Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
1999-02-17
2003-05-20
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
Reexamination Certificate
active
06567045
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a communication field, and particularly relates to miniaturization and configuration of a wide angle circular polarization antenna adapted for portable radio communication using a satellite.
BACKGROUND OF THE INVENTION
Recently, plans of a portable telephone using a satellite have been proposed by some companies. A band of 1.6 GHz is allocated to communication (transmission) from a ground portable telephone to a satellite, and a band of 2.4 GHz is allocated to communication from the satellite to the ground portable telephone. The band of 1.6 GHz is also allocated as a frequency band used for bidirectional communication from the ground to the satellite and from the satellite to the ground.
An antenna adapted for such satellite communication, an omnidirectional antenna, is proposed in (JP-A-7-183719).
FIG. 12
shows the structure of this omnidirectional antenna disclosed in the JP-A-7-183719.
In
FIG. 12
, a microstrip planar antenna (MSA)
1
is constituted by a feeding pin
1
a
, a patch-like radiating element
1
b
, and a dielectric substrate
1
c
. The MSA
1
is characterized such that a ground conductor plate
1
d
is extended downward to form a conductor cylinder
1
e
as a ground.
Usually, the MSA
1
has a configuration such that the patch-like radiating element
1
b
is arranged on the ground conductor plate
1
d
in parallel therewith through the dielectric substrate
1
c
. However, the omnidirectional antenna shown in
FIG. 12
is characterized in such a way that the whole circumference of the ground conductor plate
1
d
is extended downward to form a cylindrical shape.
By this characteristic, in the omnidirectional antenna shown in
FIG. 12
, the ground conductor plate
1
d
of the microstrip planar antenna (MSA)
1
is extended downward to improve the gain at a low elevation angle.
In this omnidirectional antenna, however, it is difficult to obtain sensitivity of a horizontally polarized component of a circular polarization at a low elevation angle. Accordingly, in practical use, it is difficult to keep sensitivity of communication since trees or the like absorb a vertically polarized component.
SUMMARY OF THE INVENTION
The present invention discloses a plurality of planar radiating elements that are disposed under a ground conductor plate of a microstrip planar antenna and electrically coupled with the ground conductor plate.
Further, a plurality of planar radiating elements and a plurality of linear radiating elements are disposed under a ground conductor plate of a microstrip planar antenna and electrically coupled with the ground conductor plate. Further, a sperrtopf (blocking bushing) is provided. The “sperrtopf” is a blocking bushing having a configuration in which a cylindrical conductor of ¼ wavelength or ½ wavelength is provided to cover a coaxial line in a vicinity just under the feeding point of the antenna in order to prevent a leakage current from flowing in the outer surface of the outer conductor of the coaxial cable, the cylindrical conductor being opened on the antenna side while it is connected at the other side to the outer conductor of the coaxial line.
REFERENCES:
patent: 4958162 (1990-09-01), Roberts et al.
patent: 5233360 (1993-08-01), Kuroda et al.
patent: 5248988 (1993-09-01), Makino
patent: 5552798 (1996-09-01), Dietrich et al.
patent: 5650788 (1997-07-01), Jha
patent: 0 821 428 (1996-01-01), None
patent: 6-140823 (1994-05-01), None
patent: 7-183719 (1995-07-01), None
patent: 9-98018 (1997-04-01), None
Morishima Takahito
Ookita Hideto
Suguro Akihiro
Kyocera Corporation
Schulte Roth & Zabel LLP
Wimer Michael C.
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