Ceramic chip antenna

Details Ceramic chip antenna Ceramic chip antenna

2002-11-20

2004-11-30

Vannucci, James (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S7000MS

Reexamination Certificate

active

06825819

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a ceramic chip antenna, and more particularly, to a ceramic chip antenna of a helix structure with application to a wireless communication system.
BACKGROUND OF THE INVENTION
Ceramic chip antennas have been widely accepted as an antenna element in the field of wireless communications due to their compactness. Typically, as shown in
FIG. 1
, such ceramic chip antennas include a helical conductor of a single helix structure embedded by printing into a main body composed of a plurality of laminated ceramic sheets. The helical conductor comprises a plurality of first horizontal strip lines
4
a
and a plurality of second horizontal strip lines
4
b
, both of which are thickly printed on the ceramic sheets. The helical conductor further comprises a plurality of vertical strip lines
5
a
and
5
b
that are produced by filling via holes (formed in the ceramic sheets) with conductive material. First horizontal strip lines
4
a
, second horizontal strip lines
4
b
, and vertical strip lines
5
a
and
5
b
are electrically connected to form an integral structure.
However, this single helical conductor structure poses a problem in terms of bandwidth when applied to a wireless communication system. Ceramic chip antenna
100
in
FIG. 1
does not meet the wideband frequency characteristics required by a typical wireless communication system such as a mobile phone, WLAN, Bluetooth etc.
Alternatively, a ceramic chip antenna as shown in
FIG. 2A
is often used to meet the required wideband frequency characteristics of wireless telecommunication systems. Ceramic chip antenna
200
in
FIG. 2A
includes two helical conductors
7
and
8
, which have different axes of helical rotation A, B, respectively. The structure of ceramic chip antenna
200
is further described with reference to FIG.
2
B. First helical conductor
7
is formed by electrically connecting a plurality of first horizontal strip lines
7
a
, which are thickly printed on first ceramic sheet
6
a
, a plurality of vertical strip lines
7
b
, which are produced by filling via holes (not shown) formed in second ceramic sheet
6
b
and third ceramic sheet
6
c
with conductive materials, and a plurality of second horizontal strip lines
7
c
, which are thickly printed on fourth ceramic sheet
6
d
. Similarly, second helical conductor
8
is formed by connecting a plurality of third horizontal strip lines
8
a
, which are thickly printed on first ceramic sheet
6
a
, a plurality of vertical strip lines
8
b
, which are produced by filling via holes (not shown) formed in second ceramic sheet
6
b
and third ceramic sheet
6
c
with conductive materials, and a plurality of fourth horizontal strip lines
8
c
, which are also thickly printed on fourth ceramic sheet
6
d
. Power supplying terminals
9
and
10
are formed on first ceramic sheet
6
a.
As explained above, horizontal strip lines
7
a
,
7
c
,
8
a
and
8
c
are thickly printed on first and fourth ceramic sheets
6
a
and
6
d
to form the two helical conductors, so that the structure of ceramic chip antenna
200
avoids complexity in manufacturing. However, two problems are encountered with ceramic chip antenna
200
: the size of the antenna inevitably becomes large because helical conductors
7
and
8
have different axes of helical rotation A and B from each other; and the structure of the antenna becomes complicated as two power supplying terminals
9
and
10
must be provided.
Accordingly, a need in the art exists to provide a ceramic chip antenna with a simple structure, which can be manufactured in an efficient manner while meeting wideband frequency requirements.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to provide a ceramic chip antenna meeting wideband frequency requirements and having a simple structure for efficient manufacturing.
In accordance with one aspect of the present invention, a ceramic chip antenna is provided that comprises a main body formed by laminating a plurality of ceramic sheets made of a ceramic dielectric material, first and second helical conductors formed inside the main body, and a power supply section coupled to the first and second helical conductors for supplying power thereto, wherein the first and second helical conductors have the same axis of helical rotation as viewed from the power supply section.


REFERENCES:
patent: 6023251 (2000-02-01), Koo et al.
patent: 6650303 (2003-11-01), Kim et al.
patent: 2002/0067312 (2002-06-01), Hilgers
patent: 2002/0118075 (2002-08-01), Ohwada

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