组合式非周期缺陷接地结构的滤波特性研究

提出了一种新型的具有双阻带特性的组合式非周期性缺陷接地结构(CNPDGS),利用时域有限差分法(FDTD)对其滤波特性进行了电磁仿真,研究了其结构尺寸变化对阻带特性的影响,研制了带宽可调节的双阻带滤波器,测量结果与仿真结果一致性很好,此结构的双阻带中心频率位置及它们之间的间隔随着结构参数的变化而变化,两阻带之间的间隔可从3.5GHz到12GHz.这种新型结构可有效地抑制信号中的低端和高端干扰,具有较好的带通滤波特性.

The Study of a Novel Combinatorial Nonperiodic Defected Ground Structure

A novel combinatorial nonperiodic defected ground structure (CNPDGS) with daul stopband is proposed.The microwave circuits with the CNPDGS structure are simulated by finite difference time domain (FDTD) method.The influences of lattice dimensions on the characteristic of frequency are studied.The filters with daul stopband formed by microstrip and proposed CNPDGS are designed and manufactured.The curves of the simulated results and measured results are presented.The measured results are in agreement well with the simulated results.For the filter,the pass band between the two stopbands is tunable.The location and the bandwidth of the pass band are varied with the sizes of lattice dimension.The distance between two stop bands can be changed from 3.5GHz to 12GHz.The filter with the expected pass band can be obtained by the selection of the lattice dimension.The filter with proposed CNPDGS can effectively reject the lower frequencies and higher frequencies in signal.