Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1997-11-07
2000-08-15
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With radio cabinet
343741, 3437925, 343787, 343806, 343846, H01Q 124, H01Q 136
Patent
active
061043494
ABSTRACT:
A first fractal antenna of iteration N.gtoreq.2 in free space exhibits characteristics including at least one resonant frequency and bandwidth. Spacing-apart the first fractal conductive element from a conductive element by a distance .DELTA., non-planarly or otherwise, preferably .ltoreq.0.05.lambda. for non-planar separation for frequencies of interest decreases resonant frequency and/or introduces new resonant frequencies, widens the bandwidth, or both, for the resultant antenna system. The conductive element may itself be a fractal antenna, which if rotated relative to the first fractal antenna will alter or tune at least one characteristic of the antenna system. Forming a cut anywhere in the first fractal antenna causes new and different resonant nodes to appear. The antenna system may be tuned by cutting-off a portion of the first fractal antenna, typically increasing resonant frequency. A region of ground plane may be formed adjacent the antenna system, to form a sandwich-like system that is readily tuned. Resonator systems as well as antenna systems may be tuned using is disclosed methodology.
REFERENCES:
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patent: 3810183 (1974-05-01), Krutsinger et al.
patent: 3811128 (1974-05-01), Munson
patent: 4318109 (1982-03-01), Weathers
patent: 5164738 (1992-11-01), Walter et al.
Pfeiffer, A., "The Pfeiffer Quad Antenna System", QST, pp. 28-30 (1994).
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