Yagi antenna having matching coaxial cable and driven element impedances
US6307524A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 2000 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Jan 18, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q19/30
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A printed Yagi antenna of the present invention has a circuit board, a driven element having an impedance .OMEGA.d and being printed on the circuit board, a director element printed on the circuit board, a reflector element printed on the circuit board, a microstrip transmission line, and a coaxial cable having and impedance .OMEGA.c. The coaxial cable feeds the driven element via the miscrostrip transmission line and .OMEGA.c is approximately equal to .OMEGA.d. Further, the spacing between the reflector element, the driven element, and director elements are chosen so that an optimum balance is achieved between directional gain and performance sensitivity. The printed Yagi antenna has a partial folded driven element having a J shape which is grounded at the mid-point of the longest portion of the element. The configuration allows for a coaxial cable to be attached directly to the microstrip transmission line without the use of a matching network or balun.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.