The probe inductance is reduced by increasing its diameter to 0.2 cm (BNC/TNC connector), which shifts the kink toward
the center of the Smith chart as shown in Figure 8.13, thereby improving the VSWR at the kink.
The increase in the probe diameter increases the resonance frequency slightly because of a decrease in the probe inductance, which decreases the total inductance of the antenna. For the thicker probe, the BW for VSWR £ 2 is 220 MHz (7.4%) and the BW for AR £ 3 dB is 49 MHz (1.7%). The measured results are in agreement with these theoretical
results [6, 7].