| http://www.w3.org/ns/prov#value | - A filter as claimed in any one of claims 20, 21 or 22 wherein the cavities have a cylindrical cross-section and each triple mode cavity operates in two TE11(n+1) modes and one TM01n mode and each dual mode cavity operates in two TE11(n+1) modes, where n is a positive integer.
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