Communications: radio wave antennas – Antennas – High frequency type loops
Reexamination Certificate
1999-08-12
2001-10-09
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
High frequency type loops
C343S702000, C343S895000
Reexamination Certificate
active
06300914
ABSTRACT:
FIELD OF THE INVENTION
This invention relates in general to reduced size broadband antennas for wireless communication systems and other wireless applications. More specifically, the invention relates to a fractal loop antenna that includes a plurality of fractal elements. The fractal elements are connected either in cascade, series or parallel.
BACKGROUND OF THE INVENTION
Wideband antennas for wireless low frequency band reception are well known in the art. With the advance of new generation of wireless communication systems and the increasing importance of other wireless applications, low profile wideband antennas are in great demand in both commercial and military applications. Multi-band and wideband antennas are desirable for personal communication systems, small satellite communication terminals, and other wireless applications. Wideband antennas also find applications in Unmanned Aerial Vehicles (UAVs) when they are embedded into the airframe structure, in Counter Camouflage, Concealment and Deception (CC&D), Synthetic Aperture Radar (SAR), and Ground Moving Target Indicators (GMTI).
Traditionally, wideband antennas in wireless low frequency band can only be achieved with heavily loaded wire antennas, which means that a different antenna is needed for each frequency band. As a result, these antennas are large in size and they are cumbersome and bulky for personal mobile use. It would therefore be desirable to provide an antenna structure that overcomes the deficiencies of conventional antenna structures.
SUMMARY OF THE INVENTION
The present invention provides a reduced size wideband antenna, in which a single compact antenna structure operates at multiple frequency bands. The antenna is composed of a plurality of fractal elements, each of which repeats a specific geometric shape. The fractal elements can be formed in the same plane or formed in multiple planes to provide a three dimensional antenna structure.
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D. Werner et al., “Fractal Constructions of Linear and Planar Arrays”, 3/97, pp. 1968-1971, 1997 IEEE.
D. Jaggard et al., “Cantor Ring Arrays”, 2/98, pp. 866-869, 1998 IEEE.
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APTI Inc.
Rossi & Associates
Tran Thuy Vinh
Wong Don
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