Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-12-16
2001-12-04
Trost, William (Department: 2683)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S090300, C455S128000, C455S129000, C455S347000, C455S121000, C379S428010, C379S433010, C343S702000
Reexamination Certificate
active
06327485
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to mobile phones, and more particularly to folding mobile phones having an incorporated antenna.
2. Description of the Related Art
The design of antennas for mobile phones capable of operation in more than one frequency band (dual mode or tri-mode) is constrained by the market demand continually to reduce die overall size of mobile phones. Preference by many customers for external metallic finishes on the mobile phone housings can also increase the difficulty of antenna design.
The volume occupied by the antenna and associated circuitry and their costs are important factors for a satisfactory design as well as antenna effectiveness over a sufficiently wide operating bandwidth. Preferably the antenna will be incorporated into the mobile phone so that it is not noticeable by the user.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a folding mobile phone capable of realizing both miniaturization and antenna effectiveness over a sufficiently wide operating bandwidth.
According to the present invention there is provided a folding mobile phone including a first and second housings connected by a hinge mechanism each other, and the folding mobile phone comprising, a first conductive film incorporated with the first housing, and a second conductive film incorporated with the second housing, when the first and second housings are in a open position constituting a monopole antenna together with the first conductive film, and when the first and second housings are in a closed position acting as a ground plane.
In the present invention, a first conductive film is incorporated with the first housing, and a second conductive film is incorporated with the second housing, and when the mobile phone is in an open position a monopole antenna is constituted by the first and second conductive films, when the mobile phone is in a closed position the second conductive film acts as a ground plane. Therefore, miniaturization and antenna effectiveness over a sufficiently wide operating bandwidth are both realized.
The above and other objects, features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings which illustrate examples of the present invention.
REFERENCES:
patent: 4992799 (1991-02-01), Garay
patent: 5337061 (1994-08-01), Pye et al.
patent: 5542106 (1996-07-01), Krenz et al.
patent: 5561437 (1996-10-01), Phillips et al.
patent: 5608413 (1997-03-01), Macdonald
patent: 5752204 (1998-05-01), Epperson et al.
Ferguson Keith
NEC Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
Trost William
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