Erratum for: Compact multiband monopole antenna for UMTS, WiMAX, and WLAN applications

Abstract

time-domain gating is adopted. A same-size metal plate is also measured for calibration.Comparisons of the simulated and measured broadside RCS reductions are shown in Figures 8(a) and 8(b). A good RCS reduction of $20 dB is observed at the resonant frequency, and reasonably close agreements are obtained for both coding cases. The peak RCS reductions in measurements are 3 dB and 1 dB higher than simulations, respectively, which is due to higher magnitude loss of the actual elements. The observed frequency shift of 0.2 GHz is mainly attributed to the deviation of the equivalent circuit parameters of the PIN diode from the manufacturer's datasheet. Other factors, such as soldering, fabrication and measurement accuracy, contribute to the frequency shift as well. When changing the coding, the switching time is also measured by recording the voltage variation [16]. As shown in Figure 9, the time span between two steady states is 12 ls, indicating the fast switching speed of agile scattering fields.