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为解决传统的微带低通滤波器的宽阻带、窄过渡带和小型化性能不能兼顾的矛盾,本文设计出一种基于Hilbert分形DGS的微带低通滤波器。Hilbert分形DGS单元和半圆型并联枝节谐振单元级联构成该低通滤波器,Hilbert分形DGS单元可减小结构尺寸和通带内的反射损耗,并联谐振单元可有效抑制高次谐波分量。此外,针对DGS单元对微带线特性阻抗的影响,采用渐变微带线进行阻抗补偿,使滤波器的通带与阻带性能获得明显改善。测试结果显示滤波器通带范围为0~5.2GHz时,通带插入损耗0.3dB,阻带范围5.8~20.0GHz以上,面积为23.6mm×9.5mm。
In order to solve the conflict between wideband stopband, narrow transitionband and miniaturization performance of traditional microstrip lowpass filters, a microstrip lowpass filter based on Hilbert fractal DGS is designed. The Hilbert fractal DGS unit and the semi-circular shunt parallel resonator unit form the low-pass filter. The Hilbert fractal DGS unit can reduce the size of the structure and the reflection loss in the passband. The parallel resonant unit can effectively suppress the higher harmonic components. In addition, aiming at the influence of DGS unit on the characteristic impedance of microstrip line, a gradual microstrip line is used to compensate the impedance, so that the passband and stopband performance of the filter are obviously improved. The test results show that the passband insertion loss is 0.3dB and the stopband range is 5.8 ~ 20.0GHz with an area of 23.6mm × 9.5mm when the passband of the filter is 0~5.2GHz.