The balun accomplishes this by its balanced feed and choking action at the low-impedance point (and hence high-current point ... The most popular form of the 1:1 balun has probably been the Ruthroff ...

ADT2-1T-1P is another for higher frequency. For higher frequency consider the TC1-1-13MA+ as in () - note it is a 1:1 balun, so see note about impedance matching on liinked webpage. As per datasheet ...

Abstract: The compensated balun, first described by Marchand and later reinvented by Roberts, is found to have much broader band-widths than realized by either author. This balun is analyzed here and ...

This transformer pinout is actually as in Coilcraft datasheet: Therefore the differential lines should have been connected to pins #2 and #3 of the transformer while the single-ended output should ...