Antenna device
US6292154A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1999 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Feb 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/285
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna device includes radiation elements formed on a common antenna board, a feeding unit for feeding the radiation elements, and a ground plate provided in electrically-spaced relation to the radiation elements. The ground plate is mounted on a box-like metal body to form a short-circuit therewith. The radiation elements may have different line lengths for transmitting and receiving a plurality of wavelengths. The feeding unit may include a first radiation element having a different electrical length than a second radiation element, a first feed point for feeding electric power to the first radiation element, and a second feed point for feeding radiation elements are grounded to the ground plate at respective first and second ground points. The difference from the first and second feed points to their respective ground points are different from one another. The antenna device may have a value equal to (H).div.(.LAMBDA.), where (H) is the distance between the radiation elements and the ground plate, and (.LAMBDA.) is a wavelength of at least one frequency transmitted or received by the antenna device, and the distance H satisfies a relationship of 1.div.250.ltoreq.(H).div.(.LA…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.