Electronic scanning of linear slot arrays using diode irises

Semiconductor diodes were employed as electronic iris control elements to scan linear slot arrays atX-band. An iris cluster of four varactor diodes mounted inside the waveguide around each slot provided360degof phase control for slot coupling levels up to -15 dB and a reduced range of phase control for couplings up to -8 dB. Two linear arrays were fabricated with different iris cluster configurations: 1) A ten-slot array, with vertically mounted diodes, electronically scanned sum and difference patterns up to90deg; 2) a five-slot array, with horizontally mounted diodes, scanned sum patterns up to120deg. Both iris configurations had an RF power handling capability of about 0.1 mW.     

A dual-band slot array technique

A technique is discussed for simultaneously operating a waveguide slot array in two different frequency bands to generate two independent radiation patterns. The technique permits frequency separations which differ by a factor up to about 2:1. The technique utilizes the propagation of orthogonal, dominant modes in a rectangular waveguide, each mode operating in a different frequency band. Several linear arrays were investigated atXandK_{mu}band; satisfactory array performance demonstrated the feasibility of the technique.     

Four independent beams from a single linear array

This paper describes an antenna technique which combines the dual-mode operation of a radiating square waveguide transmission line with the attachment of multiple ports to produce an antenna which can generate multiple, independent beams in space. The technique can be used to simultaneously transmit or receive signals through the beams with considerable isolation (>37 dB) between several of the ports. By this technique a single, traveling-wave-operated, linear array was designed to generate four unique beams in space. The beams consisted of two pairs of image beams which were produced by the use of an even coupling function design in the aperture. Measurements made of the array model atX-band showed good agreement with theory.