Chip antenna

Details Chip antenna Chip antenna

2001-11-05

2003-09-09

Wimer, Michael C. (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

Reexamination Certificate

active

06618023

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a chip antenna which is used in mobile communication terminals, wireless local area networks (LAN) and the like. More specifically, the present invention relates to a chip. antenna in which a vertically bent conductor pattern is disposed around a parallelepiped dielectric block so as to make it possible to miniaturize the antenna.
BACKGROUND OF THE INVENTION
Generally, conventional mobile communication apparatus include: a portable phone body, and a rod shaped antenna, the latter projecting from the top of the portable phone body. The antenna is used for transmitting and receiving the radio waves, and the resonant frequency of the antenna is determined by the total length of the antenna conductor.
However, in the antenna for the mobile communication apparatus, the antenna protrudes outside, and therefore, the antenna is affected by the ground potential. As a result, the directivity characteristics are varied, and the miniaturization of the mobile communication apparatuses is impeded.
Japanese Laid-open Patent Application No Hei-10-93320 discloses a chip antenna for solving the above described problems.
As shown in FIGS.
1
(
a
) and
1
(
b
) and
FIG. 2
, this chip antenna includes: a base block
1
made of a dielectric material; a helical conductor
2
disposed in the interior and on the surface of the base block
1
; and a feeding terminal
3
disposed on the surface of the base block
1
, for supplying a voltage to the conductor
2
. The conductor
2
includes a capacitance-forming part
4
; the capacitance-forming part
4
includes a flat part which is disposed in parallel to an open end
4
a
, so that the antenna characteristics can be maintained at a constant level.
In the above described antenna, however, if the pitch intervals of the helical conductor
2
are reduced to miniaturize the antenna, then the frequency bandwidth is decreased, with the result that the miniaturization of the antenna is impeded.
SUMMARY OF THE INVENTION
The present invention is intended to overcome the above described disadvantages of the conventional technique.
Therefore it is an object of the present invention to provide a chip antenna in which the antenna can be miniaturized without causing any variation of the antenna characteristics.
It is another object of the present invention to provide a chip antenna in which the median frequency can be lowered and the length of the conductor line can be increased without causing any reduction of the bandwidth of the antenna.
In achieving the above objects, the chip antenna according to the present invention includes:
a parallelepiped base block of a dielectric or magnetic material;
a conductor pattern including: (a) a plurality of side electrodes disposed laterally on both side faces of the base block; and (b) a plurality of upper and lower electrodes each having bent portions, the upper and lower electrodes adapted to respectively connect to the side electrodes, the side electrodes and the upper and lower electrodes being connected together into a helix disposed around the base block; and
a ground terminal disposed on the base block and connected to a part of the conductor pattern.
In another aspect of the present invention, the chip antenna according to the present invention includes:
a parallelepiped base block having a stack of dielectric or magnetic material sheets;
a conductor pattern including: (a) a plurality of side electrodes disposed laterally on both side faces of the base block; and (b) a plurality of upper and lower electrodes each having bent portions, the upper and lower electrodes adapted to respectively connect to the side electrodes, the bent portions being lengthwisely directed, and the side electrodes and the upper and lower electrodes being connected together into a helix within the base block; and
a ground terminal disposed on the base block and connected to a part of the conductor pattern.


REFERENCES:
patent: 5633649 (1997-05-01), Grossi et al.
patent: 5973651 (1999-10-01), Suesada et al.
patent: 6064351 (2000-05-01), Mandai et al.
patent: 6456246 (2002-09-01), Saito
patent: 10-093320 (1998-04-01), None

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