Communications: radio wave antennas – Antennas – Plural separate diverse type
Reexamination Certificate
2001-09-18
2003-03-18
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Plural separate diverse type
C343S7000MS, C343S702000
Reexamination Certificate
active
06535172
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a card-shaped radio communication module which is installed to electrical apparatuses such as a personal computer, a wireless telephone, and an audio apparatus, and adds radio communication function there to, and an antenna device which is comfortably used in the card-shaped radio communication module.
2. Description of the Related Art
Recently, along with digitization of data, information such as music, speech, images and other various data can be obtained easily from a personal computer or mobile computer. Furthermore, such information is band-compressed by undergoing the speech codec technique or image codec technique, and is delivered to a variety of radio communication terminal equipment easily and efficiently by digital radio communication or digital radio broadcasting. For example, audio video data (AV data) can also be received by a wireless telephone.
On the other hand, systems for transmitting/receiving data are being utilized in household as well as various environments by the use of simplified radio communication network systems which can be employed even in a region of a small scale. As the radio communication network systems, radio communication systems for next generation such as the 5 GHz narrow-band radio communication system proposed in IEEE 802.1a, 2.45 GHz band radio LAN system proposed in IEEE 802.1b, and a short-range radio communication system termed Bluetooth are worthy of notice.
There has been proposed a personal computer system in which a card-sized radio LAN card
50
adds radio communication function to a personal computer
2
or a main apparatus
2
. The main apparatus
2
can transmit/receive data among apparatuses constituting the system when the radio LAN card
50
is installed to a slot
3
thereof, as shown in FIG.
1
. The radio LAN card
50
has a module main body
51
and an antenna unit
52
provided at one side thereof. The radio LAN card
50
has a radio communication controlling unit and a high frequency signal processing unit built therein. The radio LAN card
50
is electrically connected to the main apparatus
2
when the module main body
51
is installed to the slot
3
thereof. At this time, the antenna unit
52
is exposed to the outside to transmit/receive data among the apparatuses, as shown in FIG.
2
.
In the radio LAN system proposed in IEEE 802.1b, a radio LAN card conforming to the PCMCIA (Personal Computer Memory Card International Association) is widely utilized. On the other hand, in the Bluetooth radio communication network system, a small-sized radio LAN card having radio communication function has been developed.
When the radio LAN card
50
conforming to the PCMCIA is installed to the slot
3
of the main apparatus
2
, the antenna unit
52
protrudes from the side of the main apparatus
2
by a length
1
being approximately 25 mm, as shown in FIG.
2
. Furthermore, an external antenna, not shown, is mounted to the antenna unit
52
so as not to be prevented from transmitting/receiving data among the apparatuses by the main apparatus
2
, which undesirably makes the main apparatus
2
complicated and enlarged.
In case the main apparatus
2
is a portable apparatus such as a note type personal computer or mobile apparatus, the protruding length of the radio LAN card
50
is too large and cumbersome. So, the radio LAN card
50
is often broken when hit by the user by mistake. Furthermore, even though the radio LAN card
50
can add radio communication function to various apparatuses, the configuration shape is restricted, which undesirably raise the difficulty in designing with high degree of freedom.
There are proposed antenna apparatuses of variety of configurations, and an inversed F type antenna is used as a built-in antenna of a relatively simplified configuration. The inversed F type antenna has an antenna pattern, a short circuit forming pattern, and a feeding pattern. The short circuit forming pattern has an end thereof connected to an end of the antenna pattern perpendicular thereto, and the feeding pattern has an end thereof connected to the halfway portion of the antenna pattern in parallel with the short circuit forming pattern. Thus, the inversed F type antenna of an inversed F shape is configured. The direction of the main polarized wave of the inversed F type antenna crosses perpendicular to the antenna pattern thereof.
FIG. 3
shown a schematic view of an antenna device
60
in which a pair of inversed F type antenna patterns being a first inversed F type antenna pattern
62
and a second inversed F type antenna pattern
63
are formed perpendicular to each other. The direction of the main polarized wave of the first inversed F type antenna pattern
62
is a
1
and that of the second inversed F type antenna pattern
63
is b
1
, thereby configuring polarization diversity. Thus configured antenna-device
60
requires a height h, which makes it difficult to reduce the size thereof. So, in case the antenna device
60
is used as the antenna unit
52
, the radio LAN card
50
is undesirably enlarged.
The radio communication function is added to various apparatuses such as a digital still camera, a video camera or a portable audio apparatus as an AV apparatus, a household electrical apparatus, and an entertainment robot, as well as a radio communication apparatus and an apparatus in a computer system. Especially, with a portable apparatus, forming a plurality of communication ports or installing hardware conforming to various standards induce enlargement and high price of the apparatus, which significantly prevents the diffusion thereof. Furthermore, the radio communication function is significantly affected by interference generated at the same frequency band or at different frequency bands.
Since the radio LAN card is used in above-described various apparatuses as well as a radio communication apparatus and an apparatus in a computer system, a small-sized antenna device which does not protrude so much from a main apparatus and has polarization diversity characteristics is required extremely.
OBJECT AND SUMMARY OF THE INVENTION
It is therefore an object of the present invention to overcome the above-mentioned drawbacks by providing a small-sized antenna device which has polarization diversity characteristics.
It is another object of the present invention to provide a radio communication card module which has a small-sized antenna unit whose protruding length from a main apparatus is made minimum when installed and adding radio communication function thereto and has polarization diversity characteristics.
According to the present invention, there is provided an antenna device which has at least a first antenna pattern being an inversed F type antenna pattern and a second antenna pattern being a meander type antenna pattern formed on the main surface of a dielectric substrate by printed wiring. The inversed F type antenna pattern and the meander type antenna pattern are wired so that the directions of the main polarized wave of these antenna patterns cross perpendicular to each other. There is formed a short circuit forming pattern on the dielectric substrate between the inversed F type antenna pattern and the meander type antenna pattern. There is formed a ground pattern on the dielectric substrate in the vicinity of a feeding portion of the meander type antenna pattern. The meander type antenna pattern has a point in the vicinity of the opened end thereof connected to a circuit unit formed on the dielectric substrate or to a short circuit forming pattern formed on the dielectric substrate between the inversed F type antenna pattern and the meander type antenna pattern.
With the antenna device according to the present invention, having the inversed F type antenna pattern and the meander type antenna pattern whose directions of the main polarized wave cross perpendicular to each other, the antenna device can be reduced in size and configure polarization diversity, and whose antenna characteristics is not deteriorated wh
Frommer William S.
Frommer & Lawrence & Haug LLP
Ho Tan
Simon Darren M.
LandOfFree
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