U.S. patent application number 11/613260 was filed with the patent office on 2008-06-26 for multi-band antenna.
This patent application is currently assigned to CHENG UEI PRECISION INDUSTRY CO., LTD.. Invention is credited to Ching-Chi Lin, Kai Shih, Yu-Yuan Wu.
Application Number | 20080150807 11/613260 |
Document ID | / |
Family ID | 39466496 |
Filed Date | 2008-06-26 |
United States Patent
Application |
20080150807 |
Kind Code |
A1 |
Lin; Ching-Chi ; et
al. |
June 26, 2008 |
MULTI-BAND ANTENNA
Abstract
A multi-band antenna configured in a portable electrical device
capable of operating in a low frequency bandwidth and a high
frequency bandwidth has an elongated radiating body and a feeding
conductor connecting the elongated radiating body. The feeding
conductor has opposite side arms respectively connecting the
elongated radiating body and a connecting portion connecting the
side arms. A feeding point is arranged at a corner where one of the
side arms connects to the connecting portion. The elongated
radiating body and the feeding conductor are located on different
planes of the portable electronic device. According to the position
where the feeding conductor connects to the elongated radiating
body and the position where the feeding point is arranged at, the
multi-band antenna has a preferred low frequency bandwidth and a
preferred high frequency bandwidth. Therefore, the portable
electrical device can operate at different wireless bandwidths.
Inventors: |
Lin; Ching-Chi; (Taipei
Hsien, TW) ; Shih; Kai; (Taipei Hsien, TW) ;
Wu; Yu-Yuan; (Taipei Hsien, TW) |
Correspondence
Address: |
WPAT, PC;INTELLECTUAL PROPERTY ATTORNEYS
2030 MAIN STREET, SUITE 1300
IRVINE
CA
92614
US
|
Assignee: |
CHENG UEI PRECISION INDUSTRY CO.,
LTD.
Taipei Hsien
TW
|
Family ID: |
39466496 |
Appl. No.: |
11/613260 |
Filed: |
December 20, 2006 |
Current U.S.
Class: |
343/702 ;
343/700MS |
Current CPC
Class: |
G06F 1/1698 20130101;
G06F 1/1616 20130101; H01Q 1/243 20130101; H01Q 5/371 20150115;
H01Q 5/335 20150115; H01Q 1/38 20130101; H01Q 1/2266 20130101 |
Class at
Publication: |
343/702 ;
343/700.MS |
International
Class: |
H01Q 9/04 20060101
H01Q009/04; H01Q 1/24 20060101 H01Q001/24; H01Q 1/38 20060101
H01Q001/38 |
Claims
1. A multi-band antenna comprising: an antenna body having a first
radiating branch having opposite elongated edges, a second
radiating branch extending from one end of said first radiating
branch, a third radiating branch extending from the other end of
said first radiating branch and perpendicular to said first
radiating branch, said second and third radiating branches
projecting to the same direction; a feeding conductor substantially
formed U-shape and connecting to said antenna body, said feeding
conductor and said second radiating branch projecting to opposite
directions, said feeding conductor extending from an area where
said first radiating branch connecting said second radiating
branch; and a feeding point arranged at a corner of said feeding
conductor.
2. The multi-band antenna as claimed in claim 1, wherein the length
of said first radiating branch is longer than the length of said
second radiating branch, the width of said first radiating branch
is narrower than the width of said second radiating branch, the
length of said third radiating branch is shorter than said length
of said first radiating branch, the width of third radiating branch
is wider than said width of said first radiating branch.
3. The multi-band antenna as claimed in claim 1, wherein said
feeding conductor has a first side arm, a second side arm which is
opposite to said first side arm, and a connecting portion, said
first and second side arms respectively have an inner edge facing
each other and an outer edge opposite to said inner edge, one end
of said first and second side arms respectively connects to said
second radiating branch and the other end of said first and said
second side arms respectively connects to both ends of said
connecting portion, said outer edge of said first side arm is at
the same level with said area, said feeding point is arranged at
said corner where said first side arm connects to said connecting
portion.
4. The multi-band antenna as claimed in claim 1, further comprising
a grounding portion arranged around said feeding conductor.
5. The multi-band antenna as claimed in claim 4, wherein said
antenna body is located on a top of a display of a laptop, a free
end portion of said third radiating branch is located on a front
surface of said display of said laptop, said feeding conductor and
said grounding portion are located on a back surface of said
display of said laptop, said laptop operates said multi-band
antenna through a cable connecting to said feeding point and said
grounding portion.
6. The multi-band antenna as claimed in claim 5, wherein said
grounding portion electronically connects to a ground of said
laptop.
