A polyimide (PI)-based flexible bandpass filter is fabricated by self-metallization technology, which covers Wireless Local Area Network (WLAN) of 5.15—5.875 GHz. The measured characteristics indicate the flexible filter under flat state has the return loss of better than 20 dB, the minimum insertion loss of 0.83 dB, a 3 dB bandwidth of 0.725 GHz, and the central frequency of 5.5 GHz. At the same time, the designed filter is measured in different bending and folding conditions. Simulated and measured results are similar whether the filter is under flatting, bending, or folding conditions. Fatigue test and timeliness test are studied to confirm that the filter has stable chemical and mechanical properties. The formed silver layers fabricated by self-metallization technology have good mechanical and electrical flexibility. The designed flexible filter is promised for integration within future flexible electronics.

采用自金属化技术制造了一种基于聚酰亚胺 (PI) 的柔性带通滤波器，覆盖了 5.15-5.875 GHz 的无线局域网 (WLAN)。实测特性表明，该柔性滤波器在平坦状态下的回波损耗优于20 dB，最小插入损耗为0.83 dB，3 dB带宽为0.725 GHz，中心频率为5.5 GHz。同时，设计的滤波器在不同的弯曲和折叠条件下进行测量。无论过滤器处于展平、弯曲还是折叠条件下，模拟和测量结果都相似。研究了疲劳试验和时效性试验，以确认过滤器具有稳定的化学和机械性能。通过自金属化技术制造的形成的银层具有良好的机械和电柔韧性。