EP0181200A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Automobile signal receiving apparatus
Assignee: Toyota Motor Corp
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Filing: 1985-11-06
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Granted: —
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Expires: 2005-11-06
Abstract
Abstract The present invention provides an automobile antenna system including a high-frequency pick-up device for receiving broadcast waves and which includes a loop antenna or detection electrode element disposed parallel and in close proximity to the marginal edge of the vehicle body and spaced from the marginal edge of the vehicle body within a range represented by 12 x 10 -3 λ(m) where X is the wavelength of a given broadcast wave measured by metric unit, to detect surface high-frequency currents on the marginal portion of the vehicle body. The high-frequency pick-up device is connected with a varactor diode to adjust the resonance frequency of the antenna system. The tuned frequency of a receiver is used to vary a voltage applied to the cathode of the varactor diode such that the frequency of the antenna system will be coincide with the tuned frequency of the receiver.
Inventors
- 👤 Junzo Ohe
- 👤 Hiroshi Kondo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3283
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
An automobile antenna system comprising high-frequency pick-up means disposed along and in close proximity to a marginal portion of the vehicle body to detect surface high-frequency currents which are induced on the vehicle body by broadcast waves and flow concentrically on the marginal portion of the vehicle body, and varactor diode means connected with said high-frequency pick-up means and adapted to be controlled by a built-in receiver in the vehicle body, the resonance frequency of said antenna system being set to be coincide with the tuned frequency selected at said receiver.
Claim 2
Dependent Claim
91 words
An automobile antenna system comprising high-frequency pick-up means disposed along and in close proximity to a marginal portion of the vehicle body to detect surface high-frequency currents which are induced on the vehicle body by broadcast waves and flow concentrically on the marginal portion of the vehicle body, and varactor diode means connected with said high-frequency pick-up means and adapted to be controlled by a built-in receiver in the vehicle body, the resonance frequency of said antenna system being set to be coincide with the tuned frequency selected at said receiver.
Claim 3
Dependent Claim
49 words
An automobile antenna system as defined in claim 1 wherein said high-frequency pick-up means is spaced from the outer marginal edge of the vehicle body within a range represented by 12 x 10 -3 λ(m) where X is the wavelength of a given broadcast wave measured by metric unit.
Claim 4
Dependent Claim
27 words
An automobile antenna system as defined in claim 1 or 2 wherein said high-frequency pick-up means is located on the rear window frame of the vehicle body.
Claim 5
Dependent Claim
65 words
An automobile antenna system as defined in claim 1 wherein said high-frequency pick-up means comprises a loop antenna a portion of which is positioned in close proximity to the marginal edge portion of the vehicle body, circuit means electrically connected with said loop antenna and including a varactor diode contained therein and a casing for holding said loop antenna and said circuit means in place.
Claim 6
Dependent Claim
40 words
An automobile antenna system as defined in claim 4 wherein said loop antenna is connected in series with a varactor diode and a capacitor with the series capacity thereof being used to determine the resonance frequency of said antenna system.
Claim 7
Dependent Claim
49 words
An automobile antenna system as defined in claim 5 wherein a control voltage associated with the tuned frequency of said receiver is applied to the cathode side of said varactor diode so that the resonance frequency of said antenna will be coincide with the tuned frequency of said receiver.
Claim 8
Dependent Claim
41 words
An automobile antenna system as defined in claim 1 wherein said high-frequency pick-up means is an electrostatic coupling type high-frequency pick-up which comprises detecting electrode means disposed parallel and in close proximity to the marginal edge portion of the vehicle body.
Claim 9
Dependent Claim
108 words
An automobile antenna system comprising high-frequency pick-up means disposed parallel and in close proximity to a marginal edge of the vehicle body and adapted to detect surface high-frequency currents which are induced on the vehicle body by broadcast waves and flow concentrically along said marginal edge of the vehicle body, and varactor diodes electrically connected with said high-frequency pick-up means for respectively receiving FM waves, VHFTV waves and UHFTV waves, one of said varactor diodes corresponding to a broadcast wave band selected at a receiver being varied in capacity such that the resonance frequency of said antenna system will be coincide with the frequency selected by said receiver.
Claim 10
Dependent Claim
108 words
An automobile antenna system comprising high-frequency pick-up means disposed parallel and in close proximity to a marginal edge of the vehicle body and adapted to detect surface high-frequency currents which are induced on the vehicle body by broadcast waves and flow concentrically along said marginal edge of the vehicle body, and varactor diodes electrically connected with said high-frequency pick-up means for respectively receiving FM waves, VHFTV waves and UHFTV waves, one of said varactor diodes corresponding to a broadcast wave band selected at a receiver being varied in capacity such that the resonance frequency of said antenna system will be coincide with the frequency selected by said receiver.
Claim 11
Dependent Claim
49 words
An automobile antenna system as defined in claim 1 or 8 wherein said high-frequency pick-up means includes a casing within which impedance matching means and amplifying means are housed and wherein the output impedance of said amplifying means is coincide with the characteristic impedance of a coaxial antenna cable.
References Cited (Backward Citations)
No citation records indexed.
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