Literature Survey on PBG Assisted Microwave Devices

A comprehensive literature survey on recent development of PBG structures and their applications to microwave devices including antennas has been reported in this chapter. PBG structures are found to play vital roles in enhancing the performance of the microwave components and devices.
The stopband characteristic causes the dramatic improvement in the performance by suppressing surface waves, leakage and spurious transmission. FF is one of the important controlling factors to yield wider and distinct stopband that should be optimized to maintain a smoother transmission in the passband. In the literature for uniform circular patterned PBGSs, the optimized FF of 0.25 [21] is considered.  This type of design is considered as a conventional PBG  structure design.  After carrying out the survey of beneficial effects of PBGSs, the reconfigurable phased array antennas reported in literature are presented. Finally a short briefing on motivation, reasoning and proposed proposition of PBGSs has been outlined.