With increasing radio spectrum being allocated to wireless communications, multiband and ultrawideband systems are becoming much more prevalent. Such broadband systems are susceptible to interference, or can inadvertently radiate out-of-band emissions, so significant filtering is required at RF front-ends. With this motivation, a broadband conical monopole antenna with integrated tunable notch cavity filters is presented. The antenna is a complex structure but it can be conveniently realized with lightweight perforated alloy surfaces using 3-D printing. This coax-fed antenna is demonstrated to maintain its omnidirectional azimuthal pattern with a very wide notch-tuning range, resulting in a versatile broadband antenna.

中文翻译：

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带有集成可调谐陷波滤波器的锥形单极天线

随着越来越多的无线电频谱分配给无线通信，多频带和超宽带系统变得越来越普遍。这种宽带系统容易受到干扰，或者可能会无意中辐射出带外辐射，因此需要在 RF 前端进行大量滤波。出于这个动机，提出了一种带有集成可调谐陷波腔滤波器的宽带锥形单极天线。天线是一种复杂的结构，但它可以通过使用 3D 打印的轻质穿孔合金表面方便地实现。这种同轴馈电天线被证明可以保持其全向方位角图和非常宽的陷波调谐范围，从而形成多功能宽带天线。