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Journal articles on the topic 'Low Pass Filter (LPF)'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Li, Bao Ping, and Yan Liang Zhang. "Novel Low-Pass Microwave Filter Based on Rectangular Ring DGS." Applied Mechanics and Materials 273 (January 2013): 371–74. http://dx.doi.org/10.4028/www.scientific.net/amm.273.371.

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Due to the frequency response periodicity of distributed transmission line, microstrip band-pass filter usually produces parasitic pass-band and outputs harmonics away from the center frequency of main pass-band. Based on the study of rectangular ring defected ground structure, a 5-order microstrip LPF(low-pass filter) was designed using the single-pole band-stop and slow-wave characteristics of the rectangular ring DGS(Defected Ground Structure) and SISS(Step-Impedance Shunt Stub) structure. Compared with traditional LPF, this LPF presents the advantages of compact size, low insertion loss, b

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2

Yang, Zhenxing, Yao Yao, Yi Jin, et al. "Synthesizing and Optimizing of Wide Stopband Low-Pass Filter with Improved Infinite Attenuation Unit Based on Stubs." Frequenz 72, no. 11-12 (2018): 523–31. http://dx.doi.org/10.1515/freq-2017-0217.

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Abstract Currently, most microwave filters are designed using sophisticated computer-aided design (CAD) tools, which primarily based on the insertion loss method. The image parameter method (IPM), which can provide an effective control for the passband and stopband of microwave filters without any use of lumped prototypes, is paid little attention to microwave filter design. In this paper, the detailed design procedures for synthesizing microwave low-pass filter (LPF) and optimizing the performance of Butterworth filter with IPM are proposed. Based on the IPM, the improved infinite attenuation

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3

Ma, Yan Bing, Huai Wu Zhang, Wei Wei Ling, and Ying He. "Design of a LTCC Low Pass Filter." Advanced Materials Research 403-408 (November 2011): 1704–7. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.1704.

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In this paper, the main work is focused on the design, simulation and fabrication of 2012-type low pass filter(LPF) using the technology of low temperature co-fired ceramic(LTCC). The three-order and -type LPF with 130MHz cut-off frequency and 260MHz out-band rejection is successfully implemented using two kinds of green tape with relative permittivity of 14 and relative permeability of 60 respectively. The measured results agree well with the simulated data and the design process is proved to be effective and reasonable.

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4

Ertay, Agâh Oktay, Mehmet Abbak, and Serkan Şimşek. "An improved stopband and sharp roll off microstrip low pass filter with defected ground structures." International Journal of Microwave and Wireless Technologies 8, no. 3 (2015): 573–81. http://dx.doi.org/10.1017/s175907871500094x.

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In this paper a novel low pass filter (LPF) design procedure is proposed for electromagnetic bandgap based microstrip filters without using classical filter design approach. LPF is designed for ultra-wide stopband and sharp roll-off rate via proposed design procedure. It has been shown that finite periodic fan-shaped defected ground structures (FSDGSs) and double radial stubs (DRSs) yield broad stopband and very sharp transition band. The proposed LPF has −3 dB passband from dc to 1.49 GHz, and −20 dB broad stopband from 1.65 GHz up to 7.41 GHz. Full wave electromagnetic (EM) simulation of the

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5

Smirnov, A. V. "The analysis of conditions for preservation of gain-frequency and phase-frequency characteristics optimality under analog and digital filters transformation." Russian Technological Journal 8, no. 2 (2020): 43–58. http://dx.doi.org/10.32362/2500-316x-2020-8-2-43-58.

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Prototype filters have wide usage for the design of filters with required quality indexes (QI) of gain-frequency response (GFR). The designed filter is obtained from a prototype filter b means of frequency transformation, which preserves these QI. But most of employed frequency transformations result in variations of QI of phase-frequency response (PFR). In this paper we proposed to use prototype filters that are Pareto-optimal for QI of GFR and PFR. Transfer functions of these filters may be found by means of heuristic optimization algorithms. This method will be efficient if the frequency tr

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6

Zhang, Jin, Ruosong Yang, and Chen Zhang. "High-Performance Low-Pass Filter Using Stepped Impedance Resonator and Defected Ground Structure." Electronics 8, no. 4 (2019): 403. http://dx.doi.org/10.3390/electronics8040403.

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A microstrip low-pass filter (LPF) using reformative stepped impedance resonator (SIR) and defected ground structure (DGS) is proposed in this paper. The proposed filter not only possesses the advantage of high frequency selectivity of SIR hairpin LPF with internal coupling, but also possesses the large stop-band (SB) bandwidth by adjusting the number and area of DGS units. The LPF proposed in this paper possesses the properties of miniaturization, wide SB, high selectivity, and low pass-band ripple (PBR) simultaneously. The characteristic parameters of the proposed LPF is that: the pass-band

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7

Chervinskiy, Evgeniy N. "DESIGN OF BAND-PASS FILTERS WITH NON-EQUIRIPPLE FREQUENCY RESPONSES." Journal of the Russian Universities. Radioelectronics 22, no. 3 (2019): 5–23. http://dx.doi.org/10.32603/1993-8985-2019-22-3-5-23.

