In this paper, an efficient microstrip low pass filter (LPF) using arrow-shaped resonators has been proposed. For attenuating undesired harmonics in stop band, stepped-impedance attenuators have been applied. To suppress components in frequency band of 6–10 GHz, two single-base high-impedance stubs have been exploited. To analyze the proposed structure accurately and define the role of each element in the filter, L-C equivalent circuit has been presented. Using this L-C equivalent model, poles and zeros of transfer function can be calculated and discussed. The structure design is based on reducing the coupling effect of elements on each other and neglecting these effects in obtaining the transfer function. Two symmetric arrow-shaped resonators with high-length basis provide 3-dB cut-off frequency as 1.447 GHz. The proposed filter has flat pass band with insertion loss as −0.08 dB and wide stop band with relative stop-band bandwidth (RSB) equal to 1.728. The figure of merit (FOM) is 113,355 which is much interesting compared to other similar works in this field as shown in simulation results.

在本文中，提出了一种使用箭头形谐振器的高效微带低通滤波器（LPF）。为了衰减阻带中不希望的谐波，已应用了步进阻抗衰减器。为了抑制6–10 GHz频带中的分量，已利用了两个单基高阻抗短截线。为了准确地分析所提出的结构并定义滤波器中每个元件的作用，提出了LC等效电路。使用此LC等效模型，可以计算和讨论传递函数的零点和零点。结构设计基于减少元素之间的耦合效应，并在获得传递函数时忽略了这些效应。两个具有高长度基础的对称箭头形谐振器可提供3-dB截止频率，即1.447 GHz。所提出的滤波器具有平坦的通带，插入损耗为-0.08 dB，阻带较宽，相对阻带带宽（RSB）等于1.728。品质因数（FOM）为113,355，与模拟结果中显示的该领域其他类似作品相比，这非常有趣。