Design and manufacture of lowpass microstrip filter with high conductivity graphene films

The design and manufacture of lowpass microstrip filter with high conductivity graphene films (HCGF) is reported, which is a proven work of the feasibility of HCGF used in microwave devices for wireless communications. The filter is designed as a fifth order Chebyshev step-impedance lowpass microstrip filter operating at 2.5 GHz, its conduct strip is the novel HCGF. Based on the parametric study in the design, the optimum structure parameters of the filter are selected to fabricate the filters using HCGF with conductivity up to 1.1 x 10(6) S/m. It is fabricated with precise and efficient method of laser engraving technique. The test results show that in-band microwave signals can transmit through the proposed HCGF filter effectively with insertion loss of 0.68 dB. The results in this paper show that HCGF filter has good performance comparable characteristics of the traditional copper filters.