Earphone antenna and portable radio equipment provided with earphone antenna
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United States of America Patent
Stats
-
May 13, 2008
Grant Date -
Jan 19, 2006
app pub date -
Jun 3, 2005
filing date -
Jun 4, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An earphone antenna includes an audio signal transmission path formed by connecting a first shield wire of a coaxial cable to a ground, connecting a central conductor of the coaxial cable to a pair of first signal lines of an earphone cable via a capacitor which exhibits high impedance in a frequency range of audio signals and low impedance in a frequency range of high frequency signals, and connecting a second signal line and a grounding wire, respectively, to the pair of first signal lines via a high frequency choke which exhibits low impedance in the frequency range of audio signals and high impedance in the frequency range of high frequency signals. Connecting the second shield wire to the ground causes formation of a sleeve antenna by the earphone cable and the second shield wire.
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