Circular and Radial SIW cavity resonators are proposed to enhance the performance of SIW bandstop filter. Prior to this research work, rectangular cavity resonator was used to produce bandstop response. The design of the circular and radial SIW bandstop filters are done by directly coupling circular and radial cavity resonators to the SIW line. The SIW bandstop filters are designed to operate a...

To restrain the effects of vehicle-guideway dynamic interaction, a bandstop filter is introduced into the maglev levitation controller. To compensate these phase-lags in some particular band produced by the bandstop filter, an allpass filter is designed, which can not only attenuate the amplitude at the resonance frequency, but also decrease the phase-lag in relative-wide band. The simulation r...

This paper presents a tunable bandstop filter design using defected ground structure (DGS) where FR4 substrate is used as a low cost solution compared to others substrate such as Teflon and Rogers RT/Duroid. Thus, the performance of the tunable DGS bandstop filter using FR4 substrate is analyzed in this paper. Besides, analytical modeling of the tunable bandstop filter is derived and discussed ...

Novel approach in the design of 2−D extremely narrow bandstop FIR filters is presented. The completely analytical design method is based on the 1−D optimal bandstop FIR filters. The 1−D FIR optimal bandstop filters are based on Zolotarev polynomial. Closed form formulas for the design of the filters are presented. One example demonstrates the design procedure. One application of the 2−D narrow ...

A generic lumped-element circuit of dual-band bandstop filter (DBBSF) is proposed based on novel composite shunt resonators, and its design method is developed with closed-form formulas. As an example, a DBBSF with center frequencies of 1.7 and 2.3GHz is designed and fabricated using microstrip lines. The measured frequency response agrees excellently with the theoretical predictions, validatin...

This work presents a novel compact dual bandstop filter (DBSF) using planar modified radial stub connected in shunt with 50 Ω microstrip line. The simulation results of the DBSF filter demonstrates good dual wideband bandstop filter (BSF) characteristics with 3 dB stopband fractional bandwidth of 65.42 % and 34.23 % at f1 = 2.4 GHz and f2 = 5.2 GHz resonating frequencies respectively. The inser...

In this paper, a comparative performance of microstrip filters loaded with various dumbbellshaped defected ground structures (DB-DGS) has been studied in terms of their bandstop characteristics. During this course, a new dumbbell shaped DGS having transmetal slit in the connecting slot of the square head in the ground plane has been proposed. This proposed design provides an improved bandstop r...

Tunable reflecting terahertz bandstop filter based on chirped metamaterial structure is demonstrated by numerical simulation. In the metamaterial, the metal bars are concatenated to silicon bars with different lengths. By varying the conductivity of the silicon bars, the reflectivity, central frequency and bandwidth of the metamaterial could be tuned. Light illumination could be introduced to c...

Reconfigurable filter technology is in robustness development. Due on the tunable and reconfigurable capability will contribute a various advantages in wireless applications. This tuning selectivity consist a numerous method, for example using varactor, micromachines, and PINdiodes.This review paper discussed PIN diodes as a switching element. The design and development of different types of sw...