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Introduction. Band-pass filters circuit elements can be calculated by converting low-pass filter (LPF) parameters, which is the prototype of the designed band-pass filter. The conversion causes problems in case calculated values of circuit elements (resistors and capacitors) are out of standard values determined by the GOST standard. Obviously, frequency characteristics of band-pass filters are distorted when replacing the calculated values of circuit elements by the standard ones. The number of circuit elements with values different from standard can be reduced to zero by solving an additiona

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8

Khairil, Anuar Khairi, Faizal Jamlos Mohd, Padmanathan Surentiran, Aminudin Jamlos Mohd, and Mohamad Isa Muammar. "Low insertion loss of surface mount device low pass filter at 700 MHz." Bulletin of Electrical Engineering and Informatics 8, no. 2 (2019): 382–88. https://doi.org/10.11591/eei.v8i2.1386.

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The paper involved with the design, simulation and fabrication of 6th order elliptical-based Surface Mount Device (SMD) LPF with cutoff frequency at 700 MHz. Fabricated LPF is consisted of four PCB layers which components of SMD are soldered on the top layer. Another three layers is for grounding and shielding, power supply and grounding void. The four layers is crucial to avoid interference between components. The research has find out that the momentum simulation is definitely required to improve the signals response compared to a normal simulation by ADS software. The comparison between mom

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9

Lin, Yang, Zhi Qun Li, Chen Jian Wu, Meng Zhang, and Zeng Qi Wang. "Design of Low Voltage Low Power LPF for WSN Node." Advanced Materials Research 760-762 (September 2013): 54–59. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.54.

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A fourth-order low-pass continuous-time filter for a WSN transmitter is presented. The active RC filter was chosen for the high linearity, designed by using the leapfrog topology imitates the passive filter. The operation amplifier (op-amp) adopted by the filter is feed-forward operation amplifier, which could get the GBW as large as possible under the low power consumption. The cut-off frequency deviation due to the process corner, aging and temperature deviation is adjusted by an automatic frequency tuning circuit. The filter in a 0.18μm RF CMOS technology consumes 1mW from a 1V power supply

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10

Elmahjouby, Sghir, Errkik Ahmed, Zbitou Jamal, Oulhaj Otman, Lakhssassi Ahmed, and Latrach Mohamed. "Miniaturized ultra-wideband coplanarwaveguide lowpass filter with extended stop band." Indonesian Journal of Electrical Engineering and Computer Science 19, no. 3 (2020): 1415–19. https://doi.org/10.11591/ijeecs.v19.i3.pp1415-1419.

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In this article, we propose a novel design of large rejected band of miniaturized ultra wide band (UWB) of a planar CPW low pass filter “LPF” based on the use of periodic elements of &bdquo;e" slots. The goal of this work is to develop a new structure of Low Pass Filter with the following criterion: Miniature, Compact and Easy for Fabrication. The Miniaturization of this structure is achieved by entering the 'e' slot in etching area in the ground of CPW line, to save the standard gap of the adapted coplanar line. The designed coplanar LPF is a compact filter having a large

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11

Mohammed, Bendaoued, Mandry Rachid, El Abdellaoui Larbi, Fouad Aytouna, Latrach Mohamed, and Lakhssassi Ahmed. "Coplanar waveguide low pass filter based on square complementary split ring resonator with wide rejection." TELKOMNIKA Telecommunication, Computing, Electronics and Control 18, no. 5 (2020): 2314~2319. https://doi.org/10.12928/TELKOMNIKA.v18i5.15862.

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In this paper, we present a novel coplanar waveguide low pass filter (LPF) structure based on the use of square complementary split ring resonators (CSRRs) in order to enhance the performances of a low pass filter. Especially, to enlarge the bandwidth of the LPF, the insertion losses and to increase the rejection of the LPF. The CSRRs are optimised and inserted periodically along the center conductor of the CPW line with a CPW ground integrating stubs permitting to enlarge the bandwidth. The simulation results of this filter show a -3 dB cut-off frequency equal to fc = 5.28 GHz. The designed f

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12

Zhang, Changchun, Long Shang, Yongkai Wang, and Lu Tang. "A CMOS Programmable Fourth-Order Butterworth Active-RC Low-Pass Filter." Electronics 9, no. 2 (2020): 204. http://dx.doi.org/10.3390/electronics9020204.

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This paper presents a low-pass filter (LPF) for an ultra-high frequency (UHF) radio frequency identification (RFID) reader transmitter in standard SMIC 0.18 μm CMOS technology. The active-RC topology and Butterworth approximation function are employed mainly for high linearity and high flatness respectively. Two cascaded fully-differential Tow-Thomas biquads are chosen for low sensitivity to process errors and strong resistance to the imperfection of the involved two-stage fully-differential operational amplifiers. Besides, the LPF is programmable in order to adapt to the multiple data rate st

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13

Abu Bakar, Faizah, Sohiful Anuar Zainol Murad, Rizalafande Che Ismail, and Muzamir Isa. "Digital All-Pass Filter Modeling Based on Desired Group Delay Using Advanced Material: A Review on the Signal Processing Part." Applied Mechanics and Materials 815 (November 2015): 338–42. http://dx.doi.org/10.4028/www.scientific.net/amm.815.338.

