A coaxial band pass filter at S-band comprising a 50-ohm coaxial structure with two GR connectors fitted to its ends for providing a frequency response with the higher cut-oil frequency of 3.7 GHz and the lower cut-off frequency of 2.1 GHz wherein the outer conductor of the said structure is made of a cylindrical brass tube and the inner conductor consist of nine pieces of cylindrical brass rods arranged colinearly, two consecutive rods being separated from each other with the help of a teflon disc whereas all the parts of the inner conductor are rigidly held coaxially inside the said outer conductor with the help of a teflon tube which serves as the dielectric medium of the coaxial structure.
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