Patent ID: 6552636
Filing Date: 2003-04-22
Classification: H01P,H01Q

Abstract:
A cylindrical waveguide comprising:a first waveguide portion having a cylindrical cavity of a predetermined diameter; a second waveguide portion disposed perpendicularly to the first waveguide portion and having a cylindrical cavity of said predetermined diameter; and a connection connecting the first and second waveguide portions with each other and having a bent cylindrical cavity, wherein an inner bent portion of an inner wall portion in the cavity of the connection connects the cavities of the first and second waveguide portions with each other on an inner bent right-angle side and at a first radius from a first central position, while an outer bent portion of the inner wall portion in the cavity of the connection connects the cavities of the first and second waveguide portions with each other on an outer bent right-angle side and at a second radius from a second central position, and the inner bent portion connects the cavities of the first and second waveguide portions with each other in a range from zero to no larger than one-fourth of the predetermined diameter of the respective cavities on each of an extension line of the innermost wall portion in the cavity of the first waveguide portion and an extension line of the innermost wall portion in the cavity of the first waveguide portion and an extension line of the innermost wall portion in the cavity of the second waveguide portion, from an intersecting point of the extension lines; the second radius from the second central position is set 1.5 to 5 times as large as said predetermined diameter, and the cavities of the first and second waveguide portions are connected with each other by the outer bent portion of the inner wall portion in the cavity of the connection; and said first and second central positions lie on a 45Â° line which bisects the bent right-angle side.