Design and Optimization of Microstrip Stub Bandstop Filter Based on ADS

2015 ◽  
Vol 743 ◽  
pp. 233-238 ◽  
Author(s):  
Qi Yuan Zhu ◽  
Xiang Li Meng
Keyword(s):  
High Reliability ◽  
Center Frequency ◽  
Design System ◽  
Relative Width ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Design And Optimization ◽  
Short Period ◽  
Low Pass ◽  
Bandstop Filter

Microstrip filter has extensive application in microwave circuit and communication system in the future. We take lumped components low-pass filter as the prototype and employ the Richards transformation and the Kuroda rule to change the low pass prototype into a bandstop filter. By using ADS (Advanced Design System) method we design a microstrip stub bandstop filter, whose center frequency, range of frequency and relative width are respectively 4GHz, 3GHz ~ 5GHz and 8%. And then we further optimize the parameters to get the circuit design layout. It is shown that all indexes reach the design requirements and the method possesses the features such as short period and high reliability.

Design of an Ideal Low Pass Microstrip Line Filter Using the Defected Ground Structure

2018 ◽  
Vol 876 ◽  
pp. 133-137
Author(s):  
Ping Cheng Chen ◽  
Chung Long Pan ◽  
J.D. Huang ◽  
S.H. Hong
Keyword(s):  
Frequency Response ◽  
Microstrip Line ◽  
Geometric Shape ◽  
Center Frequency ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Ansoft Hfss ◽  
Low Pass

A design and simulation for low pass microstrip line filter with defected ground structure has been researched, the main purpose is with the simplest method to design an ideal low pass filter. In this paper, simulated soft (Ansoft HFSS V.6.0) used to be simulated the frequency response under different geometric shape of DGS. The results show good performance of a low pass filter with DGS. Final, a low pass filter with DGS design and fabricated, The properties are shown as flow: center-frequency: 7.28G, S21:-47dB, cut-off frequency: 5.88GHz.

Novel Low-Pass Microwave Filter Based on Rectangular Ring DGS

2013 ◽  
Vol 273 ◽  
pp. 371-374
Author(s):  
Bao Ping Li ◽  
Yan Liang Zhang
Keyword(s):  
Stop Band ◽  
Center Frequency ◽  
Pass Band ◽  
Band Pass Filter ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Compact Size ◽  
Low Pass

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, broad stop-band and high steep. It also validates the requirements of miniaturization and high performance for filters.

Approximate method to estimate the short-period strong motion spectra on bedrock

1981 ◽  
Vol 71 (2) ◽  
pp. 491-505
Author(s):  
Katsuhiko Ishida
Keyword(s):  
Earthquake Swarm ◽  
Strong Motion ◽  
Fourier Amplitude ◽  
Period Range ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Short Period ◽  
Amplitude Spectra ◽  
Low Pass ◽  
Parkfield Earthquake

abstract The methodology to estimate the strong motion Fourier amplitude spectra in a short-period range (T ≦ 1 to 2 sec) on a bedrock level is discussed in this paper. The basic idea is that the synthetic strong motion Fourier spectrum F˜A(ω) calculated from smoothed rupture velocity model (Savage, 1972) is approximately similar to that of low-pass-filtered strong earthquake ground motion at a site in a period range T ≧ 1 to 2 sec: F˜A(ω)=B˜(ω)·A(ω). B˜(ω) is an observed Fourier spectrum on a bedrock level and A(ω) is a low-pass filter. As a low-pass filter, the following relation, A ( T ) = · a · T n a T n + 1 , ( T = 2 π / ω ) , is assumed. In order to estimate the characteristic coefficients {n} and {a}, the Tokachi-Oki earthquake (1968), the Parkfield earthquake (1966), and the Matsushiro earthquake swarm (1966) were analyzed. The results obtained indicate that: (1) the coefficient {n} is nearly two for three earthquakes, and {a} is nearly one for the Tokachi-Oki earthquake, eight for the Parkfield earthquake, and four for the Matsushiro earthquake swarm, respectively; (2) the coefficient {a} is related with stress drop Δσ as (a = 0.07.Δσ). Using this relationship between {a} and Δσ, the coefficients {a} of past large earthquakes were estimated. The Fourier amplitude spectra on a bedrock level are also estimated using an inverse filtering method of A ( T ) = a T 2 a T 2 + 1 .

A semi-lumped microstrip UWB bandpass filter

2009 ◽  
Vol 1 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Darine Kaddour ◽  
Jean-Daniel Arnould ◽  
Philippe Ferrari
Keyword(s):  
Group Delay ◽  
Bandpass Filter ◽  
Filter Design ◽  
Sensitivity Study ◽  
Critical Parameters ◽  
Center Frequency ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
High Pass

In this paper, a miniaturized bandpass filter for ultra-wide-band applications is proposed. It is based on the embedding of high-pass structures in a low-pass filter. A semi-lumped technology combining surface-mounted capacitors and transmission lines has been used. The filter design rules have been carried out. Furthermore, two filters having a 3-dB fractional bandwidth of 142 and 150%, centered at 0.77 and 1 GHz, respectively, have been realized for a proof of concept. Measured characteristics, in good agreement with simulations