Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-03-05
2002-01-01
Kincaid, Lester G. (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S575100, C455S090300, C343S702000
Reexamination Certificate
active
06336037
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a portable radio terminal device provided with both data communication and telephone functions.
2. Related Art Statement
Recently, various portable radio terminal devices are widely spread: portable radio telephones such as cellular phones and car phones, and portable data communication devices utilizing both portable radio telephone and computer devices. To maintain a good radio transmission between a portable radio terminal device and base stations, more and more transmission base stations are constructed and the antenna performance of the portable radio terminal device is maintained and improved.
However, the human body of the portable radio terminal device user has properties to scatter the radio frequency waves. For example, in case of a portable radio telephone device, holding of the portable radio telephone device in hand deteriorates the antenna gain by 5 dB and the contact of the antenna with the human head causes a gain deterioration of 10 dB. For this, in addition to the improvement of the antenna gain itself, the antenna is positioned so that it does not contact with the human head when the speaker of the portable radio telephone device is in contact with the human the human ear. Some portable radio telephone devices are provided with two types of antennas (a bar type antenna and a built-in antenna) and adopt the diversity antenna switching system so that the larger wave input to the antennas can be sent to the portable radio telephone device.
On the other hand, the portable radio telephone device is used for data communication in addition to the telephone application. Portable radio terminal devices incorporating a small computer to achieve both data communication and telephone functions are also becoming popular.
FIGS. 1A and 1B
show the related art of the portable radio terminal device as described above.
FIG. 1A
is a front perspective view in which a portable radio terminal device is seen from the front and
FIG. 1B
is a back perspective view in which a portable radio terminal device with its case partially cut away is seen from the back.
The reference numeral
40
in the figure indicates a portable radio terminal device. The reference numeral
41
indicates a case having a shape of a thin rectangular parallelepiped,
42
indicates a data input/output section consisting of an LCD element and piezoelectric sensors,
43
indicates a speaker,
44
indicates a microphone,
45
indicates a bar antenna which extends and contracts flexibly,
46
indicates a plate type built-in antenna incorporated in the case
41
, and
47
indicates a signal data circuit section, in which a circuit for processing radio signals and information data is mounted on a printed wiring board.
The data input/output section
42
, the speaker
43
, the microphone
44
, the bar antenna
45
and the plate antenna
46
are respectively connected to the signal data circuit section
47
. When the device is used for telephone service, the voice input from the microphone
44
is processed at the signal data circuit section
47
and then sent by radio transmission to base stations via the bar antenna
45
or the plate antenna
46
. At the same time, the signal sent from base stations by radio transmission is received by the bar antenna
45
or plate antenna
46
, processed at the signal data circuit section
47
and then output from the speaker
43
. When the device is used for data communication, the data input from the data input/output section
42
is processed at the signal data circuit section
47
, transmitted from the bar antenna
45
and/or plate antenna
46
to base stations. The device also receives the data transmitted from base stations, processes such data at the signal data circuit section
47
and then outputs or displays the data at the data input/output section
42
. Note that the plate antenna
46
is the one most popularly used as the built-in antenna of portable telephones at present.
The portable radio terminal device
40
as described above has different spatial relations with the human body depending on its applications (whether it is used for radio telephoning or for data communication).
FIGS. 2A
to
2
C show the utilization status of the portable radio terminal device
40
depending on the application.
FIG. 2A
shows the radio telephone application, when the user holds the portable radio terminal device
40
in hand and applies the speaker
43
to the ear for talking over phone.
FIG. 2B
shows the data communication application, when the user holds an end of the case
41
of the portable radio terminal device
40
by one hand and inputs data or makes data communication operations with the input pointer on the data input/output section
42
by the other hand.
FIG. 2C
shows another status of the data communication application, when the user places the portable radio terminal device
40
on the desk and inputs data or makes data communication operations with the input pointer on the data input/output section
42
by one hand.
Though it is not shown, the user sometimes uses the portable radio terminal device
40
for data communication by placing it on the lap keeping the status shown in
FIG. 2B
so that the device is used not on the desk but on the user's lap.
The portable radio terminal device
40
as described above has various utilization styles depending on the user both for radio telephoning and for data communication, and has diversified spatial relations with the human body. The area of contact between the portable radio terminal device
40
and the human body increases or decreases depending on the utilization style, and the influence caused by scattering of the radio frequency input to the bar antenna
45
and the plate antenna
46
also increases or decreases. As a result, even an antenna with optimum properties for a certain utilization style may have the characteristics largely deteriorated in other utilization styles.
Specifically,
FIG. 3A
shows the radio telephone application using the portable radio terminal device
40
. In this case, the area from the speaker
43
to the section representing substantially a half of the data input/output section
42
on the surface of the portable radio terminal device
40
(shaded area
51
a
in the figure) is in contact with or is positioned very closely to the human head. In addition, as shown in
FIG. 3B
, the user holds the portable radio terminal device
40
from the back in either the right or left hand by gripping both its sides in order to position the device
40
near the human head. As a result, at least both sides of the portable radio terminal device
40
(shaded areas
51
b
and
51
c
in the figure) are in contact with the human body. Further, when the user holds the portable radio terminal device
40
tightly in hand, the palm comes into contact with the back of the device
40
.
On the other hand, in the data communication application using a portable radio terminal device
40
, supposing that the user is right-handed, the user generally grasps the head of the portable radio terminal device
40
with the bar antenna
45
and the speaker
43
by the left hand as shown in FIG.
4
A and inputs data or makes data communication operations with the right hand using the data input pointer. In this case, the vertical face (shaded area
51
d
in the figure) of the portable radio terminal device
40
held by the left hand is in contact with the hand. In particular, when the bar antenna
45
of the portable radio terminal device
40
is entirely or partially covered with the left hand, the antenna characteristics are largely deteriorated by the left hand.
Besides, when the back of the portable radio terminal device
40
(the opposite side of the surface where the data input/output section
42
, the speaker
43
and the microphone
44
are positioned) is placed directly on the desk, the portable radio terminal device
40
is closely in contact with the desk on its back (shaded area
5
l
e
in FIG.
4
B). Many desks are recent
Miyasaka Toshiki
Odachi Noriaki
Sekine Syuuichi
LandOfFree
Portable radio terminal device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Portable radio terminal device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Portable radio terminal device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2874332