In this paper, CPW-Fed ultra wideband (UWB) planar monopole antenna loaded by double inclined elliptical split ring resonators (ESRRs) for double band-notch characteristics is introduced, examined, and fabricated. Two different ESRRs with different dimensions are printed in the antenna backside to notch two different frequencies in the UWB frequency range instead of using two ESRR pairs as usual. The ESRRs are then rotated and the corresponding return loss is studied. Different notch frequencies can be obtained by varying the ESRRs’ dimensions. Finite element method FEM and finite integration technique FIT are used to simulate the proposed structures through the usage of Ansys HFSS and CST MWS. Good agreement between both results has been obtained. Two different prototypes of the proposed antenna are fabricated and their reflection characteristics are measured. The first antenna is the UWB antenna with two straight ESRRs in which two notch frequencies at 5.3 GHz and 6.8 GHz have been obtained. The second antenna is the UWB antenna with two inclined ESRRs in which two notch frequencies at 5.1 GHz and 6.9 GHz have been obtained. In both cases, good agreement between simulated and measured results has been obtained and the discrepancies are due to fabrication and alignment errors. Also in both cases the proposed antennas notch WLAN and C-band wireless coexisted applications. A directive radiation pattern in E-plane and omnidirectional radiation patterns in the H-plane could be observed. Also the gain is suppressed in the notch frequencies in both cases. The group delay is nearly stable in the UWB frequency range, except at the notch frequencies, which is distorted sharply. So, the proposed antenna is a good candidate for the modern UWB systems.

本文介绍，研究和制造了由双倾斜椭圆开口环谐振器（ESRR）加载的CPW馈电超宽带（UWB）平面单极天线，该天线具有双带陷波特性。在天线背面印有尺寸不同的两个不同的ESRR，以便在UWB频率范围内刻出两个不同的频率，而不是像往常一样使用两个ESRR对。然后旋转ESRR，并研究相应的回波损耗。可以通过改变ESRR的尺寸来获得不同的陷波频率。通过使用Ansys HFSS和CST MWS，使用有限元方法FEM和有限积分技术FIT对拟议的结构进行了仿真。两种结果之间已经取得了良好的一致性。制造了所提出天线的两个不同的原型，并测量了它们的反射特性。第一个天线是具有两个直线ESRR的UWB天线，其中已获得5.3 GHz和6.8 GHz的两个陷波频率。第二个天线是具有两个倾斜ESRR的UWB天线，其中已获得5.1 GHz和6.9 GHz的两个陷波频率。在这两种情况下，已经获得了模拟结果和测量结果之间的良好一致性，差异是由于制造和对准误差引起的。同样在两种情况下，建议的天线都在WLAN和C频段无线应用中使用。可以观察到E平面上的定向辐射图和H平面上的全向辐射图。在两种情况下，陷波频率的增益也受到抑制。除了在陷波频率处，群延迟在UWB频率范围内几乎是稳定的，陷波频率会急剧失真。因此，建议的天线是现代UWB系统的理想选择。