Abstract: Close tolerance waveguide assemblies for use in antenna arrays is disclosed. In particular, the waveguide assemblies are configured along the zero electrical current lines in the antenna array. Such waveguides are particularly useful in antenna arrays for radar systems operating at the microwave and millimeter-wave frequencies. In the invention, antenna array assemblies, such as rectangular or ridged waveguide assemblies, are configured by combining plates which are formed into a plurality of equal length members protruding from and perpendicularly disposed to a structural member, wherein each such protruding member has two formed or unformed ends.