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This paper presents a review on three types of techniques in designing digital all-pass filters based on group delay. All the three methods use the same basic concept rooting back to the requirement of a stable transfer function of the filter which should be a minimum-phase type, and the denominator group delay. The most optimized of the three is chosen to be implemented in MATLAB in order to decrease the group delay variation of a 5th order Chebyshev low-pass filter with cut-off frequency of 160 MHz. The digital transfer function of the low-pass filter is obtained from the analog transfer fun

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14

MAHMOUD, SOLIMAN A. "LOW POWER LOW-PASS FILTER WITH PROGRAMMABLE CUTOFF FREQUENCY BASED ON A TUNABLE UNITY GAIN FREQUENCY OPERATIONAL AMPLIFIER." Journal of Circuits, Systems and Computers 19, no. 08 (2010): 1651–63. http://dx.doi.org/10.1142/s0218126610006979.

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In this paper, a sixth-order reconfigurable low pass filter (LPF) is realized using 0.25 μm TSMC CMOS technology. The filter is based on a cascading connection of bi-quadratic active-Gm-RC cells. The active-Gm-RC cells are realized using compensated op-amps with variable transconductance gain and variable compensation capacitors (variable Gm–Cc op-amp). The tuning range of the filter's cutoff frequency is from 77.4 KHz to 37.78 MHz. The filter operates from a single supply of 1.5 V. Simulations results using PSPICE for the proposed reconfigurable LPF are presented.

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15

Ranjan, Rahul, Donggyu Shin, Yoonsik Jung, et al. "Comparative Analysis of Integrated Filtering Methods Using UWB Localization in Indoor Environment." Sensors 24, no. 4 (2024): 1052. http://dx.doi.org/10.3390/s24041052.

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This research delves into advancing an ultra-wideband (UWB) localization system through the integration of filtering technologies (moving average (MVG), Kalman filter (KF), extended Kalman filter (EKF)) with a low-pass filter (LPF). We investigated new approaches to enhance the precision and reduce noise of the current filtering methods—MVG, KF, and EKF. Using a TurtleBot robotic platform with a camera, our research thoroughly examines the UWB system in various trajectory situations (square, circular, and free paths with 2 m, 2.2 m, and 5 m distances). Particularly in the square path trajector

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16

Thakur, Diksha, Kulbhushan Sharma, and Rajnish Sharma. "Design of a Low-Noise Low-Power Fourth Order Complementary Super Source Follower Filter for EEG Applications." ECS Transactions 107, no. 1 (2022): 10969–75. http://dx.doi.org/10.1149/10701.10969ecst.

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Design of a filter for biomedical application is a challenging task owing to its low-power and low-noise values introduced at low frequencies. This paper describes the design of a Complementary Super Source Follower (CSSF-C) Low Pass Filter (LPF) circuit and the same has been compared with Complementary Source Follower (CSF-C) LPF targeted for the detection of EEG signals. Simulated results obtained in Cadence Analog Design Environment using CMOS 0.18 µm technology node shows the CSSF-C LPF circuit emulates gain of -528 mdB, bandwidth of 100 Hz, power consumption of 12.6 nW from 0.5 V supply v

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17

Sghir, Elmahjouby, Ahmed Errkik, Jamal Zbitou, Otman Oulhaj, Ahmed Lakhssassi, and Mohamed Latrach. "Miniaturized ultra-wideband coplanarwaveguide lowpass filter with extended stop band." Indonesian Journal of Electrical Engineering and Computer Science 19, no. 3 (2020): 1415. http://dx.doi.org/10.11591/ijeecs.v19.i3.pp1415-1419.

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<p class="Default">In this article, we propose a novel design of large rejected band of miniaturized ultra wide band (UWB) of a planar CPW low pass filter “LPF” based on the use of periodic elements of ‘e’ slots. The goal of this work is to develop a new structure of Low Pass Filter with the following criterion: Miniature, Compact and Easy for Fabrication. The Miniaturization of this structure is achieved by entering the 'e' slot in etching area in the ground of CPW line, to save the standard gap of the adapted coplanar line. The designed coplanar LPF is a compact filter having a large b

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18

Gusev, B. V., and D. A. Letavin. "Transformations of Three-element Low-pass Filters for Unequal Loads." Ural Radio Engineering Journal 8, no. 3 (2024): 340–53. https://doi.org/10.15826/urej.2024.8.3.003.

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The aim of the work is to analyse and select the methods of converting a symmetrical low-pass filter (LPF) into the asymmetrical one with different source and load resistances. For example, to convert in the half of the symmetrical LPF synthesised for equal loads, all the resistances by the conversion coefficient r are multiplied and connected the converted parts of the filter. Three-element P and T-shaped LPFs with the Chebyshev approximation of the squares of the moduli of the transfer functions |S21(Ω)|2 and the reflection coefficients |S11(Ω)|2 are considered. A comparison of LPFs converte

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19

Khairi, Khairil Anuar, Mohd Faizal Jamlos, Surentiran Padmanathan, Mohd Aminudin Jamlos, and Muammar Mohamad Isa. "Low insertion loss of surface mount device low pass filter at 700 MHz." Bulletin of Electrical Engineering and Informatics 8, no. 2 (2019): 382–88. http://dx.doi.org/10.11591/eei.v8i2.1386.

