Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2000-09-27
2001-09-18
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S846000
Reexamination Certificate
active
06292148
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to radio communication apparatus connected to information processing apparatus such as a personal computer and a PDA, characterized by a compact design for carry-along applications and reduction in a high-frequency noise component entering the high-frequency circuit of the main unit, the noise component originating from the control circuit of information processing apparatus such as a personal computer or a PDA and coming into a receiving frequency of the main unit.
Conventionally, it was a customary practice to use a ¼&lgr; to ⅜&lgr; whip antenna as an antenna for radio communication terminal apparatus where a high-frequency circuit, a communication control circuit, an antenna and a PCMCIA interface were integrated.
FIG. 4
shows a configuration of conventional radio communication terminal apparatus that uses a ¼&lgr; whip antenna. The radio communication terminal apparatus is characterized in that a circuit board
131
is composed of a high-frequency circuit
130
, a communication control circuit
132
and a PCMCIA interface
133
and that the antenna is integrated by connecting the high-frequency circuit
130
and the ¼&lgr; whip antenna
126
.
A ¼&lgr; to ⅜&lgr; whip antenna requires a favorable ground for operation as an antenna. For radio communication terminal apparatus that requires a compact design generally uses the ground for the circuit board
131
also as an antenna ground.
However, the conventional ¼&lgr; to ⅜&lgr; whip antenna requires a broad and stable ground surface in order to obtain stable characteristics. While the circuit board also plays the role of an antenna ground for radio communication terminal apparatus that requires a compact design, further downsizing is under way in recent radio communication terminal apparatus. This makes it difficult to provide a sufficiently stable and wide antenna ground.
For a one-piece design comprising a high-frequency circuit and a communication control circuit in radio communication terminal apparatus, there is a problem that, in case the role of an antenna ground was played by the ground for the communication control circuit, a high-frequency noise component enters the high-frequency circuit via the ground for the main unit, the noise component originating from the communication control circuit of the main unit and coming into a receiving frequency of the main unit.
Also in case radio communication terminal apparatus is connected to information processing apparatus such as a personal computer and a PDA, there is a problem that a high-frequency noise component enters the high-frequency circuit via the ground for the main unit, the noise component originating from the control circuit of the information processing apparatus and coming into a receiving frequency of the main unit.
Thus, incasea high-frequency component noise originating from the communication control circuit of radio communication terminal apparatus or from the control circuit of the information processing apparatus and coming into a receiving frequency of the main unit is a noise signal whose frequency is the same as the receiving frequency, there arises a problem of a cochannel suppression interference.
SUMMARY OF THE INVENTION
The invention solves the problem and aims at providing excellent radio communication terminal apparatus that can reduce a high-frequency noise component entering the high-frequency circuit via the ground for the main unit, the noise component originating from the control circuit, without impairing antenna characteristics.
The first aspect of the invention is radio communications apparatus wherein a first enclosure comprising an antenna and a high-frequency circuit and a second enclosure comprising a communication control circuit and a PCMCIA interface are coupled via a hinge, the apparatus portable as a PCMCIA card size unit when the enclosures and folded, in that the internal surface of the first enclosure and the second enclosure is made of a metal or resin that is metal-plated or metalized, that the internal surface of the first enclosure is designed to use part of the first enclosure as an antenna ground when the antenna is housed, that the high-frequency ground for the first and second enclosures is separated at the central hinge in order to prevent high-frequency currents flowing through the ground for the antenna from flowing into the second enclosure, thus reducing a noise originating from the control circuit of the information processing apparatus or from the communication control circuit of the main unit as a coupling quantity entering the antenna or the ground for the antenna, and that the radio communications apparatus is connected to the information processing apparatus via the PCMCIA interface thus confining a noise originating inside the second enclosure via a shielded structure of the internal surface of the second enclosure.
Via this configuration, a noise originating from the control circuit of the information processing apparatus such as a personal computer or a PDA or from the communication control circuit of the main unit can be reduced as a coupling quantity entering the antenna or the ground for the antenna, thus suppressing the influence of a harmonic noise originating from the control circuit coming into the receiving spectrum of the main unit.
The second aspect of the invention is radio communications apparatus according to the first aspect of the invention, in that a battery is mounted on the first enclosure.
Via this configuration, communication time or wait time can be extended for radio communication terminal apparatus with high current consumption.
The third aspect of the invention is radio communications apparatus according to the second aspect of the invention, in that the power supply for the information processing apparatus is used to recharge the battery.
Via this configuration, a battery mounted onto the first enclosure can be recharged by using the power supply for information processing apparatus such as a personal computer and a PDA.
The fourth aspect of the invention is radio communication terminal apparatus according to any of the first through third aspects of the invention, in that the length of the antenna attached to the first enclosure is a length that is within the maximum longitudinal length of the first enclosure when the antenna is housed.
Via this configuration, the length of a antenna assumed when the antenna is extended can be maximized.
The fifth aspect of the invention is radio communication terminal apparatus according to the fourth aspects of the invention, in that the apparatus uses a telescopic rod antenna reaching a length of ½&lgr; of the service frequency when the antenna is extended.
Via this configuration, by making the length of the antenna ½&lgr; of the service frequency, it is possible to prevent unwanted high-frequency currents from flowing into the ground for the circuit board.
The sixth aspect of the invention is radio communication terminal apparatus according to the fifth aspect of the invention, in that the apparatus comprises a mechanism whereby the antenna can be rotated 360 degrees when the antenna is extended.
Via this configuration, by adjusting the position of the antenna while the first enclosure is at a given angle, the best receiving field can be obtained.
REFERENCES:
patent: 5566226 (1996-10-01), Mizoguchi et al.
patent: 5821903 (1998-10-01), Williams
patent: 5949379 (1999-09-01), Yang
patent: 6189056 (2001-02-01), Ogura et al.
Kamiya Tadahisa
Matsuura Iwao
Yagita Hideki
Matsushita Electric - Industrial Co., Ltd.
Nguyen Hoang
Pearne & Gordon LLP
Wong Don
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