In this article, a novel left-handed (LH) waveguide transmission line with good filtering performance is proposed and implemented below the TM mode cutoff frequency. TM₁₁ mode is employed and transmitted inside the waveguide. The LH passband is achieved by TM mode cutoff operation and complementary split-ring resonator (CSRR) loading, which are able to provide negative μ and ε, respectively. It constitutes the main novelty here with the rectangular waveguide TM mode and CSRR to realize the LH characteristics, which has not been done before. Based on this passband, two bandpass filters with high-selectivity are designed and fabricated. The measured results are in agreement with the simulated data. It shows a good LH passband below the cut-off frequency and TM₁₁ mode propagation is also detected at higher frequency above the cutoff.

中文翻译：

---

基于波导TM模式的左手传输线的实现

在本文中，提出并在 TM 模式截止频率以下实现了一种具有良好滤波性能的新型左手 (LH) 波导传输线。采用 TM ₁₁模式并在波导内部传输。LH 通带是通过 TM 模式截止操作和互补裂环谐振器 (CSRR) 负载实现的，它们能够分别提供负 μ 和 ε。矩形波导 TM 模式和 CSRR 构成了这里的主要新颖性，以实现 LH 特性，这是以前从未做过的。基于该通带，设计并制作了两个高选择性带通滤波器。测量结果与模拟数据一致。它在截止频率和 TM ₁₁以下显示出良好的 LH 通带 在高于截止频率的更高频率处也检测到模式传播。