Communications: radio wave antennas – Antennas – Logarithmically periodic
Reexamination Certificate
2007-08-14
2007-08-14
Wimer, Michael C. (Department: 2821)
Communications: radio wave antennas
Antennas
Logarithmically periodic
Reexamination Certificate
active
10243444
ABSTRACT:
An antenna includes at least one element whose physical shape is at least partially defined as a second or higher iteration deterministic fractal. The resultant fractal antenna does not rely upon an opening angle for performance, and may be fabricated as a dipole, a vertical, or a quad, among other configurations. The number of resonant frequencies for the fractal antenna increases with iteration number N and more such frequencies are present than in a prior art Euclidean antenna. Further, the resonant frequencies can include non-harmonically related frequencies. At the high frequencies associated with wireless and cellular telephone communications, a second or third iteration, preferably Minkowski fractal antenna is implemented on a printed circuit board that is small enough to fit within the telephone housing. A fractal antenna according to the present invention is substantially smaller than its Euclidean counterpart, yet exhibits at least similar gain, efficiency, SWR, and provides a 50Ω termination impedance without requiring impedance matching.
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McDermott Will & Emery LLP
Wimer Michael C.
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