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Recent content by no1cobra

  1. N

    Hardware design for microstrip parallel coupled BPF

    1.8GHz最好不要用FR4的基板，FR4的基板介电常数变化范围大，不稳定，而且损耗大。建议你用聚四氟乙烯的基板 Added after 27 minutes: 1、你的原理图（schematic）有问题，损耗角正切不能为理想值，电导率不能为无穷大 2、对于这种类型的微带平行耦合滤波器（microstrip parallel coupled bpf ）一般用奇数阶，而不用偶数阶，因为偶数阶不稳定。 3、你的滤波器相对带宽（FBW）太小，仅是1.4%，这样的滤波器做出来后插入损耗（insert loss）会很大。而且，相对带宽太小的话，加工精度对它影响很大。...
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