Abstract—In this paper, the design of a single-feed triple-band circularly polarized Spidron fractal slot antenna is presented. The proposed antenna is composed of a Spidron fractal slot, a Z-shaped slit, and two L-shaped slits to realize triple-band circular polarization operation. A simple 50Ω microstrip line is utilized to feed the proposed antenna. A conducting reflector is also used to reduce back radiation, thereby enhancing the forward antenna gain. The proposed antenna has total dimensions of 40.7mm×40.7mm×18.52mm (0.42λ×0.42λ× 0.19λ) and was fabricated and tested. The experimental results show that the proposed antenna has−10 dB reflection coefficient bandwidths from 2.76GHz to 3.13GHz and from 3.56GHz to 6.22GHz. The measured 3 dB axial ratio bandwidths are 2.28 % (3.04–3.11GHz) for the lower band, 7.15 % (4.18–4.49GHz) for the middle band, and 2.6 % (4.93–5.06GHz) for the upper band. The peak gains within the −10 dB reflection coefficient bandwidths are 3.41 dBic and 6.29 dBic, respectively. 1.
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Thi et al. (2013) studied this question.
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