Multiple-element driven array antenna and phasing method
US5479176A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 21, 1994 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Oct 21, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q3/242
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna array for direction-agile applications, such as r.f. packet mesh networks, employs a plurality of quarter-wave radiators disposed normally to a ground plane on a dielectric backing and switching elements for selecting a desired receiving direction and transmission direction and minimizing interference from signals in opposing directions. A control system selects and switches direction rapidly enough to receive and transmit digipeating signals in selected different directions using the phasing and switching elements. A specific embodiment employs eight radiators of 0.2625 electrical wavelengths (quarter wave plus 5%) disposed equidistant along a circle within a circular ground plane in a pattern which is 1/4 wavelength from the outer boundary of the ground plane, each radiator being disposed at least 0.15 wavelengths to about 0.25 wavelengths from adjacent radiators in a circular pattern. The antenna is characterized by eight electronically switchable radiating directions (at 45.degree. intervals) with at least 20 dB front to back ratio and a 3 dB beamwidth of 64.degree.. Pairs of radiators form parasitic elements, driven elements and reflectors with spacing selected as a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.