volume | PIER Journals

Abstract

Circularly arced Koch fractal curve (CAKC) is originally proposed. Then, a novel wire dipole is formed with Ki-iterated CAKC. The dipole is experimentally studied for fractal electrical characteristics revealing. It manifests many unique properties, such as multiband resonance at odd times of half-wavelength. In particular, it unprecedentedly presents normal mode (0.5.λ) and axial mode (1.5.λ) simultaneously. Thus, K₂ CAKC wire is configured into folded monopole with circular disc ground for omni-directional and directive radiation. Five matched bands (S₁₁≤-10 dB) are obtained within 1 GHz-10 GHz, of which f₁=1.31 GHz, f₂=3.14 GHz, f₃=3.63 GHz, f₄=4.65 GHz, and f₅=7.71 GHz. Compared with conventional wire monopole (0.25.λ), this fractal monopole shows 31% height reduction. It has dipole-like patterns at f₁ and f₂, endfire patterns at f₃ and f₄ with high gain (10 dBi), and off-endfire patterns at f₅. Moreover, the fractal antenna possesses compactness, lightweight, simplicity, and low cost. So, it is an attractive candidate for multiband and multifunction antennas, such as satellite antennas, of which omni-directional normal mode and directive axial mode are needed for beaconing and communication respectively.

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Dr. Daotie Li

Dr. Jun-Fa Mao