In this letter, a novel concept for the dielectric resonator functioning as a differential antenna and as an independently controllable dual-band filter simultaneously is proposed for the first time. The multifunctional design takes full advantage of the virtual and reflection grounds of the differential dielectric resonator antenna (DDRA). The antenna and filter functions share a single module and a physical ground, making the proposed design compact and cost effective. In addition to high isolation between the two functions, the filter part shows two independently adjustable passbands. For demonstration, a prototype is designed, fabricated, and measured. The DDRA is designed at 2.5 GHz with an impedance bandwidth of 2.7% and the realized gain of 4.5 dBi. The dual-band filter operates at the center frequencies of 2.16 GHz and 3.51 GHz with 3 dB bandwidths of 13% and 7%, respectively. A good agreement is observed between the simulated and measured results.

中文翻译：

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差分介电谐振天线用于独立可控双频带滤波器的使用

在这封信中，首次提出了同时用作差分天线和可独立控制的双频带滤波器的介电共振器的新概念。多功能设计充分利用了差分电介质谐振器天线（DDRA）的虚拟接地和反射接地的优势。天线和滤波器功能共享一个模块和一个物理接地，从而使建议的设计紧凑且具有成本效益。除了两个功能之间的高度隔离之外，滤波器部分还显示了两个独立可调的通带。为了演示，设计，制造和测量了原型。DDRA设计为2.5 GHz，阻抗带宽为2.7％，实现的增益为4.5 dBi。双频带滤波器以2.16 GHz和3的中心频率工作。51 GHz，3 dB带宽分别为13％和7％。在模拟结果和测量结果之间观察到很好的一致性。