Date Added: Aug 2012
A novel antenna made of a spiral wire wrapped into a larger helical shape is introduced. The geometry of this antenna, which is a doubly helical structure, is fully described by five independent parameters, including two radial dimensions, two pitch angles, and the number of turns. Radiation properties of this antenna are examined both theoretically and experimentally. The Mat lab software is used to obtain simulation results. A large number of cases with different radii pitch angles, and number of turns is investigated. Results for gain, axial ratio, and bandwidth are presented. The influence of parameters on radiation properties is examined. Several prototypes of the antenna were constructed and tested using an outdoor antenna range.