Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2002-09-18
2004-08-10
Phan, Tho (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S702000, C343S846000, C343S847000
Reexamination Certificate
active
06774850
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an antenna, and particularly to a broadband couple-fed planar antenna with coupled radiating strips electrically connected to a ground plane.
2. Description of the Related Art
In the field of wireless communication systems, it is very important to develop small and low profile antennas for the miniaturization of communication equipment. Various types of the inverted-F antennas have been proposed for this application, because they are compact in their dimensions, easy to manufacture, and exhibit good electrical performance. The inverted F antenna allows a simple impedance match in a low-profile.
FIG. 1
(PRIOR ART) is the exploded view of a conventional aperture coupled microstrip antenna. As shown in
FIG. 1
, the aperture coupled microstrip antenna
100
includes a ground plane
110
with a aperture
111
, a feeding microstrip
101
placed at one side of the ground plane
110
, and a patch
120
placed at the opposite side of the ground plane
110
. This antenna demonstrates a stacked configuration, exhibiting a relatively complicated structure. The dimensions of the feeding microstrip
101
and the aperture
111
should be properly designed. The dimensions of the patch
120
, the radiator, are determined by the half-wavelength resonance. Therefore, for the application of bluetooth and wireless local area network (WLAN), the dimensions of the aperture coupled microstrip antenna are relatively large and thus take up space.
FIG. 2
(PRIOR ART) shows a planar inverted-F antenna with a length of approximate quarter wavelength. The planar inverted-F antenna
200
includes a patch
220
, a ground plane
210
, a short strip
230
, and a feeding line
201
. The disadvantage of the planar inverted-F antenna
200
is that it requires a short strip or short pin.
FIG. 3
(PRIOR ART) shows another planar inverted-F antenna with a direct feeding microstrip. The inverted-F antenna
300
includes a inverted-F strip
301
, a ground plane
310
, a metal plane
340
, and via holes
330
. The disadvantage of the inverted-F antenna
300
is that it requires via holes. The via holes
330
are employed in the structure to connect electrically the ground plane
310
and the metal plane
340
.
A significant problem with the inverted-F antennas mentioned above is that extra fabrication processes are required.
Usually, the conventional inverted-F antenna has relatively narrow bandwidth. It is not flexible to broaden the conventional inverted-F antenna bandwidth.
A compact antenna which is broadband and compatible with PCB structure is needed.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a broadband couple-fed planar antenna, which has an flexible design in operating bandwidth and a high compatibility with PCB structure.
The present invention achieves the above-indicated objects by providing a first type of the broadband couple-fed planar antenna. It comprises one grounded radiators, electrically connected to a ground plane, having a first segment extended from an edge of the ground plane and a second segment bending at an angle, and a feeding line disposed above the ground plane and extended from the edge the ground plane and parallel to the first segment of the grounded radiator.
The present invention achieves the above-indicated objects by providing a second type of the broadband couple-fed planar antenna. It comprises two grounded radiators, electrically connected to a ground plane, having a first segment extended from an edge of the ground plane and a second segment bending at an angle, and a feeding line disposed above the ground plane and extended from the edge the ground plane and parallel to the first segment of the grounded radiators.
These two grounded radiators broaden the bandwidth of the antenna.
The present invention also discloses a third type of broadband couple-fed antenna. It comprises three grounded radiators, electrically connected to a ground plane, having a first segment extended from an edge of the ground plane and a second segment bending at an angle, and a feeding microstrip line disposed above the ground plane and extended from the edge of the ground plane and parallel to the first segment of the grounded radiators.
These three grounded radiators achieve an even broad bandwidth.
REFERENCES:
patent: 4494120 (1985-01-01), Garay
patent: 4516127 (1985-05-01), Siwiak
patent: 4591863 (1986-05-01), Patsiokas
patent: 4628322 (1986-12-01), Marko et al.
patent: 4641366 (1987-02-01), Yokoyama et al.
patent: 4876552 (1989-10-01), Zakman
“Behavior of Hand-held Transceivers in the Presence of Human Body” Bachelor of Engineering Honours Thesis by Sze Yong Lee, University of Queensland, Australia, Oct. 2000.
High Tech Computer Corp.
Phan Tho
Rabin & Berdo P.C.
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