Study on high-order frequency selective surface with interdigital capacitance loading  

作　　者：Zheng Guangming Zhou Tianle Lu Haiwei Long Yifei Bai Jing 

机构地区：[1]School of Electronics Engineering of Xi'an University of Posts and Telecommunications,Xi'an 710121,China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2024年第1期57-63,共7页中国邮电高校学报（英文版）

基　　金：This work was financially supported by the 2023 Shaanxi College Students Innovation and Entrepreneur-Ship Training Program Project(S202311664066);supported by the Xi'an Science and Technology Association Youth Talent Lifting Program Project(959202313012).

摘　　要：The application of frequency selection surfaces(FSSs)is limited by large area,narrow bandwidth,low stopband inhibition and large ripple in the passband.A method for designing high-order wide band miniaturized-element frequency selective surface(MEFSS)with capacitance loading is introduced.The proposed structure is composed of multiply sub-wavelength interdigital capacitance layer,sub-wavelength inductive wire grids separated by dielectric substrates.A simple equivalent circuit model,composed of short transmission lines coupled together with shunt inductors and capacitors,is presented for this structure.Using the equivalent circuit model and electromagnetic(EM)model,an analytical synthesis procedure is developed that can be used to synthesize the MEFSS from its desired system-level performance indicators such as the center frequency of operation,bandwidth and stopband inhibition.Using this synthesis procedure,a prototype of the proposed MEFSS with a third-order bandpass response,center frequency of 2.75 GHz,fractional bandwidth of 8%is designed,fabricated,and measured.The measurement results confirm the theoretical predictions and the design procedure of the structure and demonstrate that the proposed MEFSS has a stable frequency response with respect to the angle of incidence of the EM wave in the±30°range incidence,and the in-band return loss is greater than 18 dB,and the rejection in the stopband is greater than 25 dB at the frequency of 3.2 GHz.

关 键 词：frequency selective surface high-order bandpass filter periodic structures interdigital capacitance 

分 类 号：TN713[电子电信—电路与系统]