EP0515590A1 - Isolated antenna bases - Google Patents
Isolated antenna basesInfo
- Publication number
- EP0515590A1 EP0515590A1 EP19910918891 EP91918891A EP0515590A1 EP 0515590 A1 EP0515590 A1 EP 0515590A1 EP 19910918891 EP19910918891 EP 19910918891 EP 91918891 A EP91918891 A EP 91918891A EP 0515590 A1 EP0515590 A1 EP 0515590A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- vehicle
- base
- capacitive coupling
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/1271—Supports; Mounting means for mounting on windscreens
- H01Q1/1285—Supports; Mounting means for mounting on windscreens with capacitive feeding through the windscreen
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
Definitions
- This invention is a range of antenna bases, integral to the antenna, using the same technical principle.
- the vehicle When a mobile communication antenna is fitted to a vehicle, the vehicle normally becomes a part of the antenna circuit and this part of the antenna circuit is called the groundplane.
- the antenna base is fitted by drilling a hole and the car is connected to the antenna circuit by way of the mechanical structure of the antenna base itself.
- this has presented a number of problems, two of the most significant of these are: first, that it may not be practical to drill a hole in the car - second, that if the vehicle has an insulated return electrical system and is used in the petro-chemical industry to carry volatile liquids or explosives, or it has a highly sophisticated, computerised electrical system, the connecting of the antenna earth could make it dangerous, becoming a serious fire risk or causing a malfunction in the computer with serious probable consequences.
- the present invention overcomes both of these problems, because it does not require a hole to be drilled and it does not connect the antenna earth to the vehicle directly, but capacitively.
- Figure 1 the antenna base is shown in cross-section attached to the vehicle panel or bodywork, irrespective of the location.
- the coaxial cable 8 which connects the transmitter/ receiver to the antenna is terminated within the antenna base body moulding section 4.
- the antenna earth or return which is the screened part of the cable is
- the centre 3 or hot part of the antenna cable 2 is connected to 1 where any suitable antenna can be affixed.
- the connecting of the antenna earth or braid side of the coaxial cable to plate 5 could be magnetic, providing dielectric 6 is a suitable material and the vehicle surface 9 is of a ferrous material, thus allowing a magnetic flux with 5.
- Plate 6 could be of any alternative suitable material offering itself as a capacitor plate, providing dielectric 6 is also adhesive on both sides.
- the radio signal When the radio signal is induced into the antenna base, it is connected to the antenna affixed to 1 and to the vehicle capacitively through plate 5 and dielectric 6, due to the alternating current of the radio signal, but at no time will the vehicle be directly connected to the antenna earth.
- the cable 8 will also be of sufficiently small diameter to practically run through extremities of the vehicle without causing problems, i.e. doors, boot lid, hatch back, door etc.
Landscapes
- Support Of Aerials (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Details Of Aerials (AREA)
Abstract
Base d'antenne intégrée à l'antenne et présentant un couplage capacitif avec la carrosserie ou un panneau d'un vehicule métallique ou d'un matériau de remplacement, par n'importe quel procédé approprié consistant à utiliser un diélectrique ou un matériau d'une perméabilité appropriée. L'antenne est ainsi connectée à la terre, ce qui permet à un courant alternatif de la traverser sous forme d'une radiofréquence, mais ne permet pas à un courant direct de passer, de sorte que l'antenne est isolée. Le couplage capacitif et l'isolation par rapport au courant direct sont effectués par la base elle-même, de sorte qu'aucune autre structure n'est requise entre la base et le vehicule sur lequel elle est montée.Antenna base integrated into the antenna and having a capacitive coupling with the bodywork or a panel of a metallic vehicle or of a replacement material, by any suitable method consisting in using a dielectric or a material of appropriate permeability. The antenna is thus connected to the ground, which allows an alternating current to cross it in the form of a radio frequency, but does not allow a direct current to pass, so that the antenna is isolated. Capacitive coupling and isolation from direct current are performed by the base itself, so that no other structure is required between the base and the vehicle on which it is mounted.
Description
Description
Isolated antenna bases
This invention is a range of antenna bases, integral to the antenna, using the same technical principle.
When a mobile communication antenna is fitted to a vehicle, the vehicle normally becomes a part of the antenna circuit and this part of the antenna circuit is called the groundplane.
Usually the antenna base is fitted by drilling a hole and the car is connected to the antenna circuit by way of the mechanical structure of the antenna base itself. For many years, this has presented a number of problems, two of the most significant of these are: first, that it may not be practical to drill a hole in the car - second, that if the vehicle has an insulated return electrical system and is used in the petro-chemical industry to carry volatile liquids or explosives, or it has a highly sophisticated, computerised electrical system, the connecting of the antenna earth could make it dangerous, becoming a serious fire risk or causing a malfunction in the computer with serious probable consequences.
