Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2001-12-10
2003-07-15
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S702000
Reexamination Certificate
active
06593888
ABSTRACT:
FIELD OF THE INVENTION
The present invention is related to an inverted-F antenna, and more particularly to an inverted-F antenna utilized in the wireless signal communication domain.
BACKGROUND OF THE INVENTION
The applications of wireless communication are very general in daily life, for example the wireless mobile phones, the wireless modems and the wireless network cards. The wireless devices utilize the RF (Radio Frequency) technique to meet the target of the communication between two clients in real-time. However, the antenna is an important component in the mechanical design of wireless signal transmission.
An antenna is always designed as a metal line or a planar surface having suitable shape for the wavelength of wireless signal. How to improve the inverted-F antenna for avoiding the weak point is the main topic of the present invention.
FIG. 1
shows shape structure of the conventional inverted-F antenna. This kind of inverted-F antenna has the obvious advantage in frequency bandwidth compared to the general antenna, bnt it is difficult to manufacture due to the structure. The inverted-F antenna consists of four planes
11
,
12
,
13
,
14
and a pillar
15
observing from the shape. The first plane
11
vertically connects to the second plane
12
; the second plane
12
vertically connects to the third plane
13
; and the third plane
13
vertically connects to the fourth plane
14
. There is a distance d
1
between the fourth plane
14
and the first plane
11
. The pillar
1
5
connects to the fourth plane
14
and projects into the second plane
12
. That is, one side of the pillar
15
is conductive electrically to the fourth plane
14
and the other side is isolated from the second plane
12
. The manufacture of the pillar
15
is complicated. One side of the pillar
15
must First be soldered on the fourth plane
14
and then another side must coat an isolated material from the second plane
12
, so the manufacture cost is quite expensive.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an inverted-F antenna having a new shape for simplifying the manufacture steps.
Another object of the present invention is to provide an inverted-F antenna for reducing the cost, but the original properties of inverted-F antenna are reserved.
According to the present invention, an inverted-F antenna comprises a first plane; a second plane connecting to the first plane and having a gap; a third plane connecting to the second plane on an opposite side of the first plane; a fourth plane connecting to the third plane and having a distance from the first plane on an opposite side of the second plane; and a pillar connecting to a margin of the fourth plane and projecting to the gap of the second plane for forming the inverted-F antenna.
In accordance with one aspect of the present invention, the inverted-F antenna is made of a metal.
In accordance with one aspect of the present invention, the metal is a phosphor bronze.
In accordance with one aspect of the present invention, the gap is of “
” shape.
In accordance with one aspect of the present invention, the first plane is parallel to the third plane; the second plane is parallel to the fourth plane; the first plane is vertical to the second plane; and the third plane is vertical to the fourth plane.
In accordance with one aspect of the present invention, the pillar is vertical to the fourth plane and the second plane.
In accordance with one aspect of the present invention, the inverted-F antenna is connected to a printed circuit board.
In accordance with one aspect of the present invention, the printed circuit board has two of the inverted-F antennas.
In accordance with one aspect of the present invention, the inverted-F antenna is formed in a body.
According to the present invention, a method for forming an inverted-F antenna comprising steps of providing a prototype of the inverted-F antenna; and forming the inverted-F antenna from the prototype in a method of forming in a body.
In accordance with one aspect of the present invention, the inverted-F antenna comprises a first plane; a second plane connecting to the first plane and having a gap; a third plane connecting to the second plane on an opposite side of the first plane; a fourth plane connecting to the third plane and having a distance from the first plane on an opposite side of the second plane; and a pillar connecting to a margin of the fourth plane and projecting to the gap of the second plane for forming the inverted-F antenna.
The present invention may best be understood through the following description with reference to the accompanying drawings, in which:
REFERENCES:
patent: 4791423 (1988-12-01), Yokoyama et al.
patent: 5781158 (1998-07-01), Ko et al.
patent: 6008762 (1999-12-01), Nghiem
patent: 6114996 (2000-09-01), Nghiem
patent: 6297776 (2001-10-01), Pankinaho
patent: 6380903 (2002-04-01), Hayes et al.
patent: 6456243 (2002-09-01), Poilasne et al.
Bacon & Thomas PLLC
Ho Tan
Z-Com Inc.
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