Heart shaped reconfigurable band notched UWB microstrip line fed monopole antenna using two mushrooms like electromagnetic band gaps (EBGs) loaded by two varactor diodes has been developed, examined and fabricated. The effect of EBG dimensions, on the notch frequency, was first examined. A notched frequency of 5.3 GHz is obtained when two square EBGs with rectangular slits are used with length equal 7.5 mm and gap, g = 0.5 mm. The EBGs is loaded by a varactor diode to achieve re-configurability. The notch frequency covers WiMAX when varactor capacitance C = 0.7 pF and covers WLAN when C = 0.1pF. Also, the notch can be easily eliminated by decreasing the capacitance below 0.1 pF. A prototype of the proposed antenna using single capacitor elements with capacitances 0.6 pF is fabricated and S₁₁ is measured. Notch frequency at 4 GHz is obtained in both simulated and measured antenna structures. The antenna with EBG has a directive radiation pattern in E-plane and omnidirectional pattern in H-plane. Also, the gain is suppressed in the notched frequencies. The group delay is nearly stable in the UWB frequency range, except at the notch frequencies, which is distorted sharply. FEM and FIT are hired to simulate the proposed antenna structure using HFSS and CST respectively. Very good agreement between both results has been obtained.

已开发，检查和制造了使用两个蘑菇状的可重构带隙UWB微带线馈电单极天线，这两个蘑菇像是由两个变容二极管加载的电磁带隙（EBG）。首先检查了EBG尺寸对陷波频率的影响。当使用两个带有矩形狭缝的方形EBG（长度等于7.5 mm，间隙g = 0.5 mm）时，可获得5.3 GHz的陷波频率。EBG由变容二极管加载以实现可重新配置。当变容电容C = 0.7 pF时，陷波频率覆盖WiMAX，当C = 0.1pF时，陷波频率覆盖WLAN。此外，通过将电容减小到0.1 pF以下，可以轻松消除缺口。使用电容为0.6 pF的单个电容器元件制造了拟议天线的原型，并制作了S ₁₁被测量。在仿真和测量的天线结构中均可获得4 GHz的陷波频率。带有EBG的天线在E平面上具有定向辐射方向图，在H平面上具有全向方向图。而且，在陷波频率中增益被抑制。除了在陷波频率处，群延迟在UWB频率范围内几乎是稳定的，陷波频率会严重失真。分别使用FEM和FIT分别使用HFSS和CST模拟拟议的天线结构。这两个结果之间已经获得了很好的一致性。