A Novel Translucent Lowpass Filter Design Using Asymmetric Pi-shaped DGS

In this paper, a translucent low-pass filter for microstrip lines is designed based on an asymmetric Pi-shaped structure. It is fabricated by using flexible material PET and metallic copper with dimensions of 150 mm × 7.8 mm × 0.148 mm. The proposed low-pass filter has a narrow transition band. The insertion loss of the filter less than 1.5 dB below 0.32 GHz and a wide stop band from 1.59 GHz to 6.50 GHz with insertion loss greater than 30 dB. The transparency of the proposed translucent low-pass filter is increased by adding square holes on the copper layer. We cascade multiple identical structures to increase the insertion loss of the stopband without affecting the passband. The proposed translucent low-pass filter is flexibility, high transparency, and high insertion loss in the stopband. These features make it an ideal candidate for use in applications that require electromagnetic protection while maintaining a clear field of view, such as vehicle communication and building house communication. Overall, it provides a new approach to transparent filter design and has the potential to greatly benefit various industries.