Inverted-F dipole antenna

Details Inverted-F dipole antenna Inverted-F dipole antenna

2001-03-27

2002-11-12

Wong, Don (Department: 2821)

Communications: radio wave antennas

Antennas

Microstrip

C343S702000

Reexamination Certificate

active

06480156

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an antenna, and particularly to an inverted-F dipole antenna mounted in an electronic device and operating in the ISM (Industry, Science, Medicine) frequency band for communicating with various electronic devices.
BACKGROUND OF THE INVENTION
FIG. 7
illustrates a conventional planar inverted-F antenna (PIFA). The PIFA
10
includes a ground plane
12
, an L
P
×W
P
rectangular radiating patch
14
and a short-circuit plate
16
having a width d
1
which is narrower than the width W
p
of the radiating patch
14
. The short-circuit plate
16
shorts the radiating patch
14
to the ground plane
12
along a null of the TM
100
dominant mode electric field of the radiating patch
14
. The PIFA
10
may thus be considered a rectangular microstrip antenna in which the length of the rectangular radiating patch
14
is reduced by half by the connection of the short-circuit plate
16
at the TM
100
dominant mode null. The short-circuit plate
16
supports the radiating patch
14
at a distance d
2
above the ground plane
12
. The radiating patch
14
is fed by a TEM transmission line
18
from the back of the ground plane
12
, at a point located a distance d
3
from the short-circuit plate
16
. The transmission line
18
has a width d
4
and includes an inner conductor
20
surrounded by an outer conductor
22
. The PIFA
10
is suited for use in personal base stations, handsets and other wireless communication terminals because it has a large bandwidth and can be implemented using an air dielectric as shown in FIG.
7
.
However, in this design, the inner conductor
20
of the TEM transmission line
18
penetrates through the ground plane
12
and connects with the radiating patch
14
and the outer conductor
22
connects with the ground plane
12
. This design makes the assembly more complicated and increases the cost of the antenna. Furthermore, the antenna occupies a large space, so it goes against the trend toward miniaturization of electronic devices.
The present invention is directed to solving the above problems and satisfying the need for a simple antenna of the character described.
BRIEF SUMMARY OF THE INVENTION
A primary object, therefore, of the present invention is to provide an improved antenna which occupies a small space and has a simplified manufacture.
In order to achieve the objects set forth, an inverted-F dipole antenna in accordance with the present invention comprises an antenna body, an antenna base, a connector providing an electrical interface to an RF circuitry and a cable connecting the antenna body with the connector. The antenna body includes two metal arms and a bended wire connecting the two arms. The antenna base includes a rectangular insulative board and a metal sheet attached to one surface of the board. The antenna body is mounted on the antenna base with the bended wire thereof being attached to a second surface of the board opposite to the metal sheet. The cable serves as a RF feeder and one of the metal arms serves as a radiation device.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


REFERENCES:
patent: 2929063 (1960-03-01), Lynn, Jr.
patent: 3683376 (1972-08-01), Pronovost
patent: 5793336 (1998-08-01), Shoemaker et al.
patent: 5966098 (1999-10-01), Qi et al.

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