A novel patch antenna with a fractal boundary condition is proposed. Experimental and numerical results corroborate the fact that the fractal characteristic of the perimeter produces localised modes. This property is utilised in the design of a microstrip patch antenna with a measured directivity of 12.7 dB.
Borja, C., Font, G., Blanch, S., Romeu, J. High directivity fractal boundary microstrip patch antenna. "Electronics Letters", Maig 2000, vol. 36, núm. 9, p. 778-779.