Two-part folded waveguide having a sinusoidal shape channel including horn shape radiating slots formed therein which are spaced apart by one-half wavelength

A method, the method comprising:

• manufacturing two parts of a two-part folded waveguide with horns having multiple surfaces that define a channel for a desired wavelength λ, by at least:
• forming a first part of the waveguide such that the first part includes:
• a first surface from the multiple surfaces, the first surface having:
• a sinusoidal shape that folds back and forth about a longitudinal axis that extends in a longitudinal direction through the channel;
• and
• a plurality of radiation slots, each of the radiation slots in a shape of a horn that forms a respective hole extending through the first surface and into the channel, wherein a common distance between each horn along the longitudinal axis is one half the desired wavelength λ;
• at least one second surface from the multiple surfaces, the second surface being perpendicular to the first surface to define an upper half of walls of the channel that are normal to the first surface;
• and
• one end of the first part defining a portion of a rectangular opening in the longitudinal direction and extending through to the channel;
• forming a second part of the waveguide such that the second part of the waveguide includes:
• a third surface from the multiple surfaces, the third surface having the same sinusoidal shape as the first surface;
• at least one fourth surface from the multiple surfaces, the fourth surface being perpendicular to the third surface, the fourth surface defining a lower half of the walls of the channel;
• and
• one end of the second part defining a remaining portion of the rectangular opening that is not defined by the first part;
• and
• arranging the second part of the waveguide to be adjacent to and parallel with the first part of the waveguide by:
• orientating the first part of the waveguide with the second part of the waveguide to align the portion of the rectangular opening with the remaining portion of the rectangular opening;
• and
• aligning the upper half of the walls of the channel that are normal to the first surface of the first part of the waveguide with the lower half of the walls of the channel that are perpendicular to the third surface to cause the sinusoidal shape of the first and second parts of the waveguide to be aligned in parallel.