Transmission line transformer antenna

摘要

The present invention is drawn a transmission line transformer that uses specifically displaced beads of impedance increasing material on the coaxial transmission lines. The beads of impedance increasing material greatly reduce induced back currents on the outer surfaces of the coaxial transmission lines, which reduces losses and improves performance. The specific displacement of the beads enables the coaxial transmission lines to be compactly disposed within a heat sink.

主权项

1. A device comprising:
an input port operable to receive an unbalanced input radio frequency signal; an output port; a transmission line transformer disposed between said input port and said output port, said transmission line transformer comprising n transmission lines, each of said n transmission lines comprising a first end, a second end separated from said first end by a length, an axial conducting core and a coaxial conducting sheathing electrically separated from said axial conducting core, each of said coaxial conducting sheathings being connected to ground at said first end, an axial conducting core at a second end of one of said transmission lines being electrically connected to a second end of a coaxial conducting sheathing of another of said transmission lines, an axial conducting core at said second end of the another of said transmission lines being electrically connected to said output port; a first amount of a first impedance increasing material disposed with said one of said transmission lines to inhibit common-mode current from flowing on an outer surface of said coaxial conducting sheathing of said one of said transmission lines; and a second amount of a second impedance increasing material disposed with said another of said transmission lines to inhibit common-mode current from flowing on an outer surface of said coaxial conducting sheathing of said another of said transmission lines, said second amount of a second impedance increasing material being greater than said first amount of a first impedance increasing material.