EP0429255A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Three-wave shared antenna (radio, AM and FM) for automobile
Assignee: Harada Industry Co Ltd
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Filing: 1990-11-15
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Granted: —
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Expires: 2010-11-15
Abstract
Abstract A three-wave shared antenna used in an automobile comprises an MT wave element (10A) characterized in that first and second phasing coils (11 and 12) are formed in an intermediate position of a conductive mast thereby forming the MT wave element (10A) is formed in a three-step collinear manner to be able to transmit/receive an MT wave, a trap element (10B) for interrupting the MT wave formed on top portion of the MT wave element (10A), and an auxiliary element (10C) for AM and FM waves, which comprises another conductive mast connected to said conductive mast through the trap element (10B) to be able to receive AM wave, which is a broadcast wave of an amplitude modulation system and FM wave, which is a broadcast wave of a frequency modulation system, in cooperation with said MT wave element (10A). Then, the electrical length of said auxiliary element (10C) for AM and FM waves is set to (3/4) wavelength of the electrical wave of the frequency close to the frequency of the transmission side in a radio telephone band, and the electrical length of said MT wave element (10A) is set to an electrical length in which the sum L of the length of said MT wave element (10A) and that of said auxiliary element (10C) for AM and FM waves adjusts to the reception of the FM wave.
Inventors
- 👤 Yoshimi C/O Harada Industry Co. Ltd. Egashira
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 02:08
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/08; H01Q1/10; H01Q1/27; H01Q1/32; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/314; H01Q5/321
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
237 words
A three-wave shared antenna used in an automobile characterized in that the three-wave shared antenna can receive/transmit a radio mobile telephone wave, that is, an MT wave, and receive broadcast waves, that is, an AM wave and an FM, comprising: an MT wave element (10A) characterized in that first and second phasing coils (11, 12) are formed in an intermediate position of a conductive mast thereby forming the MT wave element (10A) is formed in a three-step collinear manner to be able to transmit/receive an MT wave; a trap element (10B) for interrupting the MT wave formed on top portion of the MT wave element (10A); and an auxiliary element (10C) for AM and FM waves comprising another conductive mast connected to said conductive mast through the trap element (10B) to be able to receive AM and FM wave in cooperation with said MT wave element (10A), characterized in that the electrical length of said auxiliary element (10C) for AM and FM waves is set to (3/4) wavelength of the electrical wave of the frequency close to the frequency of the transmission side in a radio telephone band, and the electrical length of said MT wave element (10A) is set to an electrical length in which the sum of the length of said MT wave element (10A) and that of said auxiliary element (10C) for AM and FM waves adjusts to the reception of the FM wave.
Claim 2
Dependent Claim
237 words
A three-wave shared antenna used in an automobile characterized in that the three-wave shared antenna can receive/transmit a radio mobile telephone wave, that is, an MT wave, and receive broadcast waves, that is, an AM wave and an FM, comprising: an MT wave element (10A) characterized in that first and second phasing coils (11, 12) are formed in an intermediate position of a conductive mast thereby forming the MT wave element (10A) is formed in a three-step collinear manner to be able to transmit/receive an MT wave; a trap element (10B) for interrupting the MT wave formed on top portion of the MT wave element (10A); and an auxiliary element (10C) for AM and FM waves comprising another conductive mast connected to said conductive mast through the trap element (10B) to be able to receive AM and FM wave in cooperation with said MT wave element (10A), characterized in that the electrical length of said auxiliary element (10C) for AM and FM waves is set to (3/4) wavelength of the electrical wave of the frequency close to the frequency of the transmission side in a radio telephone band, and the electrical length of said MT wave element (10A) is set to an electrical length in which the sum of the length of said MT wave element (10A) and that of said auxiliary element (10C) for AM and FM waves adjusts to the reception of the FM wave.
Claim 3
Dependent Claim
169 words
A three-wave shared antenna used in an automo bile according to claim 1, characterized in that where the wavelength of the electrical wave of the frequency, which is close to the frequency of the transmission side in the radio telephone band is λ, the MT wave element (10A) comprises a first element (S1) projecting a wall of a car body and comprising a conductive mast whose electrical length is (3/8)λ; a second element (52) forming on top portion of the first element (S1) and comprising a first phasing coil (11) whose electrical length is (1/4)λ, a third element (S3) forming on top portion of the second element (S2) and comprising a conductive mast whose electrical length is (3/4), a fourth element (S4) forming on top portion of the third element (S3) and comprising a second phasing coil (12) whose electrical length is (1/4)λ, and a fifth element (S5) forming on top portion of the fourth element (S4) and comprising a helical coil whose electrical length is (5/8 to 3/4)λ.
Claim 4
Dependent Claim
207 words
A three-wave shared antenna used in an automobile according to claim 2, characterized in that conductive pipes having different diameters are slidably connected to each other, thereby forming the freely extendible third element (S3), the conductive pipe having the largest diameter in the third element (S3) is coupled to the top portion of the second element (S2); a wire (64) is wound around the outer periphery of a cylindrical insulating material (63) with a different pitch (Pa, Pb, Pc) in accordance with the function of respective elements, thereby the fourth element (S4) comprising the second phasing coil (12), the fifth element (S5) comprising the helical coil, and a sixth element (S6) comprising a trap element (10B) are integrally formed and detachably inserted into the first to the third elements (S1 to S3); and the conductive mast, which is the auxiliary element (10C) for the AM and FM waves, characterized in that the electrical length of said auxiliary element (10C) for AM and FM waves is set to (3/4) wavelength of the electrical wave of the frequency close to the frequency of the transmission side in the radio telephone band, is detachably inserted into the cylindrical insulting material (63) in the fourth to sixth elements (S4 to S6).
References Cited (Backward Citations)
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