprises a first closed-circle slot (21) and a second closed-circle slot (22) which is provided in the central part of said first closed-circle slot.
Claim 3
Dependent Claim
60 words
A plane antenna according to Claim 1, characterized in that an output cable (40) from said second closed-circle slot is interrupted when communications are received by said first closed-circle slot, and a central conductor (11) surrounded by said first closed-circuit slot is used as a peripheral conductor as a ground plane when communications are received by said second closed-circle slot.
Claim 4
Dependent Claim
36 words
A plane antenna according to claim 1 or 2, characterized in that a coupling element consisting of induction coils (43, 53) is inserted at an intermediate point along said output cable from said second closed-circle slot.
Claim 5
Dependent Claim
22 words
A plane antenna according to claim 3, characterized in that said induction coils are installed substantially directly above said first closed-circle slot.
Claim 6
Dependent Claim
40 words
A plane antenna characterized in that said antenna comprises a slot antenna which receives communications by means of a closed-circle slot and a strip-form flat-plate antenna which uses a central conductor surrounded by said closed-circle slot as a ground plate.
Claim 7
Dependent Claim
40 words
A plane antenna characterized in that said antenna comprises a slot antenna which receives communications by means of a closed-circle slot and a strip-form flat-plate antenna which uses a central conductor surrounded by said closed-circle slot as a ground plate.
Claim 8
Dependent Claim
53 words
A plane antenna according to claim 5, characterized in that an output cable from said strip-form flat-plate antenna is interrupted when communications are received by said slot, said antenna, and a central conductor surrounded by said closed-circle slot is used as a ground plate when communications are received by said strip-form flat-plate antenna.
Claim 9
Dependent Claim
34 words
A plane antenna according to claim 5 or 6, characterized in that said coupling element consisting of induction coils is inserted at an intermediate point along said output cable from said strip-form flat-plate antenna.
Claim 10
Dependent Claim
21 words
A plane antenna according to claim 7, characterized in that said induction coils are installed substantially directly above said closed-circle slot.
Claim 11
Dependent Claim
21 words
A plane antenna according to claim 5, characterized in that said strip-form flat-plate antenna is constructed from a printed circuit board.
Claim 12
Dependent Claim
130 words
A plane antenna for automobiles characterized by comprising: a peripheral conducting surface (10); a first inner conducting surface (11) provided in said peripheral conducting surface with a space (21) in between; a second inner conducting surface (12) provided in said first inner conducting surface with a space (22) in between; a first coaxial line (30), a core conductor (31) of said first coaxial line being connected to said first inner conducting surface and an outer skin (32) of said first coaxial line being connected to said peripheral conducting surface; and a second coaxial line (40) a core conductor (41) of said second coaxial line being connected to said second inner conducting surface and an outer skin (42) of said second coaxial line being connected to said first inner conducting surface.
Claim 13
Dependent Claim
130 words
A plane antenna for automobiles characterized by comprising: a peripheral conducting surface (10); a first inner conducting surface (11) provided in said peripheral conducting surface with a space (21) in between; a second inner conducting surface (12) provided in said first inner conducting surface with a space (22) in between; a first coaxial line (30), a core conductor (31) of said first coaxial line being connected to said first inner conducting surface and an outer skin (32) of said first coaxial line being connected to said peripheral conducting surface; and a second coaxial line (40) a core conductor (41) of said second coaxial line being connected to said second inner conducting surface and an outer skin (42) of said second coaxial line being connected to said first inner conducting surface.
Claim 14
Dependent Claim
29 words
A plane antenna for automobiles according to claim 10, characterized in that said second inner conductive surface is a flat conductive plate positioned above said second inner conducting surface.
Claim 15
Dependent Claim
32 words
A plane antenna for automobiles according to claim 10, characterized in that said second coaxial line is divided into two sectiors (40a, 50) which are inductively connected to each other with coils.
References Cited (Backward Citations)
No citation records indexed.
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