Design and Analysis of Spurious Harmonics Suppressed Microstrip Ultrawide Band Filter using Modified Defected Ground Structure Techniques

Design of double-notch UWB filter with upper stopband characteristics based on ACPW-DGS

“…As can be seen from the second column of Table 6 , the filter in this paper is different from others in structure, it adopts the improved ACPW-DGS. It can be seen from the third column that the structure proposed has transmission zeros in both the upper and lower passbands unlike the [ 5 , 37 , 42 , 44 ], which has only one transmission zero, whereas [ 38 , 41 , 43 ] do not possess transmission zero. Columns 4, 5, and 6 describe that the structure in this design has a relative bandwidth of 3dB of 110%, the return loss is greater than 12.15dB, and there are two notches at 9.28GHz and 10.48GHz, all of which are greater than 20dB.…”

“…Compared with other filter designs, the filter has the following advantages in physical processing: no complicated processing technology is required, no drilling is required, and the dimensional accuracy of the board design is after one decimal point. The UWB filter designed in this manuscript is compared with the [3,5,[33][34][35][36][37][38][39][40][41][42][43][44], and the results are shown in Table 6. As can be seen from the second column of Table 6, the filter in this paper is different from others in structure, it adopts the improved ACPW-DGS.…”