Antenna

Details Antenna Antenna

1998-07-22

2001-02-20

Wong, Don (Department: 2821)

Communications: radio wave antennas

Antennas

With vehicle

C343S715000

Reexamination Certificate

active

06191745

ABSTRACT:

To obtain good function of a radio transmitter or receiver it is necessary that the antenna function is good, i.e. that the apparatus has a good ability to receive signals and likewise a good ability to send out signals. There are many different designs of antennas, all of them having their own characteristics regarding efficiency, direction of effect, size, complexity, cost etc.
Especially for hand-held, so called mobile telephones, the size and handling aspects are essential. When a mobile telephone is used inside an automobile, the car body steel plate acts as a shield and reflector for the radio waves, with the result that the transmitting and receiving conditions inside an automobile often are poor. Mobile telephones in cars are therefore often used with an outer antenna which is placed on the outside of the car body steel plate. This results in better transmitting and receiving conditions.
This however is achieved at the cost of increased complexity and reduced comfort. One has to mount such an outside antenna, thereby often causing damage. When one wants to use one's mobile telephone one then has to connect it by means of a cable.
That an antenna has to be connected to its radio to be able to function may seem inevitable. However, many antennas are composed of many parts, all of which are not directly connected to the radio by means of a cable or other conductor. A common type of antenna used with television receivers is the so called YAGI-antenna where only one of many elements of the antenna is connected by means of a cable. The other elements thus are not directly connected by means of conductors but are nontheless important for the function of the antenna. They are made from electrically conductive material and made in such a way that they can reflect radio waves, and also through resonance phenomena oscillate with the radio waves and thus enhance the effect of the connected element.
The present invention concerns a way of utilising such non connected antenna elements in conjunction with the ordinary antenna of a mobile telephone to form an antenna system that enhances the transmitting and receiving properties inside an automobile.


REFERENCES:
patent: 3634864 (1972-01-01), Trachtenberg
patent: 5083135 (1992-01-01), Nagy et al.
patent: 5099252 (1992-03-01), Bryant et al.
patent: 5155494 (1992-10-01), Bryant et al.
patent: 5596316 (1997-01-01), Honeck
patent: 5633645 (1997-05-01), Day
patent: 0137391 (1984-09-01), None

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