随着柔性电子、可穿戴设备及植入式医疗电子的快速发展,传统刚性滤波器因难以适应弯曲动态工况,且空间兼容性差,已无法满足新型电子系统需求。为了解决上述问题,提出一种基于柔性电路板的LC滤波器结构。该设计通过引入耦合电容有效缩小了器件尺寸并降低了插入损耗,同时采用双螺旋型电感布局降低了所占面积及损耗 ,显著提升了集成度与弯曲可靠性。在此基础上,两个谐振网络R1和R2通过耦合电容形成了二阶滤波响应,从而构建出具备高空间兼容性与低损耗特性的柔性滤波器。经加工和测试,所提出的柔性滤波器中心频率为11.4 MHz,3 dB分数带宽19.93%,在中心频率处该滤波器的实际插入损耗为1.52 dB,充分验证了其优良的电性能和机械柔性,可满足可穿戴与可折叠应用场景的需求。
Abstract
With the rapid development of flexible electronics, wearable devices, and implantable medical electronics, traditional rigid filters can no longer meet the requirements of new electronic systems due to their inability to adapt to dynamic bending conditions and poor spatial compatibility. To address the above issues, a flexible LC filter is proposed. The proposed structure is implemented on a low-cost flexible printed circuit board (FPCB). The introduction of coupled capacitors significantly reduces the device size and loss; in addition, the design of the double-helical inductor reduces the required area and loss, greatly improves the integrability, and enhances the bending reliability. Furthermore, two resonant networks (R1 and R2) form a second-order filtering response through coupled capacitors, thereby constructing the flexible filter and achieving the goals of high spatial compatibility and low loss. Finally, through fabrication and testing, the proposed flexible filter has a center frequency of 11.4 MHz, a 3 dB fractional bandwidth of 19.93%, and an actual insertion loss of 1.52 dB at the center frequency.
关键词
柔性滤波器 /
低损耗 /
可弯曲 /
小型化
Key words
flexible filter /
low loss /
bendable /
miniaturization
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参考文献
[1] 王成彧,刘云圻,郭云龙.本征柔性/可拉伸有机光电材料与器件的研究进展[J].中国科学(化学),2025,55(6):1444-1470.
[2] 林云飞. 有机硅柔性可拉伸电极及其环境能驱动贴皮可穿戴电子系统集成研究[D].南昌:江西师范大学,2025.
[3] 段雪影. 基于高强度弹性体制备柔性可拉伸传感器的性能与应用研究[D].南宁:广西大学,2024.
[4] Douhi S,Labihi S,Eddiai A,et al.Design,Characterization,and Electromagnetic Performance of a Flexible Wideband RF Antenna Using Composite Materials[J].Journal of Science:Advanced Materials and Devices,2025,10(1):100847.
[5] Xue H,Li W,Zhao C,et al.A Compact Flexible Wideband Wearable Antenna with Improved High-Order Mode Radiation Pattern[J].IET Microwaves,Antennas & Propagation,2025,19:e70066.
[6] Kuo J T,Yeh T H,Yeh C C.Design of Microstrip Bandpass Filters with a Dual-Passband Response[J].IEEE Transactions on Microwave Theory and Techniques,2005,53(4):1331-1337.
[7] Alaydrus M.Designing Microstrip Bandpass Filter at 3.2 GHz[J].International Journal on Electrical Engineering and Informatics,2010,2(2):71-83.
[8] Yeung L K,Wu K L.A Compact Second-Order LTCC Bandpass Filter with Two Finite Transmission Zeros[J].IEEE Transactions on Microwave Theory and Techniques,2003,51(2):337-341.
[9] 冯旭.基于LTCC的高性能带通滤波器的国产化实现[J].机电元件,2025,45(2):7-10+13.
[10] 赵志鳌,赵鹏,刘刚.基于GaAs IPD工艺的紧凑型双N77频段带通滤波器的设计与仿真[J].上海电力大学学报,2025,41(3):295-301.
[11] Wang C,Zaki K.Dielectric Resonators and Filters[J]. IEEE Microwave Magazine,2007,8(5):115-127.
基金
2024年江苏省研究生科研创新项目,项目名称：基于微纳工艺的高性能集成式片上滤波器的研究,项目编号：KYCX24_1159
