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首页> 外文期刊>IEICE Transactions on Electronics >Novel Compact Ultra-wideband Bandpass Filter By Application Of Short-circuited Stubs And Stepped-impedance-resonator
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Novel Compact Ultra-wideband Bandpass Filter By Application Of Short-circuited Stubs And Stepped-impedance-resonator

机译：短截线和步进阻抗谐振器的新型紧凑型超宽带带通滤波器

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摘要

To realize the compact ultra-wideband (UWB) bandpass filters, a novel filter prototype with two short-circuited stubs loaded at both sides of a stepped-impedance resonator (SIR) via the parallel coupled lines is proposed based on a distributed filter synthesis theory. The equivalent circuit of this filter is established, while the corresponding 7-pole Chebyshev-type transfer function is derived for filter synthesis. Then, a distributed-circuit-based technique was presented to synthesize the elements' values of this filter. As an example, a FCC UWB filter with the fractional bandwidth (FWB) @ -lOdBupto 110% was designed using the proposed prototype and then re-modeled by commercial microwave circuit simulator to verify the correctness and accuracy of the synthesis theory. Furthermore, in terms of EM simulator, the filter was further-optimized and experimentally-realized by using microstrip line. Good agreements between the measurement results and theoretical ones validate the effectiveness of our technique. In addition, compared with the conventional SIR-type UWB filter without short-circuited stubs, the new one significantly improves the selectivity and out-of-band characteristics (especially in lower one -45 dB@ 1-2 GHz) to satisfy the FCC's spectrum mask. The designed filter also exhibits very compact size, quite low insertion loss, steep skirts, flat group delay and the easily-fabricatable structure (the coupling gap dimension in this filter is 0.15 mm) as well. Moreover, it should be noted that, in terms of the presented design technique, the proposed filter prototype can be also used to easily realize the UWB filters with other FBW even greater than 110%.
机译：为了实现紧凑型超宽带（UWB）带通滤波器，基于分布式滤波器综合理论，提出了一种新颖的滤波器原型，该滤波器原型通过并联耦合线在步进阻抗谐振器（SIR）的两侧加载了两个短路短截线。建立该滤波器的等效电路，同时导出相应的7极Chebyshev型传递函数以进行滤波器合成。然后，提出了一种基于分布式电路的技术来合成该滤波器的元件值。例如，使用提出的原型设计了分数带宽（FWB）@ -10dBupto 110％的FCC UWB滤波器，然后通过商用微波电路模拟器对其进行了重新建模，以验证合成理论的正确性和准确性。此外，就EM模拟器而言，该滤波器通过使用微带线进行了进一步优化和实验实现。测量结果与理论之间的良好一致性证明了我们技术的有效性。此外，与不带短截线的传统SIR型UWB滤波器相比，新的SIR型滤波器显着提高了选择性和带外特性（尤其是在1-2 GHz的低频段-45 dB @），以满足FCC的要求。频谱模板。设计的滤波器还具有非常紧凑的尺寸，相当低的插入损耗，陡峭的裙边，平坦的群延迟以及易于制造的结构（该滤波器的耦合间隙尺寸为0.15 mm）。此外，应该注意的是，就所提出的设计技术而言，所提出的滤波器原型还可以用于轻松实现具有甚至大于​​110％的其他FBW的UWB滤波器。

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