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Built in antenna apparatus

A technology with built-in antenna and equipment

Inactive Publication Date: 2003-12-31
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, with a typical built-in antenna device, the antenna element has a continuous surface or the built-in antenna itself has a planar shape in order to provide a specific width of the electromagnetic wave absorbing material, therefore, a specific width is required and there are limitations to miniaturization and thinning
[0006] Also, the antenna needs to operate over a wide bandwidth and increase the gain during communication in order to utilize the frequency band used by the system, and a single antenna element can only increase the gain to a limited extent

Method used

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Examples

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Effect test

no. 1 example

[0030] figure 1 shows the configuration of the built-in antenna device according to the first embodiment of the present invention;

[0031] The built-in antenna device 10 includes a circuit board 11 , a dipole antenna (radiating element) 12 , a balun 13 , a passive element 14 and a housing 15 . Hereinafter, the length direction of the housing 15 should be configured as follows: the direction in which the dipole antenna 12, the balun 13, and the passive components 14 are located is the depth side, and the dipole antenna 12, the balun 13 are not provided , the direction of the passive component 14 is the front side.

[0032] The dipole antenna 12 is provided on the circuit board 11 with both ends bent in the front side direction. In the power supply portion around the middle of the dipole antenna 12 is provided a balun 13 which is a balun that prevents the antenna current from flowing to the circuit board or to the housing 15 . Furthermore, the passive element 14 is disposed ...

no. 2 example

[0036] An essential feature of the built-in antenna device of the second embodiment of the present invention is that both ends of the parasitic element are bent toward each other so as to transmit and receive vertically polarized waves in the length direction of the housing.

[0037] figure 2 The configuration of the built-in antenna device according to the second embodiment of the present invention is shown. and figure 1 The parts in the same figure 2 Parts in the specified as with figure 1 The same reference numerals are used without further description.

[0038] The built-in antenna device 20 includes a circuit board 11 , a dipole antenna 12 , a balun 13 , a passive element 24 and a housing 15 . Hereinafter, the length direction of the housing 15 should be configured as follows: the direction where the dipole antenna 12, the balun 13, and the passive component 24 are located is on the depth side, and the dipole antenna 12, the balun 13 are not provided. , The directi...

no. 3 example

[0044]An essential feature of the built-in antenna device of the third embodiment of the present invention is that one end of the parasitic element is bent while the other end remains unbent so as to transmit and receive vertically polarized waves in the length direction of the housing.

[0045] image 3 The configuration of the built-in antenna device according to the third embodiment of the present invention is shown. and figure 1 The parts in the same image 3 Parts in the specified as with figure 1 The same reference numerals are used without further description.

[0046] The built-in antenna device 30 includes a circuit board 11 , a dipole antenna 12 , a balun 13 , a passive element 34 and a housing 15 . Hereinafter, the length direction of the housing 15 should be configured such that the direction where the dipole antenna 12, the balun 13, and the passive element 34 are located is on the depth side, and the dipole antenna 12, the balun 13 are not provided. , the di...

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Abstract

A built-in antenna apparatus the whole of which is much smaller and much thinner than conventional while widening the band without making the apparatus itself platelike, and which has an improved a gain and a reduced SAR (Specific Absorption Rate). Adjustment of the length and thickness of a dipole antenna (12) and those of a passive device (14) and the distance between them to predetermined values makes it possible to vary the self-impedance of the dipole antenna (12), self-impedance of the passive device (14), the mutual-impedances of the dipole antenna (12) and passive device (14), and the input impedance of a built-in antenna apparatus (10), resulting in widening of the band.

Description

technical field [0001] The present invention relates to internal antennas. Background technique [0002] In recent years, communication devices such as mobile terminal devices have been continuously developed, and communication devices need to be miniaturized. There are also demands for miniaturization and thinning of built-in antennas embedded in communication equipment. [0003] Within the bandwidth required by the mobile communication system and used by communication terminals such as mobile terminal equipment, the built-in antenna device should be able to work with a wider bandwidth. [0004] Japanese Laid-Open Patent No. 2000-349526 discloses an example of a built-in antenna device of the above-mentioned type. This built-in antenna is used to increase the Wide bandwidth while making it miniaturized and thin. [0005] However, with a typical built-in antenna device, the antenna element has a continuous surface or the built-in antenna itself has a planar shape in orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q19/30H01Q1/24H01Q1/38H01Q5/00H01Q9/16H01Q19/00
CPCH01Q9/16H01Q1/245H01Q1/243H01Q5/0062H01Q19/005H01Q5/378
Inventor 小岛优伊藤英雄
Owner PANASONIC CORP