The 1-, 2-, and 3-dimensional structures obtained from conjugated rings of carbon atoms are reviewed. They include finite small and large molecules (benzenoids, collarenes, beltenes, cyclacenes, cyclophenacenes, Möbius analogs, nanotori) and infinite macromolecules, nets and tilings (graphene, defected graphene, fractal benzenoids, nano-tubes, nano-cones, etc.). A few challenges for future expe...

In this study, a novel compact bandstop filter (BSF) by utilizing the defected ground structure (DGS) and microstrip (DMS) techniques are presented. DGS, DMS, compensated capacitors used on both bottom top layers to obtain sharp transition wider stopband. The operating frequency bandwidth of can be comfortably regulated tuning dimensions etched structures. addition parametric studies, an equiva...

In this article, a novel Compact Circularly Polarized Antenna with notched circular Electromagnetic Band Gap (NCEBG) structure is put forward. This proposed comprises of truncated rectangular patch antenna having its ground plane defected by slots etched on it to achieve compactness and wide impedance bandwidth. structures have the attractive feature in-phase reflection stopband creation for su...