Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2000-04-04
2001-04-24
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S834000
Reexamination Certificate
active
06222490
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The present invention relates to antenna and more particularly to a fishbone-shaped patch antenna employed in radio communication base station for transmitting signals to mobile terminal and receiving signals from mobile terminal with increased half-power beamwidth in the horizontal plane.
2. Related Art
Mobile phones have become popular in recent years. More people use it as a necessary communication means in daily life. In use, mobile phone has a similar function as wired telephone. That is, mobile phone can effect a two-way communication. Further, each mobile phone has a unique number. Each mobile phone user can make a call to a called party by transmitting encoded signals via base station.
It is understood that most base stations effect a cellular communication principle. That is a high power transmitter for covering all areas is replaced by employing a plurality of low power transmitters in many sectors called cells. As such, many cells are employed to ensure a sufficient communication quality and desired transmitting and receiving ranges. In view of this, transmission power of base station and horizontal and vertical angle ranges of antenna are important factors. It is desired that a cost-effective design may be effected by employing a small number of antennas to obtain a wider transmission and receiving ranges.
A prior art rectangular patch antenna
10
is shown in
FIG. 1
comprising a slot coupled microstrip patch antenna
20
made of low loss dielectric plate having a microstrip
21
in rear and a gap or slot
22
in front being connected to signal source (not shown) through a conductor
40
; a reflector
30
made of metal plate being non-electrically connected to the rear of slot coupled microstrip patch antenna
20
so as to cause rearward radiated electromagnetic waves to reflect forward; and a resonant member
11
in front of and being non-electrically connected to slot coupled microstrip patch antenna
20
so as to increase directivity, operation band width, an d power of electromagnetic waves.
Signals transmitted by above antenna have a half-power beamwidth with average value of 60°-70° in the center or a maximum value of 80° in the horizontal plane. As such, it is impossible to obtain a wider transmission and receiving ranges by such conventional rectangrular antenna.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a fishbone-shaped patch antenna employed in radio communication base station serving, as signal transmitting/receiving terminal between base station and a plurality of mobile terminals, thereby increasing half-power beamwidth in the horizontal plane.
The advantages of the present invention are realized by providine a fishbone-shaped patch antenna comprising a slot coupled microstrip patch antenna, a reflector, and a fishbone-shaped resonant member in front of and being non-electrically connected to the slot coupled microstrip patch antenna for increasing half-power beamwidth of electromagnetic waves wherein fishbone-shaped resonant member has a planar elongated shape with a plurality of teeth formed on either of the longer edges. This fishbone-shaped resonant member can increase transmission angle as compared with conventional rectangular resonant member in the base station for obtaining a wider range of transmitting/receiving signals.
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, arc 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: 4903033 (1990-02-01), Tsao et al.
Hung-Chang Wu
Jia-Jiu Song
Birch & Stewart Kolasch & Birch, LLP
SmartAnt Telecomm Co., Ltd.
Wimer Michael C.
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