Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
1999-11-15
2001-02-27
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S702000, C343S725000, C343S901000
Reexamination Certificate
active
06195050
ABSTRACT:
This application claims priority to an application entitled “Automatic Antenna Device for Multiband Mobile Communication Terminal” filed in the Korean Industrial Property Office on Nov. 14, 1998 and assigned Serial No. 98-48950, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a multiband mobile communication terminal, and in particular, to an automatic antenna device and method for automatically controlling an extended length of a whip antenna according to frequency bands.
2. Description of the Related Art
With the rapid development of mobile communication technology, various communication services are presently provided that use different communication systems and standards. At present, these services are not compatible with one another. Therefore, it is necessary to allow an existing mobile communication system to work with another mobile communication system. For example, have an existing CDMA (Code Division Multiple Access) terminal with a PCS (Personal Communication System) terminal; an existing AMPS (Advanced Mobile Phone Service) terminal with an US (United States) PCS terminal; and an existing GSM (Group Special Mobile) terminal with a DECT (Digital European Cordless Telephone) terminal or a DCS-1800 (Digital Communication System-1800) terminal which is a GSM terminal applied to a 1,800 MHz band. In addition, it is also necessary to allow more than three different communication systems to work with one another. A mobile communication terminal which can operate simultaneously with two or more communication systems is called a dualband or multiband mobile communication terminal. Conventionally, the multiband mobile communication terminal has an antenna device comprised of multiple antennas according to the frequency bands received. This results in an increase in the size and the cost of the terminal. Alternatively, the conventional multiband mobile communication terminal having a single antenna includes an antenna matching circuit to support the multiple frequency bands. This results in an increase in complexity.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide an automatic antenna device for a multiband mobile communication terminal, which includes an automatic antenna extending device for automatically controlling the extension of a whip antenna according to the frequency bands received.
To achieve the above object, there is provided an automatic antenna for a multiband mobile communication terminal. The automatic antenna contains a microstrip antenna mounted on an upper part of a housing of the mobile communication terminal. The microstrip antenna has at least two microstrip line parts for receiving different frequency signals. In addition, a motor with a toothed wheel mounted on a shaft thereof extends or retracts a whip antenna having corresponding sawteeth formed on a side thereof. A feeder is electrically connected to a main board of the mobile communication terminal and the microstrip antenna. The feeder is similarly electrically connected to the whip antenna by a coupling effect. An insulating tube inside which the whip antenna moves is provided for preventing antenna radiation of the whip antenna from causing interference. An antenna support is provided for supporting the whip antenna.
REFERENCES:
patent: 5212725 (1993-05-01), Yamamoto et al.
patent: 5760744 (1998-06-01), Sauer
Dilworth & Barrese LLP
Samsung Electronics Co,. Ltd.
Wimer Michael C.
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