アプリケーションギャラリ

A helical antenna has two major modes. One is normal mode and the other is axial mode. When the helical antenna is operating at the normal mode, its far-field radiation pattern is similar to the torus shaped pattern of a classic dipole antenna. At the axial mode, the helical antenna is resonant at a much higher frequency band than the normal mode operation, and works similarly to an end-fire array along the z-axis and generates a directive radiation pattern. This model analyzes a helical antenna at these two different modes. The S-parameters and far-field patterns are calculated at both operating modes, 385 MHz and 4.77 GHz.