Spiral antenna

Application Number: 00109323
Application Date: 2000.05.26
Publication Number: 1275824
Publication Date: 2000.12.06
Priority Information: 1999/5/27 US 09/321244
International: H01Q1/24;H01Q9/42
Applicant(s) Name: Motorala, Inc.
Inventor(s) Name: Zhou Guangping;Robert Kannon
Patent Agency Code: 11219
Patent Agent: yu mang
Abstract A helix antenna for multi-band operation is achieved according to the present invention by varying the pitch angle, on the helical coil in a suitable manner. In particular, by using an non-uniform pitch angle and keeping the total length of the wire constant, the second resonance of the antenna can be shifted high or low as a function of the pitch angle, while the first resonance is not affected. The diameter of the portions of the helical coil can be varied according to alternate embodiments of the invention.