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Fractal spiral monopoles: theoretical analysis and bandwidth optimization

Spiral antennas are characterized by low resonant frequencies and broadband matching for high frequencies. We present in this work a theoretical analysis and optimization of a special type of spiral antenna, namely the fractal spiral monopole (FSM). In the low frequencies in the range 0<L//spl lambda/<1 (L is the height of the monopole and /spl lambda/ the wavelength), variation of the resonant frequencies in function of the monopole's dimensions was investigated. In the high frequencies in the range 0<L//spl lambda/<3, the monopole's dimensions were optimized in order to obtain broadband matching. The method of moments (MoM) was used for calculations.