GB2250639A - Isolated antenna bases - Google Patents

Isolated antenna bases Download PDF

Info

Publication number
GB2250639A
GB2250639A GB9113933A GB9113933A GB2250639A GB 2250639 A GB2250639 A GB 2250639A GB 9113933 A GB9113933 A GB 9113933A GB 9113933 A GB9113933 A GB 9113933A GB 2250639 A GB2250639 A GB 2250639A
Authority
GB
United Kingdom
Prior art keywords
antenna
vehicle
base
metal
pass
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Withdrawn
Application number
GB9113933A
Other versions
GB9113933D0 (en
Inventor
Leslie James Wallen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB9113933D0 publication Critical patent/GB9113933D0/en
Priority to DE9116508U priority Critical patent/DE9116508U1/de
Priority to AU87497/91A priority patent/AU8749791A/en
Priority to EP19910918891 priority patent/EP0515590A1/en
Priority to PCT/GB1991/001875 priority patent/WO1992010865A1/en
Publication of GB2250639A publication Critical patent/GB2250639A/en
Withdrawn legal-status Critical Current

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

Landscapes

  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

An antenna base 4, integral to the antenna, which is capacitively coupled to the bodywork or panel of a metal vehicle, or any other form of metal or substitute material groundplane 9, by any appropriate method comprising of a dielectric 6 or material of suitable permeativity. The antenna is thereby connected to ground enabling alternating current to pass in the form of radio frequency, but not allowing direct current to pass and thus isolating it. The capacitive coupling and d.c. isolation is achieved by the antenna base 4 itself so that no other structure is required between the base and the vehicle to which it is attached. The antenna earth or braid side of a coaxial cable 8 is connected to a plate 5, which could be magnetic, and is capacitively coupled to the vehicle surface 9 via dielectric 6. The cable 8 is run through extremities of the vehicle, such as, doors, boot lid, hatch back door etc. <IMAGE>

Description

-'22.)3o39
Description
Isolated antenna bases 1 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.
2 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.
3

Claims (1)

  1. 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, comprisi.ng 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.
GB9113933A 1990-12-05 1991-06-26 Isolated antenna bases Withdrawn GB2250639A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE9116508U DE9116508U1 (en) 1990-12-05 1991-10-25
AU87497/91A AU8749791A (en) 1990-12-05 1991-10-25 Isolated antenna bases
EP19910918891 EP0515590A1 (en) 1990-12-05 1991-10-25 Isolated antenna bases
PCT/GB1991/001875 WO1992010865A1 (en) 1990-12-05 1991-10-25 Isolated antenna bases

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9026466A GB2250637A (en) 1990-12-05 1990-12-05 Isolated antenna bases

Publications (2)

Publication Number Publication Date
GB9113933D0 GB9113933D0 (en) 1991-08-14
GB2250639A true GB2250639A (en) 1992-06-10

Family

ID=10686532

Family Applications (2)

Application Number Title Priority Date Filing Date
GB9026466A Withdrawn GB2250637A (en) 1990-12-05 1990-12-05 Isolated antenna bases
GB9113933A Withdrawn GB2250639A (en) 1990-12-05 1991-06-26 Isolated antenna bases

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB9026466A Withdrawn GB2250637A (en) 1990-12-05 1990-12-05 Isolated antenna bases

Country Status (1)

Country Link
GB (2) GB2250637A (en)

Citations (4)

* Cited by examiner, † Cited by third party
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
US4115779A (en) * 1976-05-14 1978-09-19 Instrumentation Specialties Company Automobile trunk antenna mount
US4184160A (en) * 1978-03-15 1980-01-15 Affronti Victor A Antenna roof mount for vehicles
US4329689A (en) * 1978-10-10 1982-05-11 The Boeing Company Microstrip antenna structure having stacked microstrip elements

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1223339A (en) * 1983-09-23 1987-06-23 James Hadzoglou Cellular mobile communications antenna
DK525485A (en) * 1984-11-15 1986-05-16 Toyota Motor Co Ltd AUTO ANTENNA SYSTEM
US4658259A (en) * 1985-03-06 1987-04-14 Blaese Herbert R On-glass antenna
US4829309A (en) * 1986-08-14 1989-05-09 Matsushita Electric Works, Ltd. Planar antenna
US4785305A (en) * 1987-04-20 1988-11-15 Don Shyu Glass-mountable antenna assembly with microstrip filter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115779A (en) * 1976-05-14 1978-09-19 Instrumentation Specialties Company Automobile trunk antenna mount
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
US4329689A (en) * 1978-10-10 1982-05-11 The Boeing Company Microstrip antenna structure having stacked microstrip elements

Also Published As

Publication number Publication date
GB9113933D0 (en) 1991-08-14
GB2250637A (en) 1992-06-10
GB9026466D0 (en) 1991-01-23

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)