7. A multi-band antenna operating at a low frequency bandwidth and
a high frequency bandwidth two to three frequency higher than said
lower frequency bandwidth comprising: an elongated antenna body
having a first end and a second end, said antenna body having a
first radiating branch, a second radiating branch having said first
end and extending from one end of said first radiating branch and a
third radiating branch having said second end and extending from
the other end of said first radiating branch; a feeding conductor
connecting to said antenna body having a first side arm, a second
side arm opposite to said first side arm and a connecting portion,
one end of said first and second side arms respectively connecting
both ends of said connecting portion, the other end of said first
and second side arms respectively connecting said antenna body, a
length from said feeding conductor connecting said antenna body to
said first end substantially a quarter of the wavelength of said
high frequency bandwidth, a length from said feeding conductor
connecting said antenna body to said second end substantially a
quarter of the wavelength of said low frequency bandwidth; and a
feeding point arranged at a corner where said first side arm
connects to said connecting portion.
8. The multi-band antenna as claimed in claim 7, wherein the length
of said first radiating branch is longer than the length of said
second radiating branch, the width of said first radiating branch
is narrower than the width of said second radiating branch, the
length of said third radiating branch is shorter than said length
of said first radiating branch, the width of said third radiating
branch is wider than said width of said first radiating branch.
9. The multi-band antenna as claimed in claim 7, wherein said first
and second side arms respectively have an outer edge opposite to
each other, said outer edge of said first side arm is at same level
with an area where said first radiating branch connects to said
second radiating branch.
10. The multi-band antenna as claimed in claim 9, further
comprising a grounding portion arranged around said feeding
point.
11. The multi-band antenna as claimed in claim 10, wherein said
multi-band antenna is folded to fit for being configured in a
portable electronic device, said antenna body and said feeding
conductor is substantially located on different planes of said
portable electronic device.
12. The multi-band antenna as claimed in claim 11, wherein said
grounding portion is a ground of said portable electronic device.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention relates to a multi-band antenna, and
particularly to a multi-band antenna which is adapted for
configuring in portable electrical devices.
[0003] 2. The Related Art
[0004] There is a growing requirement for multi-band antennas used
in wireless communication devices to adapt multi-band operation of
wireless communication devices. It is necessary that an antenna
adapting to being configured in wireless communication devices is
capable of operating in various wireless communication bands such
as GSM850 (Global System for Mobile communications), EGSM (Extended
Global System for Mobile communications), DCS1800 (Digital Cellular
System), PCS1900 (Personal Conferencing Specification), W-CDMA2100
(Wideband Code Division Multiple Access), Wi-Fi (Wireless
Fidelity), etc.
SUMMARY OF THE INVENTION
[0005] An object of the present invention is to provide a
multi-band antenna operating in various wireless communication
bands.
[0006] According to the invention, the multi-band antenna includes
an antenna body defining opposite ends and a feeding conductor
connecting to the antenna body. The antenna body has a first
radiating branch defining opposite elongated edges, a second
radiating branch extending from one end of the first radiating
branch and a third radiating branch extending from the other end of
the first radiating branch. Wherein the length of the first
radiating branch is larger than the length of the second radiating
branch and the length of the first radiating branch is also larger
than the length of the third radiating branch.
[0007] The feeding conductor is curved to U-shape having a feeding
point. The feeding conductor has opposite side arms and a
connecting portion. One end of each side arm respectively connects
to the second radiating branch and the other end of each side arm
respectively connects both ends of the connecting portion. An outer
edge of one of the side arms is at the same level with an area
where the first radiating branch connects to the second radiating
branch. The feeding point is arranged at a corner of the feeding
conductor near the outer edge connecting the first radiating
branch.
[0008] While the multi-band antenna operates at wireless
communication, the multi-band antenna has a low frequency bandwidth
and a high frequency harmonic bandwidth. According to the position
where the feeding conductor connects to the antenna body, and the
position where the feeding point is arranged at the corner of the
feeding conductor, the multi-band antenna has a preferred range of
the low frequency bandwidth and the high frequency harmonic
bandwidth. Therefore, the low frequency bandwidth of the multi-band
antenna includes GSM850 and EGSM bands and the high frequency
harmonic bandwidth of the multi-band antenna includes DCP1800,
PCS1900, W-CDMA2100 and Wi-Fi bands.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The present invention will be apparent to those skilled in
the art by reading the following description of a preferred
embodiment thereof, with reference to the attached drawings, in
which:
[0010] FIG. 1 shows the structure of a preferred embodiment of a
multi-band antenna according to the present invention; and
[0011] FIG. 2 illustrates the multi-band antenna configured in a
notebook.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0012] Please refer to FIG. 1, which shows the structure of a
preferred embodiment of a multi-band antenna 100 according to the
present invention. The multi-band antenna 100 is made of metallic
substances for example, making from a metal foil, printing on a
printed circuit board and etc, having an antenna body 1 and a
feeding conductor 2.
