Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1997-10-15
1999-04-20
Le, Hoanganh
Communications: radio wave antennas
Antennas
With radio cabinet
343700MS, 343846, H01Q 942, H01Q 124
Patent
active
058961097
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an antenna for radio communication equipment, and more particularly to an antenna for portable radio communication equipment or the like required to be minimized, has high-flexibility in adjustment of impedance and a central frequency in a resonance system of an antenna even if a dimension of the antenna is under certain restrictions, and can flexibly be designed.
BACKGROUND ART
There currently exists various types of panel antenna, such as a reversed L-type of or a reversed F-type of antenna which are small and suitable for incorporation into portable equipment as an antenna for radio communication equipment, for instance, radio equipment and a transceiver each mounted on a vehicle, a cordless telephone set, mobile radio equipment, or portable radio equipment each of which is growing in use for a general purpose.
As improvement in the panel antennas, there has been disclosed configuration of an antenna for radio communication equipment, in Japanese Patent Publication No. HEI 2-55961. The antenna can easily match impedances, in other words, has high-flexibility in adjustment of antenna-impedance, and is well suited for size reduction even if a geometrical dimension of a main component of the antenna and a position for taking out a feeding point are restricted.
FIG. 7 schematically shows the configuration of the conventional type of antenna applied to a cordless telephone set. In FIG. 7, the antenna in the example comprises a conductive main erecting surface section 711 with one edge thereof connected to a shield housing 730 which is a ground conductor and erecting to the other edge thereof by a height H; a conductive main horizontal surface section 712 having a width W with one edge thereof connected to the other edge of the main erecting surface section 711, crossing the main erecting surface 711 at right angles and horizontally extending to the other edge thereof by a length H; a conductive auxiliary erecting linear section 713 with one edge thereof connected to the shield housing 730 via a feeding point 720, and linearly extending to the other edge thereof in parallel to the main horizontal surface section 712; a conductive auxiliary horizontal linear section 714 with one edge thereof connected to the other edge of the auxiliary erecting linear section 713, said conductive auxiliary horizontal linear section linearly extending, at a specified space to the main horizontal surface section 712, to the other edge thereof in parallel to the main horizontal surface section 712; a linking section 715 for electrically connecting the other edge of the auxiliary horizontal linear section 714 to a position of the other edge of the main horizontal surface section 712 or a position at a specified space from the position of the other edge thereof; a first conductor width section 716 having a width t1 provided along the whole length or a portion of the length of the auxiliary horizontal linear section 714 and constituting a capacitor for adjusting impedance; and a second conductor width section 717 having a width t2 provided along a portion of the length of the auxiliary horizontal linear section 714 and constituting a capacitor for adjusting a central frequency.
In the antenna based on the conventional technology described above, impedance can be adjusted by (1) adjusting a distance between the auxiliary horizontal linear section 714 and the main horizontal surface section 712, (2) adjusting a position at which the auxiliary horizontal linear section 714 is connected to the main horizontal surface section 712 via the linking section 715, (3) adjusting a capacity according to a width t1 and a length of the first conductor width section 716, and (4) adjusting a position of forming the second conductor width section 717 according to change in a longitudinal direction of the auxiliary horizontal liner section 714.
Also, in a case where the second conductor width section 717 is provided right under the other edge of the main horizontal surface section 712 in which a vol
REFERENCES:
patent: 4516127 (1985-05-01), Siwiak
patent: 4803491 (1989-02-01), Hikuma
patent: 5148181 (1992-09-01), Yokoyama et al.
patent: 5764190 (1998-06-01), Murch et al.
Electro Communication Society Corporation "Antenna Engineering Handbook", Oct. 30, 1980, pp. 114-117; ISBN 4-274-02677-9.
Hachiga Hitoshi
Ogawa Hideyuki
Yuasa Toshiaki
Le Hoang-anh
Uniden Corp.
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