Patch antenna and electronic equipment using the same

Details Patch antenna and electronic equipment using the same Patch antenna and electronic equipment using the same

1999-11-30

2001-07-03

Le, Hoanganh (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S846000

Reexamination Certificate

active

06255995

ABSTRACT:

BACKGROUND
1. Technical Field
This invention relates to a patch antenna that is primarily used for mobile communications or wireless local area networks (LAN), and to electronic equipment that utilizes the same.
2. Description of Related Art
As a small planar antenna for mobile communication or wireless LAN, a microstrip antenna or a patch antenna with a thickened strip has been widely used.
FIG. 6
shows an exemplary structure of such a patch antenna. In the example shown in
FIG. 6
, a patch antenna
51
comprises a dielectric plate
52
, a ground plate
53
provided on entire one surface of the dielectric plate
52
, a patch
54
provided on the other surface of the dielectric plate
52
, and a feeding line
55
provided on the other surface of the dielectric plate
52
for connection to the patch
54
. Further, a numeral
56
shows a feed point for feeding power to the feeding line
55
and ground plate
53
.
The patch antenna
51
of the aforesaid structure has an advantage that it is small and thin, hence, it does not take a large space. However, in case of using it as an antenna for mobile communication such as mobile computing or as an antenna for wireless communication for connecting a computer to a network, there have been problems in that it has not only narrow directivity due to the ground plate
53
provided on one surface of the dielectric plate
52
, but also a narrow frequency bandwidth due to a high Q value. Namely, if such a patch antenna has narrow directivity and yet narrow frequency bandwidth, it is required to direct the antenna toward its communication counterpart at the time of wireless communication, or to specify a direction of the antenna at the time of installing electronic equipment such as a computer. Apparently, these problems have rendered such a patch antenna impractical. To this end, what has been desired in the field of mobile communication or wireless LAN is to improve the conventional patch antenna such that it is substantially non-directional and yet it has a broader frequency bandwidth.
On the other hand, a technique has been proposed to provide an aperture on a patch antenna for lengthening its current path, thereby to downsize the antenna. It is also known to provide an aperture on the ground plate, thereby to feed power from a strip line to the antenna by means of electromagnetic coupling. Further, Japanese Patent Publication 10-22723 discloses a technique for forming notches on a ground electrode (ground plate) to suppress a distinctly polarized wave; Japanese Patent Publication 10-233617 discloses a technique for improving an inverted-F shaped planar antenna by making use of a ground plane with an aperture (ground plate); and Japanese Patent Publication 7-46033 discloses a technique for forming a pair of slots on a ground plane element (ground plate) to provide a two-frequency or multifrequency capability. However, even with these techniques, it has been unable to implement the non-directional and broad-bandwidth characteristics of a patch antenna.
Therefore a need exists for a patch antenna having non-directional and broad-bandwidth characteristics.
SUMMARY OF THE INVENTION
A patch antenna is described, having a ground plate provided on one surface of a dielectric plate, and further having a patch and a feeding line connected to the patch each provided on the other surface of the dielectric plate. The improvement comprising an aperture being provided on the ground plate at a position that is asymmetric about the center of the ground plate.


REFERENCES:
patent: 5798734 (1998-08-01), Ohtsuka et al.
patent: 5986615 (1999-11-01), Westfall et al.
patent: 6124830 (2000-09-01), Yuanzhu
patent: 447218A2 (1991-09-01), None
patent: 801436A2 (1997-10-01), None
patent: 924796A2 (1998-12-01), None
patent: 9260933 (1997-10-01), None
patent: WO9532528 (1995-11-01), None

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