Helical antennas
US4148030A · kind A · utility
35Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1977 |
| Grant date | Apr 3, 1979 |
| Priority date | — |
| Expiry date | Jun 13, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/08
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A plurality of coaxially wound, untuned helical antennas have a pitch that is a function of displacement along the axis of the antennas. The untuned antennas may be excited by signals that have a selected phase shift therebetween. The excitation causes an additive combining of electromagnetic waves radiated by the untuned antennas. The helical antennas may be tuned to radiate the waves in respective bands of frequencies, thereby simultaneously providing filtering and radiation characteristics that make the tuned antennas suitable for frequency diplexing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.