Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1997-09-22
2000-04-25
Wong, Don
Communications: radio wave antennas
Antennas
With radio cabinet
343700MS, 343895, 343900, H01Q 930
Patent
active
060549572
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to an antenna means for a radio device provided with a radio transfer or radio communication facility. An antenna means of this kind is defined in the first part of claim 1. Specifically, the invention relates to an antenna means for a device that is mobile or portable. More specifically, the invention relates to an antenna means for a personal (cellular) telephone having a small internal depth for receiving the antenna means. Such a telephone may be a terminal in, e.g., a GSM, an AMPS, or a JDC cellular telephone system.
In a radio device, such as a personal telephone, it is advantageous to achieve an antenna means that has an effective radiation distribution and a high degree of efficiency. These parameters of the antenna means effect its ability to transfer electro-magnetic radiation energy between the radio device, being a first terminal, and a radio communication means. The radio communication means may be a second terminal or a base station, e.g., in any of the above-mentioned cellular telephone systems, with the capacity of establishing a communication connection between the telephone and a second terminal.
The telephone may function in different operating modes. Two different operating modes are a stand-by mode and a call (talk) mode. In these two operating modes there may be different demands upon the antenna means. For example, if the telephone is carried in the stand-by mode, the carrier (a person) may require a small-size and compact configuration of the telephone. An antenna means configuration extending outward from the telephone may be inconvenient in this case.
The reception and transmission performance of an antenna means depends not only on the antenna means itself, but also on a radiation path between the telephone and the radio communication means. Obstacles in the radiation path will lower the antenna performance. In personal telephones it is important that the body of the user does not excessively obstruct the radiation path. Therefore, an antenna means extending sufficiently from the housing of the telephone is required. Demands for performance are higher in the call mode.
PRIOR ART
A type of antenna means that has been used on personal telephones to provide satisfactory performance is disclosed in, e.g., U.S. Pat. No. 4,868,576, WO 94/10720, and WO 94/28593. These antenna means use a helical antenna mounted on a housing of a telephone. Movably through the helical antenna there is provided an elongated radiator that is extendable to increase antenna performance when needed. The disclosed antenna means use extendable antennas with a non-conductive top portion. This requires that the telephones are able to receive all of a radiating portion of the elongated radiator in its retracted position. This creates problems in modern small-size telephones. The above-mentioned documents are incorporated by reference.
OBJECTS AND SUMMARY OF THE INVENTION
The invention is particularly directed toward providing an antenna means that overcomes the deficiencies of the above-mentioned prior art antenna means when an elongated radiator thereof is in a retracted position.
Thus, an object of the invention is to provide a small-size antenna means for a small-size radio communication device. It is desirable to provide an antenna means that is short in overall length compared to the total length of radiator elements combined in the antenna means (at given electrical radiator lengths).
Another object of the invention is to provide an antenna means that occupies a small space inside the radio communication device. For example, as the length of a portable telephone housing is reduced there is a demand for an antenna means with less length inside the housing.
Another object of the invention is to provide an antenna means maintaining high efficiency in order to keep up operating range of a radio communication device and, if the radio communication device is output power controlled, to reduce output power in transmitting from the radio communicatio
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patent: 5343213 (1994-08-01), Kottke et al.
patent: 5600341 (1997-02-01), Thill et al.
patent: 5717408 (1998-02-01), Sullivan et al.
patent: 5764191 (1998-06-01), Tsuda
Lofgren Stefan
Saldell Ulf
Allgon AB
Clinger James
Wong Don
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