Lowpass Filter with Hilbert Curve Ring and Sierpinski Carpet DGS (original) (raw)
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PERFORMANCE OF LOW PASS FILTER USING GROUND DEFECTED STRUCTURE
ijeset.com
The low pass filter is used in many application of microwave communication. Therefore its necessary to design a good low pass filter for the faithful reproduction of wanted signals. Previously methods used to design the low pass filter using insertion loss method don't give a very good flat response. So, a new method has been proposed for the filter design which gives a good response as compared to the conventional designs. A new DGS (Defected Ground Structure) technique to design a low pass filter is proposed here, ground is defected or cut in a desire shape which improves its performance. The size of filter is also reduced.
Design of low-pass filters using some defected ground structures
AEU - International Journal of Electronics and Communications, 2011
We present characteristics of seven types of simple and complex defected ground structures (DGS) slot to realize the quasi-lumped inductance. A simple DGS follows the Butterworth type response; whereas a complex DGS has quasi-elliptic response. The response of DGS has strong influence on the performance of a 5-pole Chebyshev type low-pass filter (LPF). We present a systematic design process to realize the LPF using these DGS slots. The 5-pole open square (OS) DGS based LPF of cutoff frequency 2.5 GHz provides best measured performances-transition region bandwidth 0.53 GHz, 20 dB rejection band-width 14.7 GHz, insertion loss 1.29 dB. Theses performances are better than the reported results of the 5-pole DGS based LPF in literature.
Compact Lowpass Filter with Sharp Transition Band Based on Defected Ground Structures
Progress In Electromagnetics Research Letters, 2009
A lowpass filter with a very sharp transition band using defected ground structures (DGS) is described. The lowpass filter was designed by using three dumbbell slots at the ground plane. Two of those dumbbell slots are the reshaped rectangular and the third dumbbell slot is an inverted triangle. The lowpass filter designed at cutoff frequency of 3.0 GHz, which is suitable for GSM900, GSM1800 and UMTS applications of the mobile communications. The equivalent circuits for the proposed lowpass filter and its corresponding LC parameters are given. The proposed lowpass filter provides a size of 33 × 30 mm 2 , and have good transition band with good performance in the passband and have wide rejection up to 9.25 GHz plus harmonic suppression in the stopband. Measurements results show good agreements with the simulated results.
Novel Design of Compact Low Pass Filter using Defected Ground Structure
2009
This paper presents a novel design method of low pass filter using defected ground structure (DGS) as quasi-lumped element. The design chart is presented for design of quasi-lumped DGS inductors and a systematic design process is presented for design of higher pole DGS based LPF. Accuracy of the method is demonstrated by the design, simulation and testing of two fabricated LPF. Index Terms — Defected Ground Structure (DGS), Microstrip, Low pass Filter (LPF).
Design and Fabrication of a Lowpass Filter Using a New Butterfly-Shaped Defected Ground Structure
Majlesi Journal of Telecommunication Devices, 2021
In this paper, a new Defected Ground Structure (DGS) is introduced and analyzed. The effect of the structure’s dimensions on the location of the attenuation pole and the cutoff frequency to study the frequency characteristics is investigated. In the following, a lowpass filter with 3 dB cutoff frequency at 3 GHz is designed and optimized using the proposed defected ground structure, and its frequency characteristic is reported. The designed lowpass filter is fabricated to verify the simulation process. Also, simulation results, the equivalent circuit, and the measured results with the Network Analyzer are compared.
European Journal of Science and Technology, 2022
A band-pass filter is a wireless component that transmits frequencies within a certain range and attenuates frequencies outside that range. Band-pass filter (BPF) has been used as a core component for an Radio Frequency (RF) communication system. BPF generally designed based on transmission line resonators. Therefore, miniaturization of these components is important. In this study, a triangleshaped band-pass filter with a meander-line resonator and complement split-ring resonator (CSRR) defected ground structure (DGS) and not defected ground structure have been propose in this study. Four different band-pass filter designs have been simulated. In addition to comparing the CSRR DGS effect in different designs, it has been tried to get better results with added perturbation. The materials and thicknesses used in the filters kept constant. BPF fabricated on a standard h of 1 mm thick Rogers RO3003 substrate with dielectric constant ɛr of 3. It aimed to obtain better results by making only geometric changes. Making this geometric changes reliable more than one band-with ranges has been intended. Band-pass filter has been designed for 5 GHz frequency in Wi-Fi which also has been provided considerable results for 3.2 GHz. The numerical results has been compared with the results found in this study. Compared to used sources, more efficient results has been achieved.
A Design of the Low-Pass Filter Using the Novel Microstrip Defected Ground Structure
—A new defected ground structure (DGS) for the microstrip line is proposed in this paper. The proposed DGS unit structure can provide the bandgap characteristic in some frequency bands with only one or more unit lattices. The equivalent circuit for the proposed defected ground unit structure is derived by means of three-dimensional field analysis methods. The equivalent-circuit parameters are extracted by using a simple circuit analysis method. By employing the extracted parameters and circuit analysis theory, the bandgap effect for the provided defected ground unit structure can be explained. By using the derived and extracted equivalent circuit and parameter, the low-pass filters are designed and implemented. The experimental results show excellent agreements with theoretical results and the validity of the modeling method for the proposed defected ground unit structure.
MICROSTRIP LOW PASS FILTER DESIGNS USING DEFECTED GROUND STRUCTURE
The microwave filters play an important role in most RF/microwave applications. They are designed to remove undesired harmonics to reduce the system noise or to remove spurious mixing products. DGS slot with an interdigital shape are introduced here in two elliptic low pass filter designs. Here a fifth order low pass filter was designed, simulated and fabricated for a cut off frequency of 3GHz. Finally a prototype model were designed based on the simulation results obtained. These prototype filter designs have more than 20 dB of stop band rejection and a good return loss in the pass band. The fabricated results proved to be better than the simulation results. In the first low pas filter design the central aperture was replaced with the interdigital slot structure which improved the stop band response at the resonant frequency around 7.8 GHz. To improve the stop band rejection two interdigital structures were introduced in the bottom layer (Ground).
Synthesis of microstrip lowpass filter using defected ground structures
This study reports a systematic synthesis process to design higher-order defected ground structures (DGS)-based lowpass filters (LPF) with Chebyshev and Butterworth responses on any useful substrate in the range 1 r ¼ 2.2 2 12.9, h ¼ 0.6 2 2 mm. The existing circuit models are re-examined and closed-form expressions are presented to compute the area of the DGS slot-heads for the given inductance. The present design method improves the design of the existing DGS-based LPF reported by several investigators -both in terms of the electrical performances and reduction in length up to 57.8%. The improvement in sharpness of the transition is up to 16 dB/GHz. The improvement in the 20 dB rejection bandwidth is up to 4.5 GHz. The group delay response of Butterworth LPF is better than that of Chebyshev LPF. However, length of Chebyshev LPF is small when compared with that of Butterworth LPF. The study also presents the design results of the ultra-wideband DGS-type LPF -at the cut-off frequencies of 5, 7.5 and 12 GHz.