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Abstract:

The paper involved with the design, simulation and fabrication of 6th order elliptical-based Surface Mount Device (SMD) LPF with cutoff frequency at 700 MHz. Fabricated LPF is consisted of four PCB layers which components of SMD are soldered on the top layer. Another three layers is for grounding and shielding, power supply and grounding void. The four layers is crucial to avoid interference between components. The research has find out that the momentum simulation is definitely required to improve the signals response compared to a normal simulation by ADS software. The comparison between mom

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20

Thakur, Diksha, and Kulbhushan Sharma. "0.342 nW Class-AB enhanced flipped source follower low pass filter for biomedical applications." Review of Scientific Instruments 93, no. 11 (2022): 114709. http://dx.doi.org/10.1063/5.0108207.

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Owing to the impact of process voltage and temperature variations, the design of low-power low-pass filters (LPFs) with improved linearity is still one of the most challenging tasks for effective biological signal processing. This paper presents the design of a fourth-order Class-AB enhanced flipped source follower (EFSF) LPF circuit aimed at the detection of electroencephalography signals. The simulated results attained using complementary metal–oxide–semiconductor 180 nm technology node in Cadence Analog Design Environment demonstrate that the EFSF LPF emulates a DC-gain of −88 mdB with a ba

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21

Chervinskiy, E. N. "Calculation of Band-Pass Filters with Fixed Frequencies of Infinite Attenuation." Journal of the Russian Universities. Radioelectronics 25, no. 4 (2022): 23–40. http://dx.doi.org/10.32603/1993-8985-2022-25-4-23-40.

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Introduction. When calculating band-pass filters (BPF) with infinite attenuation frequencies using the frequency conversion method, the parameters of the prototype – an inverse or quasi-elliptic low-pass filter (LPF) – are recalculated into BPF parameters according to conventional formulas. Using the selected low-pass filter cutoff frequency and the Q-factor of the band-pass filter, one can select at their discretion only one infinite attenuation frequency (attenuation pole). In order to suppress a pair of concrete frequencies in the attenuation band, the synthesis of BPF should initially fix

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22

Wang, Dafang, Zhenfei Hu, Cheng Zhu, Chuanwei Zhou, and Yajing Xie. "Stator Flux Observer for Induction Motor Based on Tracking Differentiator." Mathematical Problems in Engineering 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/927582.

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Voltage model is commonly used in direct torque control (DTC) for flux observing of asynchronous motor. In order to improve low-speed and dynamic performance of the voltage model, a modified low-pass filter (LPF) algorithm is proposed. Firstly, the tracking differentiator is brought in to modulate the measured stator current, which suppresses the measurement noise, and then amplitude and phase compensation is made towards the stator electromotive force (EMF), after which the stator flux is obtained through a low-pass filter. This method can eliminate the dynamic error of flux filtered by LPF a

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23

Kumar, Ashwani, A. K. Verma, and Nainu P. Chaudhari. "DESIGN OF BESSEL LOW PASS FILTER USING DGS WITH IMPROVED CHARACTERISTICS FOR RF/MICROWAVE APPLICATIONS." Journal of Circuits, Systems and Computers 23, no. 09 (2014): 1450122. http://dx.doi.org/10.1142/s0218126614501229.

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We report a synthesis process to design the defected ground structure (DGS)-based Bessel lowpass filter (LPF). For 5-pole LPF at fc = 2.5 GHz, its selectivity is 10.6 dB/GHz and for the DGS-based Butterworth LPF it is 12.6 dB/GHz. For the lumped elements Bessel LPF, it is only 4.84 dB/GHz. Its 20 dB rejection bandwidth is 13.1 GHz and impedance matching BW is 76%, as against 88.8% for Butterworth LPF. At fc = 7.5 GHz, the 5-pole DGS Bessel LPF has selectivity 7 dB/GHz, 20 dB rejection BW is 13 GHz and 10 dB return loss (RL) BW in passband is 4.86 GHz (64.8%) with less than 7.9 pS group delay (

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24

Kumngern, Montree, Fabian Khateb, and Tomasz Kulej. "Single EX-CCCII-Based First-Order Versatile Active Filter." Applied Sciences 14, no. 16 (2024): 7396. http://dx.doi.org/10.3390/app14167396.

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This paper presents a new current-mode first-order versatile active filter employing one extra-x second-generation current controlled current conveyor (EX-CCCII) and one grounded capacitor. The proposed filter can realize first-order filtering functions of a low-pass filter (LPF), high-pass filter (HPF), and all-pass filter (APF) within the same topology with low-input and high-output impedances required for current-mode circuits. This multiple-output EX-CCCII-based filter can provide six transfer functions as both non-inverting and inverting filtering functions of the LPF, HPF, and APF are ob

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25

Xiao, Yang, and Lin Li. "A Very Compact and Sharp Roll-Off Low-Pass Filter with Four Transmission Zeros." Active and Passive Electronic Components 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/806276.

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A novel structure with sharp roll-off, wide stopband, and very compact size is presented in this paper. By combining a capacitor-embedded transmission line ring and two shunt open stubs, this structure exhibits a high-performance three-pole low-pass filter (LPF) response with four generated transmission zeros. With the help of these four transmission zeros, the proposed LPF achieves improved roll-off rate, extended stopband, and significantly very compact size. To verify the feasibility of the proposed structure, a prototype LPF having the cut-off frequency at 0.63 GHz is designed, fabricated,

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Gan, Huijun, Dongsheng Yu, Dongkun Li, and He Cheng. "Binary memcapacitor based first-order active filter." Circuit World 46, no. 2 (2020): 117–24. http://dx.doi.org/10.1108/cw-06-2019-0061.

