Ultra-short helical antenna and array thereof
US6172655A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 12, 1999 |
| Grant date | Jan 9, 2001 |
| Priority date | — |
| Expiry date | Feb 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/067
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A short axial-mode helical antenna (10) includes a winding (12) including a conductor (20) helically wound about an axis (8). A first portion (22) of the winding is wound with a first pitch (.alpha.) on a segment of a cone (41) having a smaller diameter (D1) at a plane (31) adjacent a ground plane (14), and a larger diameter (D2) at a second plane (32) parallel with the ground plane and remote therefrom. A second portion (24) of the winding (12) is wound with a second pitch (.beta.) on a segment of a second cone (42) coaxial with the first cone, and having its smaller diameter (D3) at a third plane (33) parallel with the first and second planes. The antenna provides higher gain than a straight uniform, tapered-end, continuous taped, or nonuniform-diameter helical antenna of equal length, and consequently has less mutual coupling when mounted in an array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.