Communications: radio wave antennas – Antennas – With electrical shield
Reexamination Certificate
1999-08-24
2001-07-10
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
With electrical shield
C343S702000
Reexamination Certificate
active
06259417
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to improvements in portable electronic devices utilizing antennas, and particularly to advantageous aspects of a collinear antenna fed by a coaxial cable that provides omni-directional composite coverage for portable radio equipment and the like.
2. Description of the Prior Art
In recent years, cordless telephones and other portable radio equipment have been put to wide practical use. Portable radio systems typically include a base unit having an antenna mounted to its housing, and a two-way handset radio unit having a second antenna that communicates with the base unit. Such portable radio equipment uses a high-frequency band ranging from 400 MHz to 2.4 gHz. The handset radio unit must operate within the area covered by the base unit to maintain receiving and transmitting functions. The antenna is arguably one of the most important parts of the base and handset units.
It is desirable for the size and weight of the base and handset units to be reduced as much as possible. As the size and weight of the base and handset units are reduced, the antenna must also be reduced in size while maintaining desired electrical characteristics, such as resonance frequency, bandwidth, and gain. Further, the market for portable radio and telephone equipment is highly competitive. As the prices of these products continue to be reduced, it is desirable to use a low-cost antenna with good repeatability and ease of assembly.
SUMMARY OF THE INVENTION
One aspect of the present invention provides an antenna for use with portable radio and telephone equipment. In accordance with this aspect of the invention, there is provided an antenna having a main radiator and a shield plate. One end of the shield plate is attached to the outer conductor of a coaxial cable abutting the shield plate. The main radiator is attached to the inner conductor of the coaxial cable a predetermined distance away from the shield plate The main radiator and shield plate are mounted inside an antenna housing. In accordance with a further aspect of the invention, the shield plate includes a head section having a pair of deformable tabs that form a positioning clip for holding the outer conductor of the coaxial cable. The inner conductor of the coaxial cable extends beyond the positioning clip for attachment to the main radiator.
REFERENCES:
patent: 5617105 (1997-04-01), Tsunekawa et al.
patent: 5926149 (1999-07-01), Rummeli et al.
Kim Brian S.
Muth Edwin A.
Suprunov Peter
Alemu Ephrem
Ho Tan
Lucent Technologies - Inc.
Priest & Goldstein PLLC
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