Composite antenna of the retarded surface wave type

Claim 1

A DUAL RADIO ANTENNA COMPRISING A PAIR OF ANTENNA PORTIONS EACH CONSISTING OF A BROADSIDE ARRAY OF ENDFIRE ELEMENTS OF THE RETARDED SURFACE WAVE TYPE, SAID ANTENNA PORTIONS BEING OF THE SAME ORDER OF OVERALL WIDTH, BUT ONE OF THEM HAVING A LARGER NUMBER OF ELEMENTS OF SMALLER PHYSICAL DIMENSIONS AT A CLOSER TRANSVERSE SPACING THAN THE OTHER, FOR OPERATION AT A HIGHER RADIO FREQUENCY, AND WITH THE LENGTHS OF THE RESPECTIVE ELEMENTS OF SUCH HIGHER FREQUENCY ANTENNA PORTION BEING TAPERED FROM A MAXIMUM IN THE CENTRAL PORTION OF SUCH ANTENNA PORTION TO MINIMA AT EACH SIDE OF SUCH ANTENNA PORTION, WHILE THE LENGTHS OF THE ELEMENTS OF THE LOWER FREQUENCY ANTENNA PORTION ARE SUBSTANTIALLY UNIFORM, THE TWO SAID ANTENNA PORTIONS BEING MOUNTED IN SUBSTANTIALLY THE SAME PLANE, WITH SUCH HIGHER FREQUENCY ANTENNA PORTION BEING MOUNTED ADJACENT TO AND IN FRONT OF SUCH LOWER FREQUENCY ANTENNA PORTION, WITH BOTH THE FORWARD ENDS OF THE ELEMENTS OF SAID LOWER FREQUENCY ANTENNA PORTION AND THE REARWARD ENDS OF THE ELEMENTS OF SAID HIGHER FREQUENCY ANTENNA PORTION BEING RESPECTIVELY IN APPROXIMATE TRANSVERSE ALIGNMENT.