Communications: directive radio wave systems and devices (e.g. – Directive – Including a steerable array
Patent
1994-10-21
1995-12-26
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a steerable array
H01Q 302, H01Q 312
Patent
active
054791766
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 modest compromise from the ideal spacing to allow electronically selectable directionality using identically-spaced elements acting as driven elements, parasitic elements and reflector elements. The driven elements are slightly reactively fed.
REFERENCES:
patent: 3725938 (1973-04-01), Black et al.
patent: 3824596 (1974-07-01), Guion et al.
patent: 4099184 (1978-07-01), Rapshys
Allen Kenneth R.
Blum Theodore M.
Metricom, Inc.
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