US4789866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automobile antenna system
Assignee: Toyota Motor Corp
•
Filing: 1985-11-07
•
Granted: 1988-12-06
•
Expires: 2005-11-07
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 12×10 -3 λ(m) where λ is the wavelength of a given broadcast wave measured metric units, 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 coincide with the tuned frequency of the receiver.
Inventors
- 👤 Junzo Ohe
- 👤 Hiroshi Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
H; H01; H01Q; H01Q1/00; H01Q1/27; H01Q1/32; H01Q1/325; H01Q1/3283
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
151 words
An automobile antenna system which operates in conjunction with a built-in receiver in the vehicle body, said antenna system comprising: high-frequency pick-up means for detecting surface high-frequency currents induced on the vehicle body by broadcast waves which flow concentratedly on a marginal portion of the vehicle body, said high-frequency pick-up means being disposed along and spaced apart from an outer marginal edge of the vehicle body at substantial (12×10 -3 )λ(m), where λ is the wavelength of a broadcase wave to be received measured in metric units; circuit means for processing a signal detected by said high-frequency pick-up means; a casing housing said high-frequency pick-up means and said circuit means; and varactor diode means connected between said high-frequency pick-up means and said circuit means and being controlled by the built-in receiver for setting the resonance frequency of said antenna system to coincide with a tuned frequency selected by the built-in receiver.
Claim 2
Dependent Claim
151 words
An automobile antenna system which operates in conjunction with a built-in receiver in the vehicle body, said antenna system comprising: high-frequency pick-up means for detecting surface high-frequency currents induced on the vehicle body by broadcast waves which flow concentratedly on a marginal portion of the vehicle body, said high-frequency pick-up means being disposed along and spaced apart from an outer marginal edge of the vehicle body at substantial (12×10 -3 )λ(m), where λ is the wavelength of a broadcase wave to be received measured in metric units; circuit means for processing a signal detected by said high-frequency pick-up means; a casing housing said high-frequency pick-up means and said circuit means; and varactor diode means connected between said high-frequency pick-up means and said circuit means and being controlled by the built-in receiver for setting the resonance frequency of said antenna system to coincide with a tuned frequency selected by the built-in receiver.
Claim 3
Dependent Claim
25 words
An automobile antenna system as defined in claim 1 wherein said high-frequency pick-up means is located on the rear window frame of the vehicle body.
Claim 4
Dependent Claim
36 words
An automobile antnna 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.
Claim 5
Dependent Claim
41 words
An automobile antenna system as defined in claim 3 wherein said loop antenna is connected in series with said varactor diode means and a capacitor with the series capacity thereof being used to determine the resonance frequency of said antenna system.
Claim 6
Dependent Claim
52 words
An automobile antenna system as defined in claim 4 wherein the control voltage associated with the tuned frequency of the built-in receiver is applied to the cathode side of said varactor diode means so that the resonance frequency of said antenna system will coincide with the tuned frequency of the built-in receiver.
Claim 7
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 8
Dependent Claim
54 words
An automobile antenna system as defined in claim 1, said varactor diode means comprising a plurality of varactor diodes electrically connected with said high-frequency pick-up means for selectively setting the resonance frequency of said antenna system for any one of FM waves, VHFTV waves and UHFTV waves, to be received by the built-in receiver.
Claim 9
Dependent Claim
43 words
An automobile antenna system as defined in any one of claims 1 or 7 wherein said circuit means includes impedance matching means and amplifying means wherein the output impedance of said amplifying means coincides with the characteristic impedance of a coaxial antenna cable.
References Cited (Backward Citations)
US2212253A
Cited
US2200674A
Cited
US2404093A
Cited
US2481978A
Cited
US2520986A
Cited
US2575471A
Cited
DE889618C
Cited
US2740113A
Cited
US2774811A
Cited
US3007164A
Cited
US2971191A
Cited
US2950479A
Cited
US3066293A
Cited
US2859441A
Cited
DE1131762B
Cited
US3210766A
Cited
US3364871A
Cited
DE1949828A1
Cited
US3611388A
Cited
US3728732A
Cited
DE7015306U
Cited
US3717876A
Cited
US3742508A
Cited
US3823403A
Cited
US3794997A
Cited
DE2425189A1
Cited
JPS5322418A
Cited
US3916413A
Cited
US3961330A
Cited
US3961292A
Cited
US3972048A
Cited
US4003056A
Cited
US4080603A
Cited
JPS5334826A
Cited
DE2701921A1
Cited
DE2733478A1
Cited
DE2745475A1
Cited
US4278980A
Cited
DE2821202A1
Cited
US4217591A
Cited
JPS5588407A
Cited
US4317121A
Cited
JPS56156031A
Cited
JPS56168441A
Cited
US4339827A
Cited
JPS5870640A
Cited
JPS5870642A
Cited
JPS5944861A
Cited
US4499606A
Cited
US4566133A
Cited
JPS59129464A
Cited
US4506267A
Cited
US4633519A
Cited
JPS601010A
Cited
JPS601012A
Cited
JPS601011A
Cited
JPS601009A
Cited
JPS601008A
Cited
JPS60169204A
Cited
JPS60172804A
Cited
EP0182497A1
Cited
EP0181120A2
Cited
EP0181765A1
Cited
EP0181200A2
Cited
EP0183443A1
Cited
EP0183523A2
Cited
EP0183520A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |