Which waveguide antenna is more suited for one-dimensional scanning than scanning in two coordinates?

The waveguide slot array is particularly suited for one-dimensional scanning due to its design, which allows for the manipulation of the radiated beam primarily along one axis. The configuration of the slots in the waveguide enables efficient phase control and thus facilitates electronic scanning in a linear direction.

In the context of one-dimensional scanning, the waveguide slot array can achieve a greater degree of precision and control over the direction of radiation. This is primarily because the array can be designed to adjust the phase of the emitted waves easily, allowing for rapid changes in direction along a single plane.

In contrast, other options such as the dual feedhorn and twelve feedhorn are more complex and typically aim for broader scanning capabilities that might include both dimensions, but they generally do not offer the same level of efficiency for one-dimensional scanning as a waveguide slot array. The truncated paraboloid, while effective in certain applications, is more fixed in its geometry and design, limiting its adaptability for focused one-dimensional scanning tasks.