Radio antenna matching circuit
US6664934B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 2001 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | Sep 21, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/383
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Matching circuit for radio antenna that functions on a two-frequency band which are spaced approximately at a distance of one octave, wherein the upper band is broad. For instance, the first frequency band may be 890-940 MHz and the other band 1710-2200 MHz. The radiator may be a dipole or a monopole over the earth plane, whose bandwidth is sufficient for the first band. The larger bandwidth for the second band is obtained with a transmission circuit that moves and forms the frequency curve stepwise in the Smith chart. When necessary, the matching circuit includes a broadband Balun transformer in addition to said matching circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.