Compact antenna and producing method thereof

Details Compact antenna and producing method thereof Compact antenna and producing method thereof

2001-12-17

2003-10-07

Nguyen, Hoang (Department: 2821)

Communications: radio wave antennas

Antennas

With housing or protective covering

C343S7000MS, C343S895000

Reexamination Certificate

active

06630911

ABSTRACT:

BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The present invention relates to a compact antenna used for a portable terminal, and to a producing method of the compact antenna.
FIG. 26
show an outline structure of a conventional compact antenna used for a portable terminal. An antenna
301
shown in
FIG. 26A
has a meander-shaped radiating section
301
a
, and the radiating section
301
a
is surrounded by a dielectric
301
b
. The radiating section
301
a
is continuously formed with a terminal
301
c
to be connected to a circuit board. Similarly, a compact antenna
302
shown in
FIG. 26B
has a helical-shaped radiating section
302
a
surrounded by a dielectric
302
b
. The radiating section
302
a
is continuously formed with a terminal
302
c.
To enhance the radiation efficiency of the antennas, it is necessary to enhance the electric conductivity of each of the radiating sections
301
a
and
302
a
as high as possible. That is, if the electric conductivity of each of the radiating sections
301
a
and
302
a
is low, a rate of electric power supplied to the radiating sections
301
a
and
302
a
which becomes thermal energy and is lost is increased. Therefore, it is preferable that the electric conductivity is as high as possible.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a compact antenna capable of enhancing the radiation efficiency.
It is another object of this invention to provide a compact antenna capable of being mounted strongly to a circuit board, and to provide a producing method of the compact antenna.
According to one aspect of the invention, a compact antenna comprises an antenna conductor having a bent linear core, and a connection film which covers at least a portion of an outer surface of the core and which has higher electric conductivity than that of the core.
The connection film has a film thickness equal to or greater than a skin depth &dgr; specified by the following equation:
&dgr;=(2/(&sgr;·&mgr;·&ohgr;)),
Wherein &sgr; is electric conductivity of the conductor, &mgr; is magnetic permeability and &ohgr; is angular frequency.
According to another aspect of the invention, a compact antenna having an antenna conductor comprises a radiating section for sending and receiving radio wave, and a terminal for connecting the radiating section and a circuit board, the terminal is coated with a connection film for enhancing soldering characteristic, and the radiating section is not formed with the connection film.
According to still another aspect of the invention, a producing method of a compact antenna comprises a stamping step in which an antenna conductor comprising a radiating section for sending and receiving radio wave and a terminal for connecting the radiating section to a circuit board is formed by stamping a metal plate, a coating step which coats the radiating section with dielectric, and a connection film forming step in which the connection film is selectively formed for the terminal using the dielectric as a mask.
Other objects and features of this invention will become understood from the following description with reference to the accompanying drawings.


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