Antenna device
US6232925A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1999 |
| Grant date | May 15, 2001 |
| Priority date | — |
| Expiry date | Nov 1, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q5/357
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention is for providing an antenna device in a portable radio, capable of transmitting and receiving in frequency bands used in two different communication systems without the performance irregularity even in the case of the mass production. By having the inductance per unit length along the elongating direction of the upper antenna element larger than that of the lower antenna element, the entire antenna element is resonated at a first frequency f.sub.1 as a quarter wave ground antenna element and is also resonated at a second frequency f.sub.2 lower than the frequency three times as much as the first frequency f.sub.1 as a three quarter wave ground antenna. Since the antenna element is formed with an antenna pattern printed on a printed wiring board, antenna elements with the same shape can be obtained, and thus the antenna performance irregularity cannot be generated even in the case of the mass production.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.