Pure harmonic suppression of a bandpass filter using binomially distributed photonic bandgap structures

Binomially distributed photonic band-gap structures (B-PBGSs) are applied to a four-section asymmetric coupled-line bandpass filter (BPF) at 15 GHz. for harmonics suppression. The frequency response of the BPF on B-PBGSs is compared with that for the same BPF on uniform PBGSs (U-PBGSs). The proposed B-PBGSs structures provide complete harmonic suppression in both transmission and return loss (RL) responses. The BPF on B-PBGSs produces 18-dB more harmonics suppression with negligible RL at 15 GHz, compared to the same BPF on U-PBGSs. Promising applications include complete harmonics suppression in filters and patch antennas and savings of space and packaging costs in HMICs and MMICs.