Antenna apparatus
US6337668B1 · kind B1 · utility
156Cited by
12References
35Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2000 |
| Grant date | Jan 8, 2002 |
| Priority date | — |
| Expiry date | Feb 28, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/29
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.