Telecommunications – Transmitter and receiver at same station – Having particular housing or support of a transceiver
Reexamination Certificate
1999-02-09
2002-06-04
Le, Thanh Cong (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Having particular housing or support of a transceiver
C455S095000, C455S097000, C455S128000, C455S129000, C455S557000, C455S558000, C455S575100
Reexamination Certificate
active
06400931
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a card-like wireless communication device as set forth in the preamble of claim
1
. The invention relates also to a method in the manufacture of a card-like wireless communication device as set forth in the preamble of claim
8
.
2. Description of the Prior Art
In wireless communication devices, such as mobile stations, antennas used for the transmission and receiving of radio-frequency signals include, in a known manner, a monopoly antenna and a helix antenna. The radio-frequency signals are transmitted between the radio part and the antenna of the wireless communication device usually by means of conductors and connectors.
The monopole antenna is, in principle, a straight conductor which is placed substantially perpendicularly above the conducting level and whose length depends e.g. on the frequency range of the radio-frequency signal used at the time. For example in mobile stations, the monopoly antenna is implemented, in a manner known as such, as pulled-out antenna structure so that an antenna conductor or the like, placed inside the frame of the mobile station, can be pulled out from the mobile station for the time of a call. Pulled to its extreme position, the antenna conductor is locked in position and simultaneously coupled electrically to be ready to use with the radio part of the mobile station. After the call, the antenna conductor is usually inserted back in the housing of the mobile station.
The helix antenna is a conductor with a right-hand or a left-hand helix which is placed on top of the conducting level. Using the helix antenna, the antenna is made shorter than the monopoly antenna when operating in the same frequency range. In mobile stations, the helix antenna is implemented in a known manner so that the antenna conductor is placed inside a cylindrical or conical antenna structure used as a shield which is further fixed to the mobile station, usually placed at least partly outside the same. Also this structure, being placed outside the mobile station, is liable to damage.
For the operation of the antenna, it is advantageous that the antenna is placed in a free space outside a mobile station or a corresponding device. Thus, the antenna is placed farther from components of the device which may cause radio interference, such as integrated circuits (IC) and radio frequency (RF) circuits, and the structures of the device do not interfere with the radiation pattern of the antenna, whereby reception of radio-frequency signals is more reliable, particularly in a weak signal field.
Further, portfolio-type portable computers are known which comprise the necessary radio elements and an antenna for data transmission in a wireless manner via a radio connection. These wireless communication devices apply, in a known manner, the above-described pulled-out monopoly antenna and an antenna structure which is placed e.g. in connection with a display placed in the cover part. Also, a portfolio-type portable computer is known where the antenna structure comprises a helix antenna which is placed at the end of an arm construction and which can be placed totally shielded inside the device. When at least partly pulled out, the helix antenna can be made as far as possible from those elements of the device which cause radio interference.
A drawback with the above-mentioned devices is the fact that the antenna structure or the end of the antenna must be gripped for pulling out the antenna from the device, whereby the antenna must be arranged at least partly protruding from the device. A particular drawback is thus the fact that the protruding part of the antenna can be attached to something particularly during transportation of the device, damaging the antenna. For placing the antenna fully shielded inside the device, the device itself must be equipped with extra recesses or holes so that the antenna structure could first be moved a bit out of the device, after which the antenna can be gripped more easily for pulling it out. Such an operation for pulling out the antenna is, however, slow and laborious.
According to prior art, for example portfolio-type portable personal computers (PC) are often equipped with an expansion card connection to which a standard expansion card can be connected. These expansion cards have the size and shape of almost a credit card and are intended to constitute a functional unit with the PC. Known expansion cards include memory cards (RAM and ROM cards), modem cards and different input/output (I/O) cards as well as fixed disk cards. The expansion cards can also contain the radio parts of a wireless communication device, including an antenna, whereby the PC can communicate by means of this card-like wireless communication device with other devices or a communication network, such as a GSM network (Global System for Mobile Communication).
One known expansion card is the PC card complying with the PCMCIA standard (Personal Computer Memory Card International Association). The PCMCIA standard defines also the physical size of the PC card, whereby the length of the PC card is 85.6 mm and the width is 54 mm. PC cards are further divided into three types, whereby the thickness of the PC card can be 3.3 mm (type I), 5.0 mm (type II) or 10.5 mm (type III). PC cards are designed to be inserted wholly inside a PC, but so-called extended PC cards are placed partly outside the PC, whereby the thickness and design of the PC cards can vary in this part placed outside the PC. This part can also be provided with the antenna of a wireless communication device.
One known card-like wireless communication device comprising a transceiver with its antenna is the Nokia Cellular Card Phone that can be connected with expansion card connections of PC card types II and III of the PCMCIA standard. The card phone (CP) of prior art is presented in the patent application EP 0 783 236 A1. Said card phone (CP) can comply e.g. with the GSM standard, whereby the PC device to which the card phone (CP) is connected, can be in wireless communication with base stations of the Public Land Mobile Network (PLMN) by means of radio waves. In the card phone, the antenna part containing the antenna is placed in that part of the card phone (CP) which is outside the PC device, and the antenna part is integrated in the card-like part of the card phone (CP) which is placed inside the expansion card connection. One embodiment of the card phone (CP) of prior art is shown in FIG.
5
.
Card-like wireless communication devices can be detached from the expansion card connection of the PC device, whereby the protruding parts of the PC card cannot be attached to anything during transportation of the PC device, whereby the PC card or its antenna part could be damaged or broken. For pulling out the card phone (CP) from the expansion card connection, the protruding part of the PC card or the antenna part is gripped. A disadvantage with such devices is, however, just the fact that the card-like wireless communication device must be removed from the PC device for transportation, whereby making the device ready to use may require inserting the wireless communication device back in its place.
SUMMARY OF THE INVENTION
The purpose of the present invention is to eliminate the above-mentioned drawback and to present a considerable improvement to the prior art by means of a wireless communication device according to the invention. The wireless communication device of the invention is characterised in what is presented in the characterising part of claim
1
. The method for manufacturing a card-like wireless communication device according to the invention is characterised in what is presented in the characterising part of claim
8
.
The card-like wireless communication device of the invention, such as a card phone (CP), has the significant advantage that by designing the card to correspond with the dimensions of a PCMCIA card and by placing the antenna part transversely at the end of the card, the whole card-like wireless communication devic
Herranen Timo
Inkinen Sami
Cong Le Thanh
Nokia Mobile Phones Limited
Zeudu Meless
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