Fig. 1. Photograph of the HP-UWB combined antenna

Fig. 2. Sketch of the TEM horn part of the HP-UWB combined antenna

Fig. 3. Sketch of the tapered-slot balun

Fig. 4. Comparison of VSWR of HP-UWB combined antennas with different baluns

Fig. 5. Electric field distribution of different baluns with upper plate of TEM horn

Fig. 6. Comparison of VSWR of HP-UWB combined antennas with different area of magnetic dipole

Fig. 7. Sketch of the impedance transformer

Fig. 8. VSWR of the impedance transformer

Fig. 9. Experimental platform for VSWR testing

Fig. 10. Measured and simulation results of VSWR of HP-UWB combined antenna

Fig. 11. Waveform of the high-power bipolar pulse for experiment

Fig. 12. Normalized spectrum of the high-power bipolar pulse for experiment

Fig. 13. Waveform of radiation field of the antenna at 10 m

Fig. 14. Normalized spectrum of radiation field of the antenna at 10 m