The embodiment of the invention discloses a
broadband helical antenna and a design method thereof. The antenna comprises a
hollow cylinder and a spiral
metal wire, wherein the inner layer of the
hollow cylinder is a
metal ground, the outer layer of the
hollow cylinder is a magnetic material, the spiral
metal wire is wound on the outer side of the magnetic material, the spiral metal wire is furtherprovided with a feeding point and a
short circuit point, and the
short circuit point is used for conducting the spiral metal wire and the metal ground. According to the
broadband helical antenna provided by the embodiment of the invention, the
short circuit point is added, the
helical metal wire and the metal ground are connected, the
current distribution can be changed, a new current path is formed to form a new
radiation oscillator, a plurality of
resonance modes are excited in a
frequency band of 10-80MHz, a multi-band and
broadband antenna is formed, and the broadband
helical antenna hasa wide bandwidth. The antenna provided by the embodiment of the invention further comprises a
radio frequency switch which is used for adjusting the disconnection or connection state of the short circuit
metal sheet and the disconnection or connection state of the spiral metal wire so as to adjust the resonant frequency.