Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2001-12-18
2004-06-22
Wilmer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S7000MS
Reexamination Certificate
active
06753818
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a concealed antenna for mobile communication devices, and more particularly, to a concealed antenna having a novel asymmetrical structure that operates in multiple frequency bands.
BACKGROUND OF INVENTION
Mobile communication devices typically include an antenna for transmitting and/or receiving wireless communication signals. Wireless communication systems and protocols use a wide variety of frequency bands. For example, GSM (Global System for Mobile communication) is a digital mobile telephone system that typically operates at a low frequency band, such as between 880 MHz and 960 MHz. DCS (Digital Communication System) is a digital mobile telephone system that typically operates at high frequency bands between 1710 MHz and 1880 MHz. PCS (Personal Communication Services), another digital mobile telephone system, uses a band between about 1850 MHz and 1990 MHz, and GPS (Global Positioning System) uses a 1570 MHz band.
It is desirable to have the same mobile communication device working properly under these different frequencies. In order to achieve this goal, an antenna capable of transmitting and receiving signals in these frequencies has to be provided.
Concealed antennas are preferred by users of mobile communication devices, such as mobile phones, because the concealed antennas provide a compact appearance and non-intruding look.
FIG. 1
shows a conventional concealed antenna used in a mobile phone. Concealed antennas usually are realized by forming radiating elements
105
on a dielectric board
110
that is concealed in the mobile phone housing.
According to
FIG. 1
, the antenna is disposed on the upper portion of the mobile phone housing. Disposing the concealed antenna in the upper portion of the mobile phone tends to cause interference problems. Users of mobile phones often hold the mobile phone near the upper portion of the housing. Contact by the human body usually interferes the transmission/reception quality of electromagnetic signals. In addition, placing the antenna near the upper portion of the mobile phone causes health concerns. Although impact from electromagnetic waves is not clinically proven, users prefer antennas to be as far away as possible from their heads.
Therefore, there is a need for a concealed antenna for mobile communication devices. There is another need for a concealed antenna without causing signal interference. Still another need exists for placing mobile phone antennas as far away as possible from users. These and other needs are addressed by the present invention.
SUMMARY OF THE INVENTION
The invention provides a novel design for concealed antennas used with wireless communication devices. The invention is advantageous in that the antenna is disposed in a location away from a user's head. The invention is also advantageous in reducing human contact with the antenna so that signal interference is reduced. In addition, the antenna configuration of the invention provides superior signal transmission/reception quality. The invention advantageously provides an antenna configuration that does not require a wire connecting the antenna to the circuit board of a mobile communication device.
A mobile communication device according to an embodiment of the present invention comprises a housing enclosing a circuit board that has communication components disposed thereon. The housing has opposite first and second surfaces, such as inner and outer surfaces. An antenna element is formed on the first surface of the housing for receiving and/or radiating electromagnetic signals, and an inner conductive layer is disposed on the second surface of the housing. The inner conductive layer is electrically connected to the antenna element and in signal communication with the circuit board.
In one aspect, the antenna element includes first and second radiating segments. The first radiating segment includes first and second conductive strips. The first conductive strip has a substantially L shape and is disposed along first and second sides of the housing. The second conductive strip is also of substantially L shape and has one end connected to the first conductive strip near the second side of the housing and one free end extending towards the first side of the housing.
The second radiating segment also includes third and fourth conductive strips. The third conductive strip is in of substantially L shape and disposed along the first and fourth sides of the housing. The fourth conductive strip has a substantially L shape having one end connected to the third conductive strip near the fourth side of the housing and one free end extending towards the first side of the housing.
In another aspect, the first radiating segment is sized and configured to radiate in a low frequency band and the second radiating segment is sized and configured to radiate in a high frequency band.
In still another aspect, the inner conductive layer forms electrical contact with the antenna element via metalized holes. Since the inner conductive layer is in signal communication with the circuit board, the antenna element is connected to the circuit board without using wires or strip cables.
According to another embodiment of the invention, a mobile communication device comprises a housing has a front element and a back element and encloses a circuit board having communication components disposed thereon. The front element has a display, a speaker, and a plurality of keys. A concealed antenna element is formed on the back element for receiving and/or transmitting electromagnetic signals. The concealed antenna element is formed substantially only in the bottom half of the back element. Thus, users of the mobile communication device are less likely to touch the antenna during operation.
Still other advantages of the present invention will become readily apparent from the following detailed description, simply by way of illustration of the invention and not limitation. As will be realized, the invention is capable of other and different embodiments, and its several details are capable of modifications in various obvious respects, all without departing from the invention. Accordingly, the drawing and description are to be regarded as illustrative in nature, and not as restrictive.
REFERENCES:
patent: 5898404 (1999-04-01), Jou
patent: 5986609 (1999-11-01), Spall
patent: 5995052 (1999-11-01), Sadler et al.
patent: 6054954 (2000-04-01), Eggleston et al.
patent: 6061028 (2000-05-01), Sakata
patent: 6073027 (2000-06-01), Norman et al.
patent: 6094179 (2000-07-01), Davidson
patent: 6140966 (2000-10-01), Pankinaho
patent: 6204826 (2001-03-01), Rutkowski et al.
patent: 6266538 (2001-07-01), Waldron
patent: 6417817 (2002-07-01), Pirila et al.
Arima Optoelectronics Corp.
Volpe and Koenig P.C.
Wilmer Michael C.
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