Experimental design of bandstop filters based on unconventional defected ground structures (original) (raw)
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Design and Analysis of Microstrip Bandstop Filter Based on Defected Ground Structure
This Paper presents a planar Microstrip Bandstop filter with the use of defected ground structure. The bandstop filter has been designed with the use of step impedance microstrip line on the top of substrate and two convention rectangular defects in a ground plane (Using DGS technique). It produces stopband from the frequency range of 3.3GHZ to 4.8GHZ with the stop band attenuation more than 30dB. It provides relative 3dB bandwidth response of 1.5GHZ.The tuning of frequency has been carried out with the change in dimension of defected ground plane. A simulation has been performed on ANASOFT High frequency structure simulator (HFSS) and an equivalent LC circuit of the design has been verified with ANASOFT designer 8.0 Software
IJERT-Design and Analysis of Microstrip Bandstop Filter based on Defected Ground Structure
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/design-and-analysis-of-microstrip-bandstop-filter-based-on-defected-ground-structure https://www.ijert.org/research/design-and-analysis-of-microstrip-bandstop-filter-based-on-defected-ground-structure-IJERTV3IS050044.pdf This Paper presents a planar Microstrip Bandstop filter with the use of defected ground structure. The bandstop filter has been designed with the use of step impedance microstrip line on the top of substrate and two convention rectangular defects in a ground plane (Using DGS technique). It produces stopband from the frequency range of 3.3GHZ to 4.8GHZ with the stop band attenuation more than 30dB. It provides relative 3dB bandwidth response of 1.5GHZ.The tuning of frequency has been carried out with the change in dimension of defected ground plane. A simulation has been performed on ANASOFT High frequency structure simulator (HFSS) and an equivalent LC circuit of the design has been verified with ANASOFT designer 8.0 Software
Procedia Technology, 2014
Until recently, microstrip filter designs were being done with full metallic ground-plane present on one side of the substrate. The state-of-the-art, however, changed when deliberately created defects in the ground (called Defected Ground Structures or, simply, DGS) were introduced, to further improve the filter performance. This paper presents four original design examples on low-pass and band-pass filters with and without DGS. Design methodology, optimization details, fabrication details, and experimentally-obtained data are presented, for each of the designs. The prototypes are tested using Rohde and Schwarz ZVA40 Vector Network Analyzer. It is found that the filter performance characteristics like passband ripple, 3-db bandwidth, return loss and stopband rejection show significant improvement when Defected Ground Structures are used in the design.
Design and realization of microstrip filters with new defected ground structure (DGS)
Engineering Science and Technology, an International Journal, 2017
In this paper, various microstrip filters, such as bandpass (narrow/wideband) filters, dual band bandpass filter and lowpass filters, are designed with new metal strips loaded defected ground structure (DGS). In this proposed DGS, metal strips are introduced in connecting slot of dumbbell shaped DGS (DB-DGS). This new DGS is an improved version of conventional (dumbbell-shaped) DGS with enhanced characteristics of filters. With this new metal strip loaded DB-DGS, a bandpass (narrow-band/wide-band) filters, dualband bandpass filter and lowpass filters, are designed with improved characteristics. The entire proposed filters are designed and fabricated with the same substrate area using 50 O, k g /4 microstrip line which is very compact to conventional microstrip filters. For validation of proposed designs, all fabricated filters are measured in Rohde and Schwarz Vector Network Analyzer 1127.8500 and also compared with circuit simulated results. All the simulations are carried out in HFSS V10 and ADS2006A.
setit.rnu.tn
In this paper, we proposed a new compact DGS band-stop filter with broad passband and low insertion loss in the stop-band. The philosophy of the structure behind this new microstrip band-stop filter is simple as it is composed of a pair of octagonal DGS-slots and an open-stub as compensated microstrip capacitance. The filter will be realized through direct electromagnetic coupling and slow wave effect methods. With this configuration, the BSF with higher compactness, broad passband and sharp transition characteristics was realized. The design formulas are derived by using an equivalent-circuit model of a parallel L-C resonator. In order to validate the feasibility of the proposed design method, a band-stop filter with 0.9-dB ripple is designed, fabricated, and measured. The Experimental results agree well with the simulation results.
Abstract ─ This paper presents a novel compact microstrip band-stop filter (BSF) based on octagonal defected ground structure (DGS) along with interdigital and compensated capacitors. The proposed BSF has lower and higher cut-off frequencies of 3.4 GHz and 5.3 GHz, respectively. A comparison between simulation and measurement results confirms the validity of the BSF configuration and the design procedure. The compact filter occupies an area of (0.45g × 0.35g) with g = 0.044 m on an r = 3.66 substrate and shows a 44% bandwidth ( 2GHz) and a return loss of 0.1 dB. The experimental results show the excellent agreement with theoretical simulation results.
Novel Dual Band-Reject Microwave Filter Using C-Shaped Defected Ground Structures
International Journal of Computer and Electrical Engineering, 2012
In this paper, a new compact dual band-reject C-shaped defected ground structure (DGS) for microstrip line is introduced. Using two units of the same shaped DGS with different dimensions, a dual band-stop filter is designed and implemented. Results show that there are two parallel resonance frequencies at 2.468 GHz and 6.629 GHz with a very high Q-factor. The frequency characteristics of the proposed filter could be controlled by adjusting the DGS parameters such as width and length of both C-shaped patterns. Also, the distance between the two DGS structure could be adjusted for the required frequency characteristics. The proposed DGS provides Q-factor of more than 50 with attenuation of at least 20 dB at the resonant frequencies. The new introduced DGS filter is successfully designed and fabricated and the measured results are in a very good agreement with those obtained by numerical investigation.