Optimized Wideband Impedance Matching Balun for Conducting Two-Arm Antennas

Figure 19

The return losses against the frequency obtained when feeding a strip dipole antenna with (i) a conventional split coaxial balun as designed in [11], (ii) a split balun with a step transition of the inner conductor as optimized in the present work, and (iii) a coaxial line (no balun is used).