This work describes a new strategy for improving the peak power handling capability (PPHC) of microstrip bandpass filters (BPFs) without any degradation in the electrical performance. For this purpose, a new resonator topology with rounded open-circuit terminations is proposed. Using this strategy, sharp edges are avoided, and a reduction of the maximum peak voltage ( $V_{\mathrm{peak}}$ ) is obtained, leading to higher peak power thresholds. An in-depth analysis of the variation of $V_{\mathrm{peak}}$ and PPHC as a function of the circle radius is also carried out. As a validation, two microstrip BPFs centered at 1.6 GHz with different end-circle sizes are designed, manufactured, and measured, showing a PPHC enhancement of 2.10 and 1.15 dB, respectively, compared to a standard microstrip BPF.

中文翻译：

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使用圆形端谐振器提高微带带通滤波器的峰值功率处理

这项工作描述了一种新的策略，可以提高微带通滤波器（BPF）的峰值功率处理能力（PPHC），而不会降低电气性能。为此，提出了一种具有圆形开路端接的新型谐振器拓扑。使用此策略，可以避免出现尖锐的边缘，并降低最大峰值电压（ $ V _ {\ mathrm {peak}} $ ），导致更高的峰值功率阈值。深入分析 $ V _ {\ mathrm {peak}} $ PPHC也是圆半径的函数。作为验证，设计，制造和测量了两个以1.6 GHz为中心，端圆大小不同的微带BPF，与标准微带BPF相比，PPHC分别提高了2.10 dB和1.15 dB。