The present invention overcomes both of these problems, because it does not require a hole to be drilled and it does not connect the antenna earth to the vehicle directly, but capacitively.
A specific embodiment of the invention will now be described by way of example with reference to the
accompanying drawing in which:-
Figure 1 the antenna base is shown in cross-section attached to the vehicle panel or bodywork, irrespective of the location.
The coaxial cable 8 which connects the transmitter/ receiver to the antenna is terminated within the antenna base body moulding section 4. The antenna earth or return which is the screened part of the cable is
terminated at 7, directly in contact with the capacitive plate 5. The centre 3 or hot part of the antenna cable 2 is connected to 1 where any suitable antenna can be affixed. The connecting of the antenna earth or braid side of the coaxial cable to plate 5 could be magnetic, providing dielectric 6 is a suitable material and the vehicle surface 9 is of a ferrous material, thus allowing a magnetic flux with 5. Plate 6 could be of any alternative suitable material offering itself as a capacitor plate, providing dielectric 6 is also adhesive on both sides.
When the radio signal is induced into the antenna base, it is connected to the antenna affixed to 1 and to the vehicle capacitively through plate 5 and dielectric 6, due to the alternating current of the radio signal, but at no time will the vehicle be directly connected to the antenna earth.
The cable 8 will also be of sufficiently small diameter to practically run through extremities of the vehicle without causing problems, i.e. doors, boot lid, hatch back, door etc.
Claims
Claim
An antenna base, integral to the antenna, which is capacitively coupled to the bodywork or panel of a metal vehicle, or any other form of metal or other substitute material groundplane, which is fastened, attached or secured via any suitable method, comprising of dielectric or material of suitable permeativity, which thus isolates it from direct current (DC), but which allows an alternating current ( AC ) to pass.
The antenna base, integral to the antenna, achieves the capacitive coupling soley through the antenna's mechanical design and is not dependent upon structures additional to the vehicle to which it is attached.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9026466A GB2250637A (en) | 1990-12-05 | 1990-12-05 | Isolated antenna bases |
| GB9026466 | 1990-12-05 | ||
| GB9113933A GB2250639A (en) | 1990-12-05 | 1991-06-26 | Isolated antenna bases |
| GB9113933 | 1991-06-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0515590A1 true EP0515590A1 (en) | 1992-12-02 |
Family
ID=26298063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19910918891 Withdrawn EP0515590A1 (en) | 1990-12-05 | 1991-10-25 | Isolated antenna bases |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0515590A1 (en) |
| AU (1) | AU8749791A (en) |
| DE (1) | DE9116508U1 (en) |
| WO (1) | WO1992010865A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4244611C2 (en) * | 1992-12-31 | 1996-02-22 | Hirschmann Richard Gmbh Co | Vehicle antenna for high frequencies |
| DE4439387C2 (en) * | 1994-11-04 | 1997-06-05 | Daimler Benz Ag | Antenna for a motor vehicle |
| GB9612826D0 (en) * | 1996-06-19 | 1996-08-21 | Ford Motor Co | Improved vehicular radio antennas |
| GB201105949D0 (en) * | 2011-04-07 | 2011-05-18 | Imagination Tech Ltd | Vehicle antenna |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4080603A (en) * | 1976-07-12 | 1978-03-21 | Howard Belmont Moody | Transmitting and receiving loop antenna with reactive loading |
| US4184160A (en) * | 1978-03-15 | 1980-01-15 | Affronti Victor A | Antenna roof mount for vehicles |
| JPS5527779A (en) * | 1978-08-19 | 1980-02-28 | Sony Corp | Car antenna |
| FR2553584B1 (en) * | 1983-10-13 | 1986-04-04 | Applic Rech Electronique | HALF-LOOP ANTENNA FOR LAND VEHICLE |
| US4658259A (en) * | 1985-03-06 | 1987-04-14 | Blaese Herbert R | On-glass antenna |
| US4764773A (en) * | 1985-07-30 | 1988-08-16 | Larsen Electronics, Inc. | Mobile antenna and through-the-glass impedance matched feed system |
-
1991
- 1991-10-25 EP EP19910918891 patent/EP0515590A1/en not_active Withdrawn
- 1991-10-25 DE DE9116508U patent/DE9116508U1/en not_active Expired - Lifetime
- 1991-10-25 AU AU87497/91A patent/AU8749791A/en not_active Abandoned
- 1991-10-25 WO PCT/GB1991/001875 patent/WO1992010865A1/en not_active Application Discontinuation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9210865A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU8749791A (en) | 1992-07-08 |
| DE9116508U1 (en) | 1992-12-24 |
| WO1992010865A1 (en) | 1992-06-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19920901 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19931118 |