Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2000-04-19
2004-06-01
Trost, William (Department: 2746)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S550100, C455S344000, C455S575100, C455S090300, C343S702000, C343S836000, C343S837000, C343S841000, C343S912000, C379S440000, C379S451000, C361S816000
Reexamination Certificate
active
06745057
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a portable telephone and, more particularly, to a portable telephone with high radiation efficiency and high communication performance.
2. Description of the Related Art
In recent years, portable radio communication equipment typified by a portable telephone has rapidly come into wide use among people.
FIG. 15A
is a perspective view showing the whole of a basic structure of a conventional and typical portable telephone, and
FIG. 15B
shows a structure of the portable telephone with an outer packaging removed and
FIG. 15C
shows a structure only of the outer packaging.
The conventional portable telephone at least includes an antenna
2
, a metallic cabinet
3
, a feeding point
4
and an outer packaging
5
, and the antenna
2
is electrically connected to the upper end portion of the metallic cabinet
3
through the feeding point
4
connected to the lower end portion of the antenna. The outer packaging
5
is made of a material such as plastic or resin and constituted by a hollow cubic portion
5
a
and a cylindrical portion
5
b
disposed on the upper surface of the portion
5
a
, in which a round hole
5
c
whose size is equivalent to the diameter of the cylindrical portion
5
b is provided on the surface of the cubic portion
5
a
in contact with the cylindrical portion, and a speech transmission unit and a speech reception unit are arranged on one of surfaces of the outer packaging
5
. Within the outer packaging
5
, the metallic cabinet
3
, the feeding point
4
and the vicinity of the lower end portion of the antenna
2
are disposed and the antenna
2
is structured to project from the cylindrical portion
5
b
through the round hole
5
c
. Here, the axis of the antenna is made coincide with the z-axis and a width direction and a thickness direction of the metallic cabinet are made coincide with the x-axis and the y-axis, respectively. In addition, the surface of the metallic cabinet and the surface of the outer packaging are in parallel to each other and positioned on the plane xz.
For radiating an electromagnetic wave from the portable telephone, power is supplied to the antenna
2
and the metallic cabinet
3
by the application of power to the feeding point
4
to operate them as main radiation sources. Although a portable telephone in general has a mechanism for transmission and reception, a matching circuit for efficiently supplying power to the feeding point and the like which are mounted on the metallic cabinet, detailed view thereof is omitted from the illustration.
With the conventional portable telephone, a user makes a call through the speech transmission unit and the speech reception unit provided on the surface of the outer packaging
5
while holding the outer packaging by his or her hand. At this state, an electromagnetic wave radiated from the portable telephone is emitted into a space, propagated and received at a base station to enable communication. However, since of the electromagnetic waves radiated from the portable telephone, electromagnetic waves radiated toward a human body are liable to attenuate, the electromagnetic waves to this direction contribute less to communication to cause a reduction of radiation efficiency as a result. As described in the foregoing, conventional portable telephones have shortcomings that a reduction in the amount of electromagnetic waves contributing to communication degrades radiation efficiency of the portable telephones to degrade communication performance accordingly.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a portable telephone with improved communication performance which is attained by increasing radiation efficiency of electromagnetic waves contributing to communication while a call is being made.
Another object of the present invention is to enable even a portable telephone required to be smaller in size and thinner to realize an increase in the amount of electromagnetic waves contributing to communication, thereby improving radiation efficiency during a call to achieve improvement in communication performance by using a reflecting plate also as an outer packaging of the portable telephone.
According to one aspect of the invention, a portable telephone including an antenna and a metallic cabinet operating as main radiation sources of electromagnetic waves, a feeding point for supplying the antenna and the metallic cabinet with electric power, an outer packaging formed of a material such as plastics or resin, and a reflecting plate for reflecting the electromagnetic waves radiated from the radiation sources, wherein
the reflecting plate is provided for increasing the amount of electromagnetic waves radiated into a free space when the portable telephone is in use, selectively arranged at a position where an electric field component or a magnetic field component of the electromagnetic waves radiated from the radiation sources is dominant, and has an electric constant which enables effective reflection of the magnetic field component or the electric field component and causes little electric power absorption.
In the preferred construction, the reflecting plate is contained in the outer packaging and provided in the vicinity of the radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed.
In another preferred construction, the reflecting plate is a flat plate of a predetermined size and arranged in parallel to the metallic cabinet surface.
In another preferred construction, the reflecting plate is
contained in the outer packaging and provided in the vicinity of the radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed, and
a flat plate of a predetermined size and arranged in parallel to the metallic cabinet surface.
In another preferred construction, the reflecting plate is a flat plate of a predetermined size and arranged aslant with respect to the metallic cabinet surface.
In another preferred construction, the reflecting plate is contained in the outer packaging and provided in the vicinity of the radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed, and
the reflecting plate is a flat plate of a predetermined size and arranged aslant with respect to the metallic cabinet surface.
In another preferred construction, the reflecting plate is formed to be convex having a curvature at the side opposite to a direction in which the electromagnetic waves are incident and arranged to have a substantial vertex of the convexity face to the side of the radiation sources.
In another preferred construction, the reflecting plate is contained in the outer packaging and provided in the vicinity of the radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed, and
the reflecting plate is formed to be convex having a curvature at the side opposite to a direction in which the electromagnetic waves are incident and arranged to have a substantial vertex of the convexity face to the side of the radiation sources.
In another preferred construction, the reflecting plate is bent to be V-shaped toward the side opposite to a direction in which the electromagnetic waves are incident.
In another preferred construction, the reflecting plate is contained in the outer packaging and provided in the vicinity of the radiation sources and on the side where a speech transmission unit and a speech reception unit are disposed, and
the reflecting plate is bent to be V-shaped toward the side opposite to a direction in which the electromagnetic waves are incident.
In another preferred construction, the reflecting plate is formed of a magnetic material having such a complex relative permeability as causes little power absorption of the electromagnetic waves radiated from the radiation sources.
In another preferred construction, the reflecting plate is formed of a dielectric material having such a complex relative dielectric
NEC Corporation
Torres Marcos
Trost William
Whitham Curtis & Christofferson, P.C.
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