Abstract: An adjustable coupling arrangement for aperture coupled cavity filters. According to the invention, in an electric wall (24) separating two cavities to be coupled in a bandpass filter, provide a cruciform iris (26) comprising a central aperture (27) having four slits (28,29,30, 31) extending outwardly therefrom. In each slit there is arranged a captive movable rectangular metal slug (36,37,38,39) whose position along the slit's length can be manipulated by a tool that engages the slug when the tool is introduced into a radial passageway (32,33,34 35) that connects the slit with an access hole in the filter's housing. When desired coupling parameters are achieved by manipulating each of the slugs to effectively change the electrical length of the slits, each slug is locked in position by a respective associated locking means actuated by the tool. Because a significant part of the tool is within a passageway during manipulation, the filter's characteristics are not disturbed by its presence.

Abstract: An adjustable coupling arrangement for aperture coupled cavity filters. According to the invention, in an electric wall (24) separating two cavities to be coupled in a bandpass filter, provide a cruciform iris (26) comprising a central aperture (27) having four slits (28,29,30, 31) extending outwardly therefrom. In each slit there is arranged a captive movable rectangular metal slug (36,37,38,39) whose position along the slit's length can be manipulated by a tool that engages the slug when the tool is introduced into a radial passageway (32,33,34 35) that connects the slit with an access hole in the filter's housing. When desired coupling parameters are achieved by manipulating each of the slugs to effectively change the electrical length of the slits, each slug is locked in position by a respective associated locking means actuated by the tool. Because a significant part of the tool is within a passageway during manipulation, the filter's characteristics are not disturbed by its presence.