CPW bandstop filter using periodically loaded slot resonators

A CPW bandstop filter using double hairpin-shaped defected ground structures with a high Q factor

“…This structure also provides a Q factor of 49.7 with a 219.3 dB suppression level, demonstrating acceptable insertion loss at less than 21 dB in the passband, as shown in Figure 2. These DGSs can be modelled as parallel RLC resonance circuits in common with other DGSs [6,10]. The equivalent RLC circuit model is shown in Figure 3(a), with parameters R eq 5 822.6 X, L eq 5 60.4 pH, C eq 5 19.2 pF.…”

“…where Z O is the characteristic impedance of the transmission line, 50 X, f O is the resonant frequency, and Df is the 210 dB bandwidth. The proposed hairpin-shaped DGSs are isolated from the gap between the signal line and grounds of the CPW, and as such differ from conventional hairpin-shaped DGSs [4,10]. By locating the hairpin-shaped DGS apart from the separation of the CPW, two return current paths are formed on the ground of the CPW as shown in Figure 3(b).…”

High port‐to‐port isolation dual circularly polarised microstrip patch antenna with multifunction DGS

“…To the best of the authors' knowledge, applying DGS for the dual role of port‐decoupling and AR bandwidth enhancement in a DCP antenna is still a relatively unexplored area. The DGS employed in this antenna is made up of complementary spiral resonators which are preferred for their compactness and less unwanted interference among adjacent DGS units [20, 21].…”

Application of MRTD on Novel Ultra-Wideband Bandpass Filter

“…In 1996, MRTD method was used to solve Maxwell equation by Krumpholz. The mesh space of MRTD method is similar with the traditional format of Yee-FDTD, not only good dispersion characteristics but also the calculation memory and computing speed is obtained. The mesh numbers needed by MRTD algorithm are less than that needed by traditional FDTD algorithm [5][6][7]. The numerical dispersion of the MRTD algorithm is smaller than that of the ordinary FDTD method compared with the traditional FDTD method.…”