Helical antenna structure in a mobile terminal

Details Helical antenna structure in a mobile terminal Helical antenna structure in a mobile terminal

2001-09-06

2003-07-15

Clinger, James (Department: 2821)

Communications: radio wave antennas

Antennas

Spiral or helical type

C343S702000

Reexamination Certificate

active

06593899

ABSTRACT:

PRIORITY
This application claims priority to an application entitled “Helical Antenna Structure in Mobile Terminal” filed in the Korean Industrial Property Office on Oct. 18, 2000 and assigned Serial No. 2000-61250, the contents of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a mobile terminal, and in particular, to an antenna structure in a mobile terminal.
2. Description of the Related Art
In general, a mobile terminal has a helical antenna formed in an outward protrusion and a whip antenna. When the whip antenna is contained in the mobile terminal, the helical antenna is operational, and when the whip antenna is extended, the whip antenna is operational.
FIGS. 1A and 1B
illustrate the operations of antennas in a conventional mobile terminal. When a whip antenna
100
is contained in the terminal as shown in
FIG. 1A
, an RF signal is transmitted/received through a helical antenna
102
formed within a cap
106
which protrudes outward from a terminal
104
. When the whip antenna
100
is pulled out as shown in
FIG. 1B
, the RF signal is transmitted/received through the whip antenna
100
.
As shown in
FIGS. 1A and 1B
, the helical antenna is comprised of a winding coil and a cap covering the winding coil. The diameter of a top part TP equals that of a bottom part BP in the winding coil. Since the cylindrical winding coil is near to the outer surface of the cap, the helical antenna is significantly affected when it makes contact with a human body.
When the helical antenna operates, a high voltage is induced to the top part TP of the winding coil, and therefore this high voltage contacts cap
106
adjacent to the top part TP and a human body greatly influences the antenna's characteristics.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a helical antenna structure, where the influence of a human body on the antenna's characteristics is prevented in a mobile terminal.
To achieve the above object, there is provided a helical antenna structure of a mobile terminal, which is minimally influenced by a human body. In the helical antenna structure, a cap protrudes from the upper end of the mobile terminal, and a winding coil is formed within the cap, which is spaced from an outer surface of the cap substantially the same distance from a bottom part of the cap to a top part of the cap.


REFERENCES:
patent: 6166707 (2000-12-01), Painter et al.
patent: 6292156 (2001-09-01), Openlander
patent: 6300913 (2001-10-01), Davidson

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