Planar Metamaterial with Structured Substrate

Spectral properties of the bi-periodic planar metamaterial in the frequency range 15-40 GHz were numerically investigated.The studied planar metamaterial consists of a long-period photonic crystal formed in a substrate (PCS) and a short-period photonic crystal formed on a microstrip transmission line (PCMSL). The PCMSL unit cell is formed as a series-connected narrow and wide segments of the microstrip transmission line. The PCS unit cell consists of alternating layers with different permittivity (structured substrate).We have shown that narrow transmission regions arise in the transmission spectrum of the planar bi-periodic metamaterial (PBPMM) due to superposition of the stop bands for PCMSL and PCS. The possibility of tuning the position of the transmission peaks due to changes in the permittivity and the length of individual elements of the structured substrate has been demonstrated numerically Such features allow us to create compact narrow-band frequency filters for several frequencies with an additional number of adjustable parameters.