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Antenna apparatus and protable apparatus using the same

A technology of an antenna device and a portable device, applied in the field of portable devices and antenna devices

Inactive Publication Date: 2004-05-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is easy to match with the matching circuit 102 in this way, but there is always a problem of enlargement

Method used

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  • Antenna apparatus and protable apparatus using the same
  • Antenna apparatus and protable apparatus using the same
  • Antenna apparatus and protable apparatus using the same

Examples

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Embodiment Construction

[0018] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 6 .

[0019] (Embodiment 1)

[0020] Fig. 1 is a block diagram of an antenna device according to Embodiment 1 of the present invention. In FIG. 1, the antenna element 11 uses a monopole antenna element with a length of 40 mm. Here, the reception of the L frequency band of the VHF band—90 MHz to 108 MHz is taken as an example for illustration. Originally, the wavelength is 3m at 100MHz, so even a quarter wavelength requires a 75cm long monopole antenna element. The present invention uses a monopole antenna element 11 with a length of 40mm for reception.

[0021] Here, the antenna element 11 is not limited to a monopole antenna, and may also be a dipole antenna, a sleeve antenna, an in-line antenna, a slot antenna, a microstrip antenna, and the like.

[0022] The resistor 12 is a resistor connected to the monopole antenna element 11, and a resistor of 82 ohms is used in ...

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PUM

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Abstract

An antenna device comprises an antenna element formed in a sufficiently shorter length as compared with the wavelength of transmission or reception wave, a resistor, a matching circuit including at least a reactance element, and an output terminal connected to outside, which are connected in series in this sequence. As a result, an antenna device of smaller size and small loss is obtained.

Description

technical field [0001] The present invention relates to an antenna device using an antenna element sufficiently shorter than the wavelength of transmitting or receiving radio waves and a portable device using the same. Background technique [0002] Hereinafter, a conventional antenna device will be described by taking a receiving antenna device as an example with reference to FIGS. 7 and 8 . [0003] Fig. 7 is a block diagram of a conventional antenna device. As shown in FIG. 7, the existing antenna device is composed of the following parts: an antenna element 101 having a length of approximately a quarter wavelength of a received radio wave; a matching circuit 102 connected to the antenna element 101 and formed by a reactance element formation; and an output terminal 103 connected to the output terminal of the matching circuit 102 . [0004] However, in such a conventional configuration, if an antenna element 101 sufficiently smaller than the wavelength is used in order t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/24H01Q1/38H01Q1/50H01Q9/30
CPCH01Q1/242H01Q9/30H01Q1/38H01Q1/50H01Q1/27
Inventor 日比野靖宏纸元竜一伊藤明永津达也
Owner PANASONIC CORP