Antenna switching circuit suitable for a radio-frequency apparatus with a built-in antenna
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United States of America Patent
Stats
-
Sep 1, 1998
Grant Date -
N/A
app pub date -
Jul 13, 1995
filing date -
Dec 19, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An antenna switching circuit for a portable radio-frequency apparatus, such as a portable telephone, provides an antenna switching circuit which enables switching of a radio-frequency signal path passing through an antenna, between a built-in antenna and an external antenna, and which increases the degree of freedom in arranging the components of the apparatus, which comprises a built-in antenna 3, an external-antenna connector 2a and a radio-frequency cable 6 serving as a path for radio-frequency signals, with an electrical control switch 11 for selecting either the built-in antenna 3 or the external-antenna connector 2a.
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