Rectangular waveguide

Claim 1

A RECTANGULAR WAVEGUIDE FOR ELECTROMAGNETIC WAVE TRANSMISSION COMPRISING, IN COMBINATION, INNER WALL MEANS OF ELECTRICALLY CONDUCTIVE SHEET METAL DEFINING A CHANNEL OF SUBSTANTIALLY RECTANGULAR CROSS SECTION HAVING FOUR WALL PORTIONS AND A PLURALITY OF CORRESPONDING EDGE PORTIONS EACH LOCATED BETWEEN TWO ADJOINING WALL PORTIONS, SAID WALL PORTIONS HAVING AN INNER AND AN OUTER FACE; OUTER WALL MEANS COMPOSED OF A PLURALITY OF ELONGATED MEMBERS EACH HAVING A SUBSTANTIALLY RECTANGULAR CROSS SECTION, EACH MEMBER EXTENDING ALONG THE OUTER FACE OF A DIFFERENT ONE OF SAID WALL PORTION BETWEEN SAID EDGE PORTIONS THEREOF, LEAVING ALONG EACH OF SAID EDGE PORTIONS A FREE SPACE BETWEEN ADJACENT ONES OF SAID MEMBERS, EACH OF SAID MEMBERS CONSISTING OF AN INNER LAYER MEANS COMPOSED OF A RIGID HONEYCOMB BODY HAVING A PLURALITY OF ELONGATED CELLS SUBSTANTIALLY PERPENDICULAR TO THE PLANE OF THE RESPECTIVE ONE OF SAID WALL PORTIONS, AND AN OUTER SHEET METAL PLATE MEANS, SAID OUTER SHEET METAL PLATE MEANS AND SAID INNER LAYER MEANS BEING FIRMLY ATTACHED TO EACH OTHER, SAID INNER LAYER MEANS BEING ALSO ATTACHED TO THE OUTER FACE OF THE RESPECTIVE WALL PORTION; ELONGATED REINFORCEMENT MEMBERS FITTING SAID FREE SPACES AND HAVING A FIRST PORTION IN ENGAGEMENT WITH SAID INNER WALL MEANS AND A SECOND PORTION IN ENGAGEMENT WITH SAID OUTER SHEET METAL PLATE MEANS SO THAT EVEN IN THE CASE OF LARGE WAVE GUIDE DIMENSIONS A COMPARATIVELY THIN INNER WALL MEANS IS MECHANICALLY REINFORCED BY LIGHT WEIGHT LAYERS OF SAID OUTER WALL MEANS ATTACHED TO EACH END OF MEMBERS; AND FLANGE MEANS ATTACHED TO EACH END OF SAID INNER AND OUTER WALL MEANS, EACH FLANGE MEANS INCLUDING AN INNER PORTION AND OUTER PORTION, THE INNER PORTION BEING ATTACHED TO SAID INNER WALL MEANS, THE OUTER PORTION BEING ATTACHED TO SAID OUTER WALL MEANS, AND SAID INNER AND OUTER PORTIONS OF EACH FLANGE MEANS BEING ASSEMBLED WITH EACH OTHER.