Waveguide slot antenna
View Patent ↗The present invention provides a waveguide slot antenna which utilizes a waveguide as a feeding line and has a linear-shaped slot provided in a wall of the waveguide. The waveguide slot antenna is characterized in that it comprises a pair of polarized wave conversion members surrounding an outer periphery of the slot and divided by a slit intersecting the slot. The present invention can provide a waveguide slot antenna capable of radiating a circularly polarized wave with a satisfactory axial ratio characteristic, over a wide band, only by adding a simple component to a conventional waveguide slot antenna.
1. A waveguide slot antenna utilizing a waveguide as a feeding line and having a linear slot provided in a wall of the waveguide, the waveguide slot antenna comprising a pair of polarized wave conversion members surrounding an outer periphery of the slot and divided by a slit intersecting the slot.
2. The waveguide slot antenna as defined in claim 1 , wherein each of the polarized wave conversion members has a height dimension which is 0.2 to 0.3 times a length of a wavelength of use.
3. The waveguide slot antenna as defined in claim 2 , wherein the polarized wave conversion members are arranged within one-half of the wavelength, with respect to a center of the slot.
4. The waveguide slot antenna as defined in claim 3 , wherein the waveguide is a hollow waveguide or a dielectric waveguide.
5. An array antenna device comprising the waveguide slot antenna as defined in claim 1 .