New class of microstrip miniaturised filterusing triangular stub

Design of Compact Low-pass Filter with With Wide Rejection Band Using Cascaded Arrowhead-DGS and Multilayer-Technique

“…1 is taken in the ground plane of a microstrip line on substrate ε r = 3.38 having thickness h = 0.813 mm. The arrowhead DGS has sharper cutoff and better rejection in the stop-band [2][3][4]. Its LC equivalent circuit is shown in Fig.2.…”

Design of microstrip bandpass and lowpass filters using coupling matrix method and a new hairpin defected ground structure

“…The structure of the proposed BPF is shown in Figure 3, in which two DGSs are etched in the ground plane below a microstrip line with series gap. To control the resonance frequency while keeping the size of the DGS constant, we varied the length of the internal DGS arm [3]. As shown in Figure 4, as d increases, the center frequency decreases while maintaining the compact size of the filter.…”

New Low-Pass Filter Design Using Compensated Microstrip Capacitor and Coupled Meander Defected Ground Structure (DGS)

“…Conventional low-pass filters, such as open-stub filters and stepped impedance filters [1], can not meet the requirements for modern communication systems because of some drawbacks [3]. In literature, many design approaches have been proposed to improve the low-pass filter performance.…”

“…In literature, many design approaches have been proposed to improve the low-pass filter performance. To tackle this problem, some filters using electromagnetic bandgap (EBG), stepped impedance, and asymmetric structure have been proposed [1][2][3]. To further reduce the filter-circuitry size, a new group of microstrip lowpass filters utilizing the slow-wave effect were recently developed.…”