Antenna device and radio equipment having the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 8, 2002
Grant Date -
Apr 18, 2002
app pub date -
Aug 2, 2001
filing date -
Aug 24, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An LC parallel resonance circuit is connected in series with the power supply side of the antenna conductor portion. The antenna conductor portion is configured so as to resonate at a frequency slightly lower than the center frequency in the higher frequency band of two frequency bands for transmitting and receiving radio waves. The LC parallel resonance circuit is configured so as to resonate substantially at the center frequency in the lower frequency band for transmitting and receiving a radio wave and be capable of providing to the antenna conductor portion a capacitance for causing the antenna conductor portion to resonate at the center frequency in the higher frequency band. Thus, a circuit for changing the upper and lower frequency bands is not needed. Such a change-over circuit, which is complicated, causes problems in that the conduction loss increases, and the antenna sensitivity deteriorates. Without need of the change-over circuit, the conduction loss can be reduced, the antenna sensitivity can be enhanced and costs can be reduced.
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