Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2000-03-01
2001-04-24
Le, Hoanganh (Department: 3662)
Communications: radio wave antennas
Antennas
Microstrip
C343S846000
Reexamination Certificate
active
06222488
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an antenna structure for communication, which is especially suitable for a base station (BS) in the radio communication system as a signal transceiver between the base station and mobile terminals to increase the half-power beamwidth in the H-plane.
2. Related Art
Nowadays, the mobile phone has become an essential communication tool in our everyday life and tends to become more popular. The usage of the mobile phone is very similar to that of the conventional telephone. The signal transmission of the mobile phone is duplex so that persons can talk to each other simultaneously. And in order to protect personal privacy, every mobile phone customer has an exclusive phone number and can talk to somebody in coded format via the base station.
Nevertheless, the most popular communication scheme used in the current base stations is the cellular scheme, wherein the high power transmitter for each communication region has been replaced by a lot of low power transmitters, which are also called cells, spreading over the same region. Therefore, in order to cover the communication region throughout and obtain good signal quality, it is necessary to set up a great numbers of cells. And the transmission power, horizontal angular range, and vertical angular range of the base station have also become important parameters to improve the signal quality. If the total amount of antenna can be reduced as low as possible while covering even wider transmission and reception region, the economic profit would be greatly increased.
FIG. 1
shows a three-dimensional structure sketch of a conventional antenna, which comprises:
a slot coupled a microstrip patch
20
, made of a low-loss dielectric flat plate, wherein there is a microstrip
21
on the back plane and a slot
22
on the front plane. The patch is connected to a signal source, which is not shown in this figure, via a conducting line
40
;
a reflector
30
, which is a metal plate attached to the back plane of the slot coupled microstrip patch
20
in the manner of electrical isolation so that the backward radiated electromagnetic waves would be reflected forward; and
an antenna combination
10
, placed in front of the slot coupled microstrip patch
20
in the manner of electrical isolation so as to increase the radiation power of the electromagnetic waves. The antenna combination
10
comprises a front-plate
11
a
and a patch
11
b,
which are both connected to the slot coupled microstrip patch
20
in parallel and in the manner of electrical isolation. The areas of the patch
11
b
and the front-plate
11
a
are the same so as to increase the radiation power of the electromagnetic waves.
By using the above antenna structure to transmit signals, the horizontal transmission angle &thgr; will be limited within the range of 60° to 70° from center, or 80° at maximum. Therefore, as far as this rectangular antenna structure is concerned, it is very difficult to satisfy the demand of large signal transmission and wide reception range.
SUMMARY OF THE INVENTION
The primary object of the present invention is to provide an antenna structure for communication, used in a base station of radio communication as a signal transceiver between the base station and several mobile terminals. And the structure is also designed for increasing the half-power beamwidth in the H-plane.
Another object of the present invention is to provide an antenna combination for the base station mentioned above so that the half-power beamwidth in the H-plane can be extended over 90° or even higher.
To achieve the above objectives, the antenna structure according to the present invention comprises a slot coupled microstrip patch for radiating electromagnetic waves and a reflector. The antenna combination is placed in front of the slot coupled microstrip patch in the manner of electrical isolation so as to increase the half-power beamwidth of the radiated electromagnetic waves, and that antenna combination comprises:
a front-plate, which comprises a first flat plate, a second flat plate, and a curved plate, which is used to connect the first flat plate and the second flat plate. The first flat plate and the second flat plate are placed in the same plane and electrically connected to the curved plate; and
several patches, parallel to the first flat plate and the second flat plate, and the connection between the front-plate and the patches is electrically isolated. The area of each patch is the same as the projected area of the front-plate onto the patch so as to increase the radiation power of the electromagnetic waves.
If the two-plate antenna structure commonly used in the conventional base station can be replaced by the present antenna combination, the transmission angle would be greatly widened due to the curved plate in the front-plate and the signal transmission/reception region would also be greatly extended.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
REFERENCES:
patent: 5307075 (1994-04-01), Huynh
patent: 5801660 (1998-09-01), Ohtsuka et al.
patent: 6054953 (2000-04-01), Lindmark
Ho-Chun Chang
Pai-Chuan Chen
Birch & Stewart Kolasch & Birch, LLP
Le Hoang-anh
SmartAnt Telecomm Co., Ltd.
LandOfFree
Antenna structure for communication does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Antenna structure for communication, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Antenna structure for communication will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2505904