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To: Jay Lowe who wrote (6141)	12/7/1999 12:33:00 PM
From: Jay Lowe	Respond to of 12823

Are there any antenna design wizards handy here ... who could comment on this Contrawound Toroidal Helical Antenna (CTHA) ... feasibility and applications? Real or hype? itechfin.com itechfin.com The CTHA provides significant benefits in both in size, performance, cost and form/factor in a variety of wireless applications from 800 MHz to 2.4 GHz. The CTHA for these wireless applications is realized as a printed circuit pattern occupying an area of less that 2inx2in at 800 MHz and less than 1in x 1in at 1.5 GHz (GPS application). The printed circuit CTHA eliminates the standard dipole antenna, thereby reducing the system cost and enhances the wireless system's reliability. The CTHA antenna concept has also been developed for applications at HF, VHF, UHF frequencies In mobile field testing the omnidirectional/isotropic CTHA has demonstrated range improvements of up to 300% compared to monopole antennas and from 500 to 700% in helicopter tests. The size of the CTHA antenna is dramatically smaller than conventional antennas in these applications, for example at 150 MHz, the standard dipole antenna is 6 ft long and the CTHA is realized as a ring with a diameter of 7 inches.