Communications: radio wave antennas – Antennas – Slot type
Reexamination Certificate
2001-12-18
2003-08-12
Phan, Tho G. (Department: 2821)
Communications: radio wave antennas
Antennas
Slot type
C343S7000MS
Reexamination Certificate
active
06606071
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to a multifrequency antenna, and more particularly, to a multifrequency antenna containing a slot-type conductor and a strip-shaped conductor.
2. Description of the Prior Art
Recently, the demand for antennas in mobile wireless applications has increased dramatically. In order to increase the use and versatility of antennas, there is a need for a single antenna operable in two or more separate frequency bands. In addition, antennas need to have a small size in order to meet the size requirements of today's wireless devices.
U.S. Pat. No. 6,195,048 discloses a multifrequency planar inverted F antenna (PIFA).
FIG. 1
is a perspective view of a prior art multifrequency planar inverted F antenna
10
disclosed in U.S. Pat. No. 6,195,048. For transmitting and receiving radio signals, the antenna
10
includes an emission conductor
12
. The emission conductor
12
comprises a first emission conductor
17
and a second emission conductor
18
that resonate in respectively different frequency bands. The first emission conductor
17
and the second emission conductor
18
are separated by a cutout part
12
b
in the emission conductor
12
. With this construction, the antenna
10
is capable of receiving radio waves of two different frequency bands: a first frequency band determined by the shape of first emission conductor
17
and a second frequency band determined by the shape of second emission conductor
18
.
As shown, the first emission conductor
17
has a resonance length LA and the second emission conductor
18
has a resonance length LB. One end of the emission conductor
12
is connected to a ground conductor
11
through a short-circuit plate
13
. Power is supplied to a single feeding point
12
a
of the emission conductor
12
by a coaxial feeding line
14
from power feeding source
15
. The coaxial feeding line
14
is connected through a hole
11
a
provided in ground conductor
11
.
With this construction, the antenna
10
resonates in a first frequency band corresponding to length LA of the first emission conductor
17
. LA is approximately equal to lambda
1
/
4
, where lambda
1
is the wavelength of the first frequency. The antenna
10
also resonates in a second frequency band corresponding to length LB of the second emission conductor
18
. LB is approximately equal to lambda
2
/
4
, where lambda
2
is the wavelength of the second frequency. As a result of using the first emission conductor
17
and the second emission conductor
18
, the antenna
10
is capable of receiving radio waves of two frequency bands.
However, the prior art antenna
10
uses the short-circuit plate
13
to connect one end of the emission conductor
12
to the ground conductor
11
. The use of the short-circuit plate
13
adds extra height, and therefore extra volume, to the antenna
10
.
SUMMARY OF INVENTON
It is therefore a primary objective of the claimed invention to provide a multifrequency antenna with a slot-type conductor and a strip-shaped conductor to solve the above-mentioned problems.
According to the claimed invention, the antenna comprises a metallic plate having a slot. The slot is used to transmit and receive radio signals of a first frequency band. The antenna further comprises a metallic strip connected to the metallic plate for transmitting and receiving radio signals of a second frequency band.
It is an advantage of the claimed invention that the antenna uses both the slot and the metallic strip in order to provide a multifrequency antenna with a smaller height in order to overcome the prior art shortcomings.
These and other objectives of the claimed invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
REFERENCES:
patent: 5754143 (1998-05-01), Warnagiris et al.
patent: 6031503 (2000-02-01), Preiss et al.
patent: 6339400 (2002-01-01), Flint et al.
patent: 6373442 (2002-04-01), Thomas et al.
patent: 6407715 (2002-06-01), Chen
patent: 6414642 (2002-07-01), Honda et al.
Cheng Wei-Li
Fang Chien-Hsing
Hsu Winston
Phan Tho G.
Wistron NeWeb Corporation
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