| 摘要 |
A circular polarizer includes a low frequency band waveguide (fL), a high frequency band waveguide (fH) formed at the inner side of the low frequency band waveguide (fL) in a coaxial structure, and a dielectric member provided to abut against the inner side of the low frequency band waveguide (fL) and the outer side of the high frequency band waveguide (fH), and inclined by 45° with respect to a linear plane of polarization. Since the dielectric member is provided at an angle of 45° with respect to the linear plane of polarization, the delay of the phase of the electric field passing through the dielectric member becomes greater than the phase of the electric field orthogonal to the dielectric member, whereby a circularly polarized wave can be converted into a linearly polarized wave. Since the dielectric member can be formed by a mold, a circular polarizer that is economic and fit for mass production can be provided. Adjustment of the phase characteristics and the like is no longer required since the shape of the dielectric member can be determined by experiments.
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