US Patent No: 5,801,661
Number of patents in Portfolio can not be more than 2000
Antenna switching circuit suitable for a radio-frequency apparatus with a built-in antenna
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Sep 1, 1998
Issued date -
Jul 13, 1995
filing date -
08/502,176
serial no -
Expired
status
Importance
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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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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,958,382 Radio transceiver apparatus for changing over between antennas | 40 | 1989 | |
| 5,121,504 Mobile radio telephone device with a detachable adapter for external power and antenna connection | 25 | 1989 | |
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| 5,255,001 Antenna system for portable radio apparatus | 23 | 1990 | |