This letter presents a novel miniaturized dual-band bandpass filter (BPF) using a dual-mode dielectric waveguide resonator (DWR). The DWR is a cylinder dielectric block with the surface being silver-coated. The two modes are TM010 and TM011 modes, which are used to construct the two passbands. The frequency of them can be adjusted by changing the radius and the height of the cylinder DWR and the frequency space can be controlled independently. The BPF is composed of three cylindrical cavities, which are arranged in an equilateral triangle. The three cavities construct a cascaded trisection (CT) unit, which creates a transmission zero (TZ) at the upper side of the two passbands. Finally, a dual-band BPF using DWR is simulated, manufactured, and measured to exhibit the feasibility of the proposed design. Their results are in good agreement, showing good performance, such as miniaturization, good return loss (RL), and upper stopband selectivity.

中文翻译：

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使用双模介质波导谐振器的小型化双波段滤波器

这封信介绍了一种使用双模介质波导谐振器 (DWR) 的新型小型化双频带带通滤波器 (BPF)。DWR 是一个表面镀银的圆柱形介质块。这两种模式是TM010和TM011模式，用于构建两个通带。它们的频率可以通过改变圆柱DWR的半径和高度来调节，频率空间可以独立控制。BPF 由三个圆柱形空腔组成，这些空腔排列成等边三角形。三个空腔构成一个级联的三等分 (CT) 单元，在两个通带的上侧创建一个传输零 (TZ)。最后，对使用 DWR 的双频带 BPF 进行了仿真、制造和测量，以展示所提出设计的可行性。他们的结果非常吻合，