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首页> 外文期刊>Applied Computational Electromagnetics Society journal >An Improved Design of Equal-Split Filtering Divider with Integrated Coupled-Line Band-Pass Filter
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An Improved Design of Equal-Split Filtering Divider with Integrated Coupled-Line Band-Pass Filter

机译：集成耦合线带通滤波器的等分滤波分频器的改进设计

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摘要

A novel methodology is proposed for achieving good output port isolation and return loss in a micro-strip filtering divider design with integrated coupled-line (CPL) band-pass filter (BPF). The designed filtering divider shows improved performance parameters as compared to previously reported work. It is proposed that by incorporating an extended transmission line (TL) and a conventional resistor as isolation elements, in addition to good even mode response (i.e., insertion loss IL, and input port return loss RL), the odd mode response (i.e., output port RL and isolation) can simultaneously be improved. In addition, two transmission zeros are realized in the vicinity of the pass band providing a reasonable skirt. Firstly, the coupled-line filter (CPLF) is matched to 70.7 Omega and subsequently integrated in place of conventional quarter wavelength transformers in a Wilkinson Power Divider (WPD) for equal division. Under these matched conditions, it is shown that a TL section and isolation resistor sufficed to achieve a reasonable output port return loss (RL) and isolation in the resulting filtering divider. Experimental validation of the proposed methodology comes from the measurements results of the fabricated CPL filtering divider designed at 3 GHz conforming reasonably to the simulated ones. For instance, 1 dB fractional bandwidth of 15.3%, port isolation of better than 31 dB and good out-of-band performance up to 2.67f(0) were experimentally achieved.
机译：提出了一种新颖的方法，可在带有集成耦合线（CPL）带通滤波器（BPF）的微带滤波分频器设计中实现良好的输出端口隔离和回波损耗。与先前报告的工作相比，设计的滤波分频器显示出改进的性能参数。提出通过结合扩展的传输线（TL）和常规电阻器作为隔离元件，除了良好的偶模式响应（即，插入损耗IL和输入端口回波损耗RL）之外，还可以实现奇模式响应（即，可以同时改善输出端口RL和隔离度）。另外，在通带附近实现了两个传输零，从而提供了合理的裙边。首先，将耦合线滤波器（CPLF）匹配至70.7 Omega，然后在Wilkinson功率分配器（WPD）中将其替换为传统的四分之一波长变换器以进行均分。在这些匹配条件下，显示出一个TL部分和隔离电阻足以在产生的滤波分频器中实现合理的输出端口回波损耗（RL）和隔离。所提出方法的实验验证来自于设计为3 GHz的CPL滤波分频器的测量结果，该分频器与模拟分频器相当。例如，通过实验实现了1 dB的15.3％的小部分带宽，优于31 dB的端口隔离以及高达2.67f（0）的良好带外性能。

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