Motivation, Reasoning and the Proposed Proposition of EBG structures and Application of Dumbbell shaped EBGS as BPF

Motivation, Reasoning and the Proposed Proposition of EBG structures

From the intensive literature survey it is clear that the inclusion of EBGSs / dumbbell shaped EBGSs improve the performance of microwave components and devices significantly. From the performance of novel 2-D EBG structures for microstrip lines it is obvious that the performance is hindered by the optimized value of FF.
Even it can be seen from [3], the passband performance is very poor with the optimized FF. The performance with UC-EBGS is reported in [4].  So there exists a wider scope of research to find a newer model of EBG structures that will yield a very wider and distinct stopband as well as a better passband with minimum ripple heights. The performance of the newer EBGSs for microstrip lines will be observed first and will be compared with the available performances in the literature. Newer dumbbell shaped EBGSs are proposed to replace the conventional one. So the opportunities is being sought to use EBGS/dumbbell shaped EBGS that yields better performances in terms return loss bandwidth, smoother transmission with minimum insertion loss, wider and distinct stopband performance. EBGS in the form EBGSs or dumbbell shaped EBGSs are useful in many microwave devices and components. The conventional EBGSs / dumbbell shaped EBGSs performances need to be improved. In such situation there are lots of research opportunities. This is the main motivation of the present research. The reasons of the present research work are to improve the performance coNon-uniform EBGSnventional EBGSs/dumbbell shaped EBGSs to be used in microwave devices and components. Both EBGSs and dumbbell shaped EBGSs may be used in 1-D form to realize phased array antenna. This type of EBGS/dumbbell shaped EBGS assisted phased array antenna is a novel idea in microwave community. The prime interests of the research may be mentioned as following :Realization of Band Pass Filter (BPF) and Non-uniform EBGS 






Application of Dumbbell shaped EBGS as BPF

Conventional PBGSs or PBGSs with non-uniform distribution generate stopband at a particular frequency. Second harmonic suppression may be attained significantly with the non-uniform PBGSs as they provide better performance than conventional ones. Uniform circular PBGS and non-uniform circular PBGS with Binomial distribution will be investigated to see their capabilities of harmonic suppression. To suppress the third harmonic along with second harmonic, the stopband should be enormously large so that they can cover both the harmonics. As PBGSs follow Bragg’s condition to define the approximate center of the stopband frequency so they cannot generate enormous stopband suitable for third harmonic suppression.In this circumstance DGSs may be considered to be a vital candidate for both the second and third harmonic suppression.