| 摘要 |
A radio frequency antenna comprising a waveguide having opposing relatively wide, upper and lower wall portions, a pair of opposing, relatively narrow side wall portions, and a relatively narrow rear wall portion, such portions being connected to provide a cavity having an open end disposed opposite the rear wall portion, the separation between the side wall portions decreasing as such side wall portions extend towards the rear wall portion. The waveguide includes a ridge disposed within the cavity, the decreasingly separated side wall portions of the waveguide being disposed between the ridge and the rear wall portion of the waveguide. The ridge is coupled to a coaxial transmission line. With such arrangement the decreasingly separated side wall portions of the waveguide improve the impedance matching between the coaxial transmission line and the ridged waveguide antenna element, thereby increasing the operating bandwidth of the ridged waveguide antenna element.
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