Spiral mode selector circuit for a twowire archimedean spiral antenna

Claim 1

A SELECTIVE MODE SPIRAL ANTENNA SYSTEM WHICH IS ADAPTED TO RADIATE IN EITHER ODD OR EVEN MODES ALTERNATELY OR BOTH ODD AND EVEN MODES SIMULTANEOUSLY COMPRISING A TWO-WIRE ARCHIMEDEAN SPIRAL ANTENNA HAVING TWO INPUT TERMINALS; A RING NETWORK HAVING TWO OUTPUT TERMINALS, A FIRST INPUT TERMINAL WHICH PASSES APPLIED CURRENT TO SAID OUTPUT TERMINALS IN PHASE OPPOSITION, AND A SECOND INPUT TERMINAL WHICH PASSES APPLIED CURRENT TO SAID OUTPUT TERMINALS IN PHASE, TWO COAXIAL CABLES EACH HAVING AN OUTER CONDUCTOR AND AN INNER CONDUCTOR, SAID INNER CONDUCTORS BEING ELECTRICALLY CONNECTED BETWEEN THE OUTPUT TERMINALS OF SAID RING NETWORK AND THE INPUT TERMINALS OF SAID SPIRAL ANTENNA; A METAL GROUND PLANE INTERPOSED BETWEEN SAID RING NETWORK AND SAID SPIRAL ANTENNA, SAID OUTER CONDUCTORS BEING ELECTRICALLY CONNECTED TO SAID GROUND PLANE; AND A DIELECTRIC INSULATOR INTERPOSED BETWEEN SAID SPIRAL ANTENNA AND SAID GROUND PLANE.