Dual-band suspended stripline filter based on electric metamaterials

Suspended strip-line (SSL) filter is of wide application values for its low insertion loss, high quality factor value, easy integration and compact size. In this letter, we proposed the design of a dual-band SSL band-pass filter based on electric metamaterials, which is realized by introducing a rejection band inside the wide pass-band of a conventional SSL filter. The electric metamaterial can produce negative permittivity and thus hinders the transmission of EM waves along the strip-line. To verify the design method, a prototype, together with a conventional SSL filter for comparison, was designed, fabricated and measured. Both the simulation and experiment results verify the dual-band band-pass filtering property.