Portable radio communication device

Details Portable radio communication device Portable radio communication device

H - Electricity

01

Q

H01Q 21/24 (2006.01) H01Q 1/24 (2006.01) H01Q 1/36 (2006.01) H01Q 11/08 (2006.01) H01Q 21/29 (2006.01) H01Q 25/04 (2006.01) H04B 1/38 (2006.01) H04B 7/00 (2006.01) H04B 7/185 (2006.01)

Patent

CA 2233600

A small-sized flat antenna mounted on a portable radio communication device is available for a narrow bandwidth, and the resonance frequency of the flat antenna varies due to interference between the flat antenna and surrounding dielectrics such as a housing and a human body. As a result, the transmission efficiency and reception sensitivity of the antenna have been impaired. A communicating section (constructed of a coaxial line or a microstrip line) is arranged in a portable radio communication device having a circularly polarized antenna for satellite communication, so that an appropriate distance is provided not only between a housing of the portable radio communication device and the antenna but also between a human body and the antenna.

Une antenne plane de petite taille fixée à un dispositif radio portable est destinée uniquement à une bande étroite. Par conséquent, la fréquence de résonance de l'antenne fluctue en raison de l'interaction entre ladite antenne et un diélectrique périphérique, tel qu'un boîtier, le corps de l'utilisateur, etc. et l'efficacité d'émission ainsi que la sensibilité de réception de l'antenne sont faibles. Pour résoudre ce problème, une section de communication (composée d'une ligne coaxiale ou d'une ligne microrubans) est placée dans le dispositif radio portable et une antenne à polarisation circulaire pour la communication par satellite est fixée à la section de communication afin de garantir la distance entre le boîtier et l'antenne et entre le corps de l'utilisateur et l'antenne.

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