DUAL-MODE (CELL/SAT) HANDSET ANTENNAS

Orbiting satellites in the next millennium will communicate directly with handheld terminals. Handsets switch communications to terrestrial cellular systems (when available) to save connection costs.Dual-mode antennas are needed to fulfill these requirements.Seavey Engineering has developed designs for these MHz frequency combinations:

Circular polarization is used in the higher frequency bands; handset antennas are quadrifilar helices. The cellular antenna utilizes the four quadrifilar helix filaments fed in a common mode rather than in a phase rotation mode. Designs are also available with a cellular wire antenna placed within the quadrifilar helix.Stacked quadrifilars are used for 1.6 and 2.4 GHz operation.For flip phones, innovative patch antennas located in the handset cover have proven successful.These antennas find applications in the Globalstar, Thuraya, ACES, APMT, ASC, Constellation, Ellipso, ICO and Iridium satellite systems.Please contact Seavey Engineering with your specific dual-mode handset antenna requirements.

Patch Elements for "Flip" Phones (8830-800)	Retracting Quadrifilar Cellular/Satellite Antenna (9429-800) (9519-800)
		Satellite Patch (9543-800)