Antenna apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jan 8, 2002
Grant Date -
N/A
app pub date -
Feb 28, 2000
filing date -
Mar 5, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The antenna apparatus of the present invention places antenna element 302 that transmits or receives electromagnetic waves on basic plate 301, places parasitic antenna elements 303 to 306 on basic plate 301 evenly spaced concentrically centered on antenna element 302, places switch elements 307 to 310 and capacitances 311 to 314 in parallel between one end of each of antenna elements 303 to 306 and said basic plate and disconnects one of switch elements 307 to 310 and connects all the others. In this way, the present invention provides a small and high-gain antenna apparatus with directivity switching capability.
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