Telecommunications – Transmitter and receiver at same station – Having particular housing or support of a transceiver
Patent
1996-01-11
1998-09-01
Vo, Nguyen
Telecommunications
Transmitter and receiver at same station
Having particular housing or support of a transceiver
455129, 455347, 455351, 455575, 455117, 343702, 343752, 343848, H04B 103
Patent
active
058024581
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The invention relates to devices for cordless radio communication, in particular portable cordless telephones, in addition to an antenna structure suitable for use in these devices.
BACKGROUND OF THE INVENTION
Cordless telephones, walkie-talkies, personal paging equipment (called "radio pagers" in English language professional literature) and combinations thereof are examples of devices for cordless radio communication with antennas which have to have a preferably omni-directional receiving or radiating pattern in order to realize the best possible, direction-independent reception and/or transmission of radio signals. During use, however, a part of the electromagnetic energy generated by the antenna means will also be emitted in the direction of the user.
In a device for cordless radio communication embodied for instance as portable telephone which comprises information exchanging means for picking up and reproducing audio signals, which means are accessible to a user from one side of the housing in the manner of a telephone receiver, the user will hold the telephone with said side against or close to his head. However, the electromagnetic shielding caused by the head results in an effective decrease of the electromagnetic energy generated by the antenna in the direction of the head as well as a reduced sensitivity to radio reception in this direction.
European patent application 0,532,960 discloses a portable cordless telephone provided with an extending rod antenna having an active part for receiving and transmitting radio-frequent radiation which extends mutually in line with a non-active part. During use the active part protrudes above the head of the user. In this manner an undesired influencing of the antenna properties by the body of the user is prevented as far as possible. The amount of electromagnetic energy striking against the body of the user or a part thereof is also reduced in this manner.
The Japanese patent application 4,220,851 discloses the use of electromagnetic shielding means on the side of a portable cordless telephone directed toward the user during use, this to limit as far as possible the amount of electromagnetic energy radiated in the direction of the head of the user.
SUMMARY OF THE INVENTION
The basic objective of the invention is to provide a device for cordless radio communication, wherein steps are taken aimed at reducing the influence of the body of a user, a part of the body, on the electromagnetic energy effectively transmitted and/or received by the antenna means.
The invention also has for its object to reduce the mount of electromagnetic radiation to which the body of the ser is exposed during use of a device for cordless radio communication suitable for transmitting radio signals.
A further objective of the invention is to provide a suitable antenna construction for use in a device for cordless radio communication, particularly in combination th the said steps for reducing the influence of the body of e user on the transmitting and/or receiving properties of the device.
The invention is based on the insight that it is of no practical value to design the antenna means such that during use they generate electromagnetic energy in a direction shielded by the body of the user or a part thereof and/or are sensitive to reception of radio-frequent radiation from this direction. In its most general form the invention involves providing a device for cordless radio communication provided with antenna means having an asymmetrical directional pattern which has an attenuation in the direction of the side from which the means for information exchange are accessible to the user.
In a practical realization the invention provides a device for cordless radio communication provided with a housing, means for information exchange accommodated in the housing and accessible to the user from one side thereof, signal processing means coupled to the means for information exchange and radio transmission means coupled to the signal processing means and pro
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Van Bruggen Johannis
Van Zeijl Paulus Thomas M.
Sobutka Philip J.
Telefoanktiebolaget LM Ericsson
Vo Nguyen
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