Multi-frequency slot antenna apparatus
US6664931B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 2002 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Jul 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q5/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A multi-frequency antenna apparatus includes an open-ended slot antenna (20) operable at high frequencies, cascaded in series with a antenna element (22) operable at low frequencies, results in two distinct antennas fed by a single excitation port (33). A U-shaped conductive strip (21) defining the slot antenna (20) has a ground connection (37) at one end near the open-ended side of the slot antenna (20) and a virtual feed point (30) on the other end coupled to the antenna element (22). The electrical length from the ground connection (37) to the feed point is about ¼ of a wavelength of the first frequency creating a virtual open at the feed point (30).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.