To suppress the occurrence of a vertically polarized wave component while suppressing the mass and manufacturing cost of an antenna.
In the slot antenna 100, the distance along the footprint portion between the parallel portion of a supporting portion 26 and one side of the H-face portion of a waveguide 12 opposing the parallel portion is adjusted such that the amplitude of the vertically polarized wave component of a first radio wave radiated from a slot becomes equal to the total of amplitude of a second radio wave radiated from the footprint portion. The distance along the H-face portion between the footprint portion of the supporting portion 26 and the E-face where the slot is provided is adjusted such that the phases of the second radio waves are equalized while having such a relation as the phases of the vertically polarized wave component of the first radio wave and the second radio wave are inverted. The supporting portion 26 fixes a metal for retaining the supporting portion 26 and the waveguide 12 such that no air gap exist between. A conductive substance may be inserted between the supporting portion 26 and the waveguide 12.
| JP3623079 | Dielectric filter and its manufacturing method |
| JP2015089091 | METHOD OF MANUFACTURING MODE CONVERTER |
YOUNG JOHN
SUGANO MASAYUKI
MARUYAMA RYOICHI
