| 摘要 |
<p>A hollow waveguide directional coupler comprises two hollow waveguide Sections (3,4) that are coupled to each other by a plurality of coupling openings (6,7) formed in a wall (5) extending between the hollow waveguide sections (3,4). Two adjacent coupling openings (6,7) have a distance of 3λg/4 from each other, λg being the wavelength of the nominal centre frequency of the operating frequency range of the directional coupler.</p> |
