Waveguide filter with coaxial/waveguide mode conversion

摘要

In order to improve filter loss of a waveguide filter having coaxial/waveguide mode conversion parts at its ends, conductor posts bridging a space between two long sides of the waveguide are provided between the parts and the ends. The conductor posts have sufficient thickness and remain close enough to each other and to short ends of the waveguide that a partition plane including axes of the conductor posts can be regarded as an imaginary short plane. The conductor posts are located so that the partition plane is positioned at a distance lambda /4xn (n=1, 3, 5 . . . ) from the coaxial/waveguide mode conversion part.