New U-Shaped DGS Bandstop Filters

Abstract

Abstract-In this paper, new microstrip bandstop filters with single band, dual-band and tri-band by using U-shaped defected ground structures are presented without the assistance of coupled lines or certain resonators, and the application of DGS is developed. The proposed bandstop filters have good performances of low loss, multiband operation, transmission zeros which improve the filter frequency selectivity, and miniaturization because of the cascade of DGS and minimum defected patterns which reduce the circuit size. The new designs are demonstrated by measurement.

Compact Triple-Band Bandstop Filters Using Embedded Capacitors

“…Our all three filters are compact against the reported filters, and the control on stopband is relatively easy. The loaded quality factors of our proposed filters are higher than the reported filter in [5][6][7][8][9][10][11][12][13][14]. The fabricated prototype is presented in Fig.…”

“…Multi-band bandstop filters play an important role and are tremendously preferred, which can be simultaneously used for stopping different signal frequencies. Some effective methods have been proposed to develop dual-band [1][2][3][4] and triple-band bandstop filters [5][6][7][8][9][10][11][12]. However, the design of triple-band bandstop filters (TB-BSFs) and controlling the stopband frequencies within the specified band are difficult.…”

“…Hence, relatively less works have been done on TB-BSFs [5][6][7][8][9][10][11][12]. Recently, some TB-BSFs are designed by using series LC resonators and admittance inverters [5], T-shaped defected microstrip structure [6], cross coupling stubs [7], square patch resonator [8], defected microstrip structure (DMS) and E-shaped defected ground structure (DGS) with open-loop resonators coupled to the microstrip line [9], U-shaped DGS [10], Hilbert-Fork resonator [11] and by using meander line stepped impedance resonator [12]. Multi-ring complementary split ring resonators (multi-ring CSRRs) [13], and meandered DMS (MDMS) structure [14] have also been utilized to design the Triple-Band BSFs.…”

Performance Analysis of Low Pass Filter and Band Stop Filter With DGS

“…They gives a lot of different structure for the implementation of DGS [1].Different structures like LPF [2], BSF [3], power divider [4], power amplifier etc was implemented by using it. In addition to PBG (photonic bandgap) and EBG (electromagnetic bandgap) structure, DGS was created by removing the dielectric in different shapes in ground plane.…”

Design and Realization of Three-Pole Bandpass Filter With Spurious Response Suppression Using Defected Ground Structures

“…In the following years, a great lot of novel DGS's were proposed and they had become one of the most interesting areas of research owing to their extensive applicability in microwave circuits [8,9]. Many passive and active microwave and millimeter devices have been developed to suppress the harmonics and realize the compact physical dimensions of circuits for the design flow of circuits with DGS comparatively simple [10][11][12].…”