A two-wire Archimedean spiral antenna with a parasitic loop and a reflector

A loosely wound spiral antenna with a small number of turns and a reflector is investigated numerically. It is shown that the antenna gain and axial ratio depends on the reflector size, spiral rate of growth, and number of turns. In addition, a spiral antenna with a reflector and parasitic loop is proposed to improve the antenna gain and axial ratio. Improvement of the antenna gain is achieved, while keeping the loop radius the same size as the reflector.<>