Key Laboratory for Organic Electronics and Information Displays;
Nanjing University of Posts and Telecommunications;
Nanjing 210023;
China;
Institute of Advanced Materials(IAM);
Nanjing University of Posts and Telecommunications;
Nanjing 210023;
China;
National Laboratory of Solid State Microstructures;
Nanjing University;
Nanjing 210093;
China;
Shaanxi Institute of Flexible Electronics;
Northwestern Polytechnical University;
Xi’an 710072;
China;
bandpass filter; split ring resonator; substrate integrated waveguide; transmission zeros;