An ultra-wideband loop antenna is proposed that is based on a wavelength loop antenna and a slot antenna. The self-complementary principle is applied to the designed ultra-wideband antenna. The antenna operates as a loop antenna in the low frequency band (0.3–1 GHz) and as a slot antenna in the high frequency band (1–14.2 GHz). The measured −10 dB bandwidth is 47.3:1 (0.3–14.2 GHz), and the size of the antenna is 220(0.22λL)×220(0.22λL)×177(0.18λL) mm3, where λL is the wavelength of 0.3 GHz.
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Yoon et al. (2010) studied this question.
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