[0013] The antenna body 1 defining a first end 13 and a second end
14 includes a first radiating branch 10 defining opposite elongated
edges. A second radiating branch 11 having the first end 13 extends
from one end of the first radiating branch 10. In this case, the
width of the first radiating branch 10 is narrower than the width
of the second radiating branch 11 and the length of the first
radiating branch 10 is longer than the length of the second
radiating branch 11. A third radiating branch 12 having the second
end 14 extends from the other end of the first radiating branch 10.
The third radiating branch 12 is perpendicular to the first
radiating branch 10. In this case, the length of the third
radiating branch 12 is shorter than the length of the first
radiating branch 10 and the width of the third radiating branch 12
is wider than the width of the first radiating branch 10. In this
case, both the second radiating branch 11 and the third radiating
branch 12 project toward the same direction.
[0014] The feeding conductor 2 connects to the antenna body 1. In
this case, the feeding conductor 2 extends from an edge of the
second radiating branch 11. In this case, the feeding conductor 2
and the second radiating branch 11 project to opposite directions.
The feeding conductor 2 is curved to form U-shape having a first
side arm 20, a second side arm 21 opposite to the first side arm 20
and a connecting portion 22. The first and second side arms 20, 21
respectively have an inner edge facing each other and an outer edge
opposite to the inner edge. One end of the first and second side
arms 20, 21 respectively connects to the second radiating branch
11. The other end of the first and second side arms 20, 21
respectively connects to both ends of the connecting portion
22.
[0015] In this case, the outer edge of the first side arm 20 is at
the same level with an area where the first radiating branch 10
connects to the second radiating branch 11. A feeding point 3 is
arranged at a corner where the first side arm 20 connects to the
connecting portion 22. A grounding portion 4 is arranged around the
feeding conductor 2. In this case, the grounding portion 4 is
arranged to close a corner where the first branch 10 connects to
the first side arm 20 of the feeding conductor 2.
[0016] Referring to FIG. 2, the multi-band antenna 100 is folded
for fitting in portable electrical devices. In this case, the
multi-band antenna 100 is configured in a laptop 200. The first
radiating branch 10, the second radiating branch 11 and the third
radiating branch 12 are located on a top 201 of a display of the
laptop 200. An end portion of the third radiating branch 12 is
located on a front surface 202 of the display of the laptop 200.
The feeding conductor 2 and the grounding portion 4 are located on
a back surface 203 of the display of the laptop 200. In this case,
the grounding portion 1 electronically connects to a ground of the
laptop 200. Otherwise, in a further embodiment, the grounding
portion 4 could be the ground of the laptop 200. The laptop 200 can
operate the multi-band antenna 100 through a cable 204 connecting
to the feeding point 3 of the multi-band antenna 100 and the ground
portion 4 for sending and receiving wireless signal.
[0017] While the multi-band antenna 100 operates at wireless
communication, the multi-band antenna 100 resonates a low frequency
bandwidth and a high frequency harmonic bandwidth. In this case, a
length from the feeding conductor 2 connecting the antenna body 1
to the second end 14 of the antenna body 1 is a quarter of the
wavelength of the low frequency bandwidth. A length from the
feeding conductor 2 connecting the antenna body 1 to the first end
13 of the antenna body 1 is a quarter of the wavelength of the high
frequency harmonic bandwidth.
[0018] Therefore, according to the position where the feeding
conductor 2 connects to the antenna body 1 and the position where
the feeding point 3 is arranged at the corner of the feeding
conductor 2, the multi-band antenna 100 has a preferred low
frequency bandwidth and a high frequency harmonic bandwidth.
Because the outer edge of the feeding conductor 2 is at the same
level with the area where the first radiating branch 10 connecting
the second radiating branch 11 and the feeding point 3 is arranged
at the corner where the first side arm 20 connecting to the
connecting portion 22, the low frequency bandwidth of the
multi-band antenna 100 includes GSM850 and EGSM bands and the high
frequency harmonic bandwidth of the multi-band antenna 100 includes
DCP1800, PCS1900, W-CDMA2100 and Wi-Fi bands.
[0019] Moreover, the U-shape feeding conductor 2 is designed for
balancing horizontal polarization and vertical polarization of the
multi-band antenna 100 and enhancing the low frequency bandwidth of
the multi-band antenna 100.
[0020] Furthermore, the present invention is not limited to the
embodiments described above; various additions, alterations and the
like may be made within the scope of the present invention by a
person skilled in the art. For example, respective embodiments may
be appropriately combined.
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