Patent ID: 8717123

Claim:
A coaxial mirror for reflecting an electromagnetic signal in a narrow band filter, said mirror comprising: an outer pipe bounded by a first envelope between initial and final terminals that define a first cavity, wherein an input port attaches upstream to said initial terminal and an outlet port attaches downstream to said final terminal; an inner pipe bounded by a second envelope between a closed fore end and an open aft end adjacent said final terminal, said inner pipe being coaxially disposed between said initial and final terminals within said first envelope to form an annular conduit; a first rod, coaxially disposed within said first envelope, extending from said input port to said fore end; a conductor, coaxially disposed within said second envelope, extending from said fore end to an axial location between said fore and aft ends; and a second rod, coaxially disposed within said inner pipe, extending from said axial location to said final terminal, wherein said input port receives the electromagnetic signal, said outer pipe passes the electromagnetic signal within said first envelope along said annular conduit to said open aft end of said inner pipe, said inner pipe reverses the electromagnetic signal from said open aft end to said closed fore end, said conductor passes the electromagnetic signal from said closed fore end, said second rod passes the electromagnetic signal from said conductor to said final terminal, and said outlet port transmits the electromagnetic signal.