Compact top-loaded, tunable fractal antenna systems for efficient ultrabroadband aircraft operation
US7746282B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2008 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Oct 29, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q9/40
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Compact top-loaded, fractal monopole antenna system embodiments are provided for multi-band airborne operation over ultrabroadband ranges (e.g., 30 to 2000 MHz). These multi-band embodiments are self-contained, aerodynamic and compact (e.g., blade height less than 9.5 inches) and are power efficient with a low return loss (e.g., less than −7 dB). System embodiments include a set of impedance-matching circuits configured to substantially match an antenna impedance to a predetermined system impedance over a set of predetermined frequency bands. In an embodiment, at least one impedance-matching circuit includes a chain of selectable air-core inductors which are novelly arranged to improve radiation efficiency and prevent damage to support substrates. In an embodiment, a lowest-frequency one of the impedance-matching circuits is configured to process signals having a maximum wavelength λmax wherein a fractal member is configured with a length that does not exceed λmax/40. System embodiments are configured to respond to a variety of existing radio systems that send commands via different encoding formats.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.