B6. Multiband sharp-skirt compact gap resonator based D-CRLH

In this paper, a novel design of multi band (dual/quad) coupled gap transmission line resonators based on dual composite right/left handed microstrip structure is developed. The introduced structures demonstrate dual and quad resonances high selective sharpness passband response. The consummate structures was designed using one and two cells consist of a combination of a shunt tank related to interdigital capacitor and strip inductor, in addition to series tank intended using patch capacitor with small strip inductor. Furthermore, the paper elaborates the equivalent circuit model, analytical study, 3D full wave simulation and fabrication measurement results. The results manifest four sharp pass band resonances at 4 GHz, 5.8 GHz, 6.6 GHz, and 7.7 GHz with transmission coefficients equal -0.69 dB, -1.9 dB, -3.9 dB, and -3.7 dB, respectively. The quality factor demonstrates very high selectivity and equals 75.75, 151.75, 125, and 82.7 at the four bands, respectively.