In this article, a dynamically switchable ultra-wideband (UWB) planar monopole antenna employing defected ground structure (DGS) with a folded stepped impedance resonator (SIR) that can operate as either a UWB mode or the single band-notched mode is introduced. The UWB monopole antenna contains a novel whirligig-shaped radiating patch and a chambered conductor as a partial ground plane. The switchable UWB antenna uses one PIN diode as switching elements in the DGS-SIR structure without any biasing network. When the state of diode is OFF, the planar monopole antenna changes to the UWB mode, and when the diode is turned ON, a frequency notch is created at 5–6 GHz. The state of diode is set to the “ON” state dynamically in the presence of a 5–6 GHz RF signal that is detected by using a wireless power management unit (PMU) that contains a broadband rectenna and a DC-DC passive booster. The rectenna consists of a novel cypress-shaped monopole antenna as a signal receiving part and two sub-rectifiers which are connected to a 3 dB branch-line coupler with a grounded isolation port. The antenna switches from UWB to single band-notched when an RF input signal (≥8.5 dBm) in the 5.25 GHz is sensed by the RF PMU with a conversion efficiency of 26% and DC output voltage of 0.36 V, and it fades immediately in real time when the external RF signal is eliminated. In the three-tone signals, the efficiency and input signal improvements are about 10% and −5.5 dBm in the low-power levels, especially, and so develop and enhance the performance of the dynamic reconfigurability.

中文翻译：

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使用宽带整流天线和 DC-DC 升压器的具有动态可切换带陷特性的紧凑型 UWB 天线

本文介绍了一种动态可切换超宽带 (UWB) 平面单极天线，该天线采用缺陷接地结构 (DGS) 和折叠阶梯式阻抗谐振器 (SIR)，可作为 UWB 模式或单带陷波模式运行。UWB 单极天线包含一个新颖的回旋形辐射贴片和一个腔导体作为部分接地平面。可切换 UWB 天线使用一个 PIN 二极管作为 DGS-SIR 结构中的开关元件，无需任何偏置网络。当二极管关闭时，平面单极天线变为 UWB 模式，当二极管开启时，在 5-6 GHz 产生频率陷波。在存在 5–6 GHz RF 信号时，二极管的状态会动态设置为“ON”状态，该信号通过使用包含宽带整流器和 DC-DC 无源升压器的无线电源管理单元 (PMU) 检测到。整流天线由一个作为信号接收部分的新型柏形单极天线和两个连接到具有接地隔离端口的3 dB支线耦合器的子整流器组成。当 RF PMU 以 26% 的转换效率和 0.36 V 的直流输出电压检测到 5.25 GHz 的 RF 输入信号（≥8.5 dBm）时，天线从 UWB 切换到单带陷波，并立即淡入消除外部射频信号时的实时性。在三音信号中，效率和输入信号改善约为 10%，在低功率电平下为 -5.5 dBm，尤其是，