| 摘要 |
<p>An array of feedhorns feeds detected radiation through waveguides to diode-based mixers to produce modulated intermediate frequency (“IF”) signals. The mixers and waveguides are accommodated on a substrate surface and multiple substrates can be layered up to support a two-dimensional array of waveguide openings in a face of a waveguide/mixer block. A feedhorn block is brought into register with this face so that each waveguide opening connects with a feedhorn. An end portion of each feedhorn is drilled into the opening of a respective waveguide. The main feedhorn block and the waveguide/mixer block are then assembled into registration. This method of construction avoids transverse interfaces in the walls of the feedhorns or waveguides just at the point where the transition is made from one to another.</p> |
