In an ultrawide-band linear-circular polarization converter, in a noncircular waveguide (1) which has negative-phase characteristics in which a phase gradually decreases in accordance with an increase in a frequency over a ultrawide-band frequency range, a dielectric structure (2) which has positive-phase characteristics, in which a phase gradually increases in accordance with an increase in a frequency, having a complementary relationship with the negative-phase characteristics in the ultrawide-band frequency range is provided.
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