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Purpose The purpose of this paper is to construct a flux-controlled memcapacitor (MC) emulator without grounded restriction with the binary operation ability. The active first-order low-pass filter (LPF) and high-pass filter (HPF) circuits are constructed by replacing the capacitor with MC. Design/methodology/approach The output saturation of the active device is innovatively adopted to realize the binary operation of MC with two memcapacitance values. By applying the direct current control voltage together with the input signal, the memcapacitance can be controlled, and hence, cut-off frequen

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27

Siahkamari, Hesam, Ehsan Heidarinezhad, Ehsan Zarayeneh, Seyyed Ali Malakooti, Seyyed Mohammad Hadi Mousavi, and Payam Siahkamari. "Design of compact microstrip low-pass filter with analytical sharpness of transition band." International Journal of Microwave and Wireless Technologies 8, no. 7 (2015): 1017–22. http://dx.doi.org/10.1017/s1759078715000689.

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A novel microstrip low-pass filter (LPF) using radial patched resonator and modified T-shaped resonators is designed to achieve ultra-wide stop-band. Also, the designed LPF has successfully addressed the problems of compactness and insertion loss, simultaneously. LC equivalent circuit of the proposed filter is calculated and equation for the sharpness in transition band is obtained based on LC equivalent circuit and transfer function. The proposed filter not only exhibits a very wide stop-band of 168%, but also is able to suppress the 11th-harmonic response in conjunction with a small size of

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Sutkovyi, P., Yu Minov, P. Shpylovyi, Ye Melnyk, and M. Mudrenko. "Optimization of low-pass filters in a flux transformer of a SQUID magnetometer for MCG studies." Low Temperature Physics 48, no. 7 (2022): 515–19. http://dx.doi.org/10.1063/10.0011597.

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Research and optimization of a passive low-pass filter (LPF) for a magnetic flux transformer of superconducting quantum interferometric detector (SQUID) operating in a magnetocardiographic (MCG) system, in an unshielded room, under the influence of electromagnetic interference of significant intensity have been carried out. The amplitude-frequency characteristics (AFC) of the LPF in the SQUID magnetic flux transformer are calculated for various shunt circuits, including the LPF circuit recommended by “Supracon” group for its CE2 blue model of the SQUID. The analysis of LPF circuits and their f

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Wu, Kelu, Yongchao Zhang, Wenqi Lu, Lei Sun, Luojun Wang, and Weimin Shi. "Online Mechanical Resonance Frequency Identification Method Based on an Improved Second-Order Generalized Integrator—Frequency-Locked Loop." Electronics 13, no. 16 (2024): 3310. http://dx.doi.org/10.3390/electronics13163310.

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To address the issue of mechanical resonance frequency detection in dual-inertia servo systems, this paper proposes an online identification method for mechanical resonance frequency using a low-pass filter and cascaded second-order generalized integrator—frequency-locked loop (LPF-CSOGI-FLL). Initially, the cascaded second-order generalized integrator—frequency-locked loop (CSOGI-FLL) is employed to eliminate the interference of direct current (DC) bias in resonance frequency identification. From a dual-stage structural perspective, the first second-order generalized integrator (SOGI-FLL) act

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Liew, Hui Fang, Syed Idris Syed Hassan, Mohd Fareq bin Abd Malek, et al. "Design of Compact Composite Microstrip Low Pass Filter Using MEMS Technology." Applied Mechanics and Materials 754-755 (April 2015): 581–90. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.581.

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This paper presents the design technique of a compact composite microstrip filter operating at ultra high frequency (UHF) band and its fabrication using micro-electro mechanical system MEMS technology. The fringing compensation method is applied into the design of the microstrip line transformation from lumped element. The filter lumped circuits and microstrip line circuit were designed and simulated using Advanced Design Software (ADS) and fabricated on silicon substrates to obtain the best filter characteristic based on S-parameter. The measured and simulated results have achieved a good agr

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Roshani, Saeed. "A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells." International Journal of Microwave and Wireless Technologies 9, no. 5 (2016): 1023–27. http://dx.doi.org/10.1017/s1759078716001161.

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In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The −3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss is <0.1 dB in the passband. The proposed LPF presents extremely wide stopband from 1.68 to 44 GHz, with more than the −20 dB attenuation level, which suppresses the 2nd to 29th harmonics with high rejection levels. The size of the proposed LPF is

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32

Kim, In-seon, Beom-Jun Park, Cheol-Soo Lee, Joo-Rae Park, and Ghi-Back Kim. "Novel Low-Pass Filter Structures Using Spur-Lines to Generate Additional Attenuation Poles." International Journal of Electrical and Electronics Research 11, no. 2 (2023): 473–77. http://dx.doi.org/10.37391/ijeer.110230.

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We propose two novel low-pass filter (LPF) structures that have generated additional attenuation poles from applying spur-lines to typical open-stub LPFs. The first structure has the spur-lines added to the serial lines, and the second structure has the spur-lines added to the parallel open stub. From the characteristic analyses of the filters with the proposed design, it was confirmed that the length of the spur-line was an important variable for controlling the stopband bandwidth and attenuation depth. The two types of LPFs were fabricated and then validated by the agreement between the theo

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33

Chervinskiy, E. N. "Direct Calculation of Band-Pass Filters." Journal of the Russian Universities. Radioelectronics 25, no. 6 (2022): 6–21. http://dx.doi.org/10.32603/1993-8985-2022-25-6-6-21.

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Introduction. When calculating band-pass filters (BPF), the circuit elements can be determined by converting the parameters of prototype low-pass filters (LPF). In a number of cases, the synthesized BPF does not have a direct prototype in the low-frequency range. Such filters include, e.g., BPFs with nodes tied to zero potential and other types of filters. Filters can be calculated directly by equating the coefficients of the synthesized filter transfer function (TF) and the realized TF obtained from the low-pass filter TF by the frequency conversion followed by solving the corresponding syste

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Pavlovskyi, V. O., V. K. Gurin, and O. M. Yurchenko. "ANALYSIS OF ELECTROMAGNETIC PROCESSES IN THE "VOLTAGE LIMITER - LOW-FREQUENCY FILTER" CIRCUIT DURING THE INFLUENCE OF HIGH-VOLTAGE SURGE FROM THE POWER SUPPLY NETWORK." Tekhnichna Elektrodynamika 2023, no. 4 (2023): 37–42. http://dx.doi.org/10.15407/techned2023.04.037.

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In the work, a theoretical analysis of high-voltage surge (HVS) passing from a power supply network through the path "voltage limiter - low-pass filter" is carried out, with the aim to evaluate the effectiveness of the filter on reducing the amplitude of the residual HVS at the input of electrical and/or radio-electronic equipment. As a low-pass filter (LPF), an L-shaped filter was chosen. Typical means of limiting the amplitude of the HVS (gas-filled arresters, varistors, and suppressors) are analyzed, and their shortcomings are shown. The justification of the equivalent scheme for theoretica

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Liu, Haiwen, Xiaowei Sun, and Zhengfan Li. "A New Parameter-Extraction Method for DGS and its Application to the Low-Pass Filter." Active and Passive Electronic Components 27, no. 2 (2004): 119–23. http://dx.doi.org/10.1080/08827510310001616812.

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A new and simple parameter-extraction method for the equivalent circuit of defected ground structure (DGS) is presented. Using this method, circuit simulation, based on the DGS equivalent-circuit model, show excellent agreements with the electromagnetic (EM) simulation. Further, our method is applied effectively to design a low-pass filter (LPF) with DGS. Comparison between simulation and measurement confirm the validity of the LPF configuration and design procedure. Simple structure and high power handling capability are obtained from the proposed LPF.

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Roshani, Sobhan, Salah I. Yahya, Shahram Khazaei, Saeed Roshani, and Babak Karami. "Design and Fabrication of a Microstrip Low-Pass Filter with a Wide Stopband Using a Windmill-Shaped Resonator." ARO-THE SCIENTIFIC JOURNAL OF KOYA UNIVERSITY 12, no. 2 (2024): 201–8. https://doi.org/10.14500/aro.11752.

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In this paper, a microstrip low-pass filter (LPF) with a wide stopband and a sharp transition band is presented using a windmill-shaped resonator. Traditional LPF designs often face challenges such as narrow stopbands, high insertion loss, and large physical sizes, which limit their performance in modern communication systems. To address these challenges, the proposed filter exhibits low insertion loss, a sharp response in the transition band, a wide stopband, and a compact size. The windmill-shaped resonator is applied to achieve a sharp response in the transition band, while two suppressor c

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Kumngern, Montree, Fabian Khateb, and Tomasz Kulej. "Novel Multiple-Input Single-Output Shadow Filter with Improved Passband Gain Using Multiple-Input Multiple-Output DDTAs." Electronics 14, no. 7 (2025): 1417. https://doi.org/10.3390/electronics14071417.

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This paper presents a multiple-input single-output (MISO) shadow filter implemented using multiple-input differential difference transconductance amplifiers (MI-DDTAs). The MI-DDTA’s multiple inputs are realized through the multiple-input bulk-driven MOS transistor (MI-BD MOST) technique. Leveraging the multiple-input capability of the DDTA, various filter responses—low-pass filter (LPF), high-pass filter (HPF), band-pass filter (BPF), band-stop filter (BSF), and all-pass filter (APF)—can be efficiently achieved by appropriately configuring the input signals. The natural frequency and quality

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Ranjan, Ashish, Subrahmanyam Perumalla, Ravi Kumar, Vista John, and Shantikumar Yumnam. "Second Order Universal Filter Using Four Terminal Floating Nullor (FTFN)." Journal of Circuits, Systems and Computers 28, no. 06 (2019): 1950091. http://dx.doi.org/10.1142/s0218126619500919.

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In this research paper, a voltage mode second order universal filter using Four Terminal Floating Nullor (FTFN) is presented. The proposed design uses Three Input Single Output (TISO) for the realization of all filter responses namely Low Pass Filter (LPF), High Pass Filter (HPF), Band Pass Filter (BPF), Notch Filter (NF) and All Pass Filter (APF) by using proper input selection. The analog building block, FTFN is simply realized with two commercially available AD844 ICs. The proposed second order universal filter comes with a single FTFN block with four passive components in which no componen

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Lee, Dong Geun, Taeyong Jeong, and Keum Cheol Hwang. "Design of a Wide-Beamwidth Pixelated Dielectric Resonator Antenna Using a Modified Stepped-Impedance Filter to Suppress Harmonics." Applied Sciences 12, no. 15 (2022): 7765. http://dx.doi.org/10.3390/app12157765.

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This study designed a wide-beamwidth pixelated dielectric resonator antenna (DRA) combined with a low-pass filter (LPF) to suppress harmonics. The DRA was designed to create a wide-beam pattern with a pixelated structure. The pixelated DRA was optimized by a genetic-learning particle swarm optimization algorithm. To prevent significant higher-mode radiation and harmonics from occurring in the DRA, an LPF was included in its feeding line. The filter had a seventh-order Chebyshev design, and a hybrid step-impedance filter was proposed by modifying the step-impedance filter for use in narrow spac

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Singh, Niraj Kumar, Kumaran Thirunavukkarasu, and Animesh Barman. "Optimum Response Filter Setting for Air Conduction–Induced Ocular Vestibular Evoked Myogenic Potential." Journal of the American Academy of Audiology 30, no. 09 (2019): 753–63. http://dx.doi.org/10.3766/jaaa.17098.

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AbstractA wide range of normative values of amplitude and latencies can be noticed in the publications on ocular vestibular evoked myogenic potential (oVEMP), possibly because of the inconsistent use of various stimulus and acquisition-related parameters such as response filter, gaze angle, onset polarity of stimulus, etc. One major nonuniform parameter across studies is the response filter. Several band-pass response filters such as 0.5–500, 1–1000, 5–500, 5–800, 10–750, 20–2000, 100–3000, and 200–1000 Hz have been used across published studies, and a wide range of normative values can be not

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Musa, Yusup Lada, Amran Mohd Radzi Mohd, Jasni Jasronita, Hizam Hashim, Jidin Auzani, and Hisham Mohamad Syahrul. "Evaluation of CHB MLI based shunt APF using low pass filter and self-tuning filter." Evaluation of CHB MLI based shunt APF using low pass filter and self-tuning filter 31, no. 3 (2023): 1274–85. https://doi.org/10.11591/ijeecs.v31.i3.pp1274-1285.

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The increasing demand for high-rating power supply in the distribution system causes the conventional inverter topology, six step voltage source inverter (SSVSI) unsuitable for being applied as active power filter (APF). Multilevel inverter (MLI) is generally the best suitable inverter for APF, but not all types of MLI can be used for high-voltage applications. Among the MLIs topology, cascaded H-bridge (CHB) is the best choice since it can produce output voltage more than twice the amount of DC source. Moreover, CHB MLI topology uses fewer power devices and is simple in design. Low pass filte

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Tasneem, Sadaf, Rajeev Kumar Ranjan, Sajal K. Paul, and Norbert Herencsar. "Power-Efficient Electronically Tunable Fractional-Order Filter." Fractal and Fractional 8, no. 1 (2023): 31. http://dx.doi.org/10.3390/fractalfract8010031.

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This article describes a low-voltage, low-power fractional-order low-pass filter (FO-LPF) of order 1 + α, which is implemented using a voltage differencing differential difference amplifier (VDDDA). The VDDDA structure is implemented using the bulk-driven metal oxide semiconductor transistor technique. The transistors operate in the subthreshold region to maintain low-supply voltage and low-power consumption. The FO-LPF structure implemented using this VDDDA structure is compact. It includes three VDDDAs and three grounded capacitors along with two active resistors implemented using MOS transi

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Kiela, Karolis, Marijan Jurgo, Vytautas Macaitis, and Romualdas Navickas. "Wideband Reconfigurable Integrated Low-Pass Filter for 5G Compatible Software Defined Radio Solutions." Electronics 10, no. 6 (2021): 734. http://dx.doi.org/10.3390/electronics10060734.

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This article presents a wideband reconfigurable integrated low-pass filter (LPF) for 5G NR compatible software-defined radio (SDR) solutions. The filter uses Active-RC topology to achieve high linearity performance. Its bandwidth can be tuned from 2.5 MHz to 200 MHz, which corresponds to a tuning ratio of 92.8. The order of the filter can be changed between the 2nd, 4th, or 6th order; it has built-in process, voltage, and temperature (PVT) compensation with a tuning range of ±42%; and power management features for optimization of the filter performance across its entire range of bandwidth tuni

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Prommee, Pipat, Natapong Wongprommoon, Montree Kumngern, and Winai Jaikla. "Low-Voltage Low-Pass and Band-Pass Elliptic Filters Based on Log-Domain Approach Suitable for Biosensors." Sensors 19, no. 24 (2019): 5581. http://dx.doi.org/10.3390/s19245581.

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This research proposes bipolar junction transistor (BJT)-based log-domain high-order elliptic ladder low-pass (LPF) and band-pass filters (BPF) using a lossless differentiator and lossless and lossy integrators. The log-domain lossless differentiator was realized by using seven BJTs and one grounded capacitor, the lossy integrator using five BJTs and one grounded capacitor, and the lossless integrator using seven BJTs and one grounded capacitor. The simplified signal flow graph (SFG) of the elliptic ladder LPF consisted of two lossy integrators, one lossless integrator, and one lossless differ

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Qian, Lei, and Xiang Ning Fan. "Design of an Active-Gm-RC Reconfigurable Filter for the Multi-Mode Receiver." Applied Mechanics and Materials 364 (August 2013): 458–62. http://dx.doi.org/10.4028/www.scientific.net/amm.364.458.

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Based on TSMC 0.18m RF CMOS process a reconfigurable low-pass filter (LPF) is presented in this paper. The LPF adopts active-Gm-RC structure. By manually adjusting the capacitor arrays, the LPF can switch working mode and correct frequency offset caused by process deviation. The pre-layout simulation shows that with 1.8V power supply, the bandwidth ranges from 1.4MHz to 9.8MHz with a step of 1.4MHz. The out of band attenuation is about-80dB/10 octave and the power consumption is 0.43mW .

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Song, Sehwan, Junyong Jang, Youlim Lee, Hanseong Jo, and Sang-Hee Yoon. "Prediction on the Performance of Polymer-Based Mechanical Low-Pass Filters for High-G Accelerometers." Journal of the Korea Institute of Military Science and Technology 26, no. 3 (2023): 262–72. http://dx.doi.org/10.9766/kimst.2023.26.3.262.

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A polymer-based mechanical low-pass filter(m-LPF) for high-g accelerometers makes it possible to remove high-frequency transient noises from acceleration signals, thus ensuring repeatable and reliable measurement on high-g acceleration. We establish a prediction model for performance of m-LPF by combining a fundamental vibration model with the fractional derivative standard linear solid(FD SLS) model describing the storage modulus and loss modulus of polymers. Here, the FD SLS model is modified to consider the effect of m-LPF shape factor (i.e., thickness) on storage modulus and loss modulus.

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Khateb, Fabian, Montree Kumngern, Tomasz Kulej, Meysam Akbari, and Viera Stopjakova. "0.5 V, nW-Range Universal Filter Based on Multiple-Input Transconductor for Biosignals Processing." Sensors 22, no. 22 (2022): 8619. http://dx.doi.org/10.3390/s22228619.

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This paper demonstrates the advantages of the multiple-input transconductor (MI-Gm) in filter application, in terms of topology simplification, increasing filter functions, and minimizing the count of needed active blocks and their consumed power. Further, the filter enjoys high input impedance, uses three MI-Gms and two grounded capacitors, and it offers both inverting and non-inverting versions of low-pass (LPF), high-pass (HPF), band-pass (BPF), band-stop (BS) and all-pass (AP) functions. The filter operates under a supply voltage of 0.5 V and consumes 37 nW, hence it is suitable for extrem

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Yusup Lada, Musa, Mohd Amran Mohd Radzi, Jasronita Jasni, Hashim Hizam, Auzani Jidin, and Syahrul Hisham Mohamad. "Evaluation of CHB MLI based shunt APF using low pass filter and self-tuning filter." Indonesian Journal of Electrical Engineering and Computer Science 31, no. 3 (2023): 1274. http://dx.doi.org/10.11591/ijeecs.v31.i3.pp1274-1285.

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The increasing demand for high-rating power supply in the distribution system causes the conventional inverter topology, six step voltage source inverter (SSVSI) unsuitable for being applied as active power filter (APF). Multilevel inverter (MLI) is generally the best suitable inverter for APF, but not all types of MLI can be used for high-voltage applications. Among the MLIs topology, cascaded H-bridge (CHB) is the best choice since it can produce output voltage more than twice the amount of DC source. Moreover, CHB MLI topology uses fewer power devices and is simple in design. Low pass filte

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Letavin, D. A., B. V. Gusev, and S. T. Knyazev. "Investigation of Quadrature Couplers on Concentrated LC-elements." Ural Radio Engineering Journal 8, no. 3 (2024): 354–70. https://doi.org/10.15826/urej.2024.8.3.004.

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The article demonstrates how the choice of the filter approximation type affects the frequency characteristics of a directional coupler in which they are installed instead of quarter-wavelength sections for its miniaturization. The paper presents the results of modeling T-shaped and П-shaped low-pass filters (LPF) using the QucsStudio package. Various characteristics of coupler are investigated, including reflection and transmission coefficients, as well as the phase difference between the signals. The authors come to the conclusion that П-shaped circuits should be used to reduce the size of t

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Dixit, Ashish, Geetika Srivastava, Anil Kumar, and Sachchida Nand Shukla. "Low power CMOS Gm-C based low pass filter for front end neural signal processing." International Journal of Power Electronics and Drive Systems (IJPEDS) 15, no. 1 (2024): 559. http://dx.doi.org/10.11591/ijpeds.v15.i1.pp559-565.

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The sub 100 µV voltage levels and sub 100 Hz frequency range makes the processing of most popular signal electroencephalograph (EEG) for brain functionality analysis, a complex task. The low frequency content of EEG (useful signals below 70 Hz) is commonly used for diagnosis of various brain related disorders making low-pass filter (LPF) a key block in front-end processing as noise reduction and resolution enhancement is crucial for precise recovery of these information. This paper is aimed to design reduced transconductance (Gm) based low power and small area CMOS LPF with cutoff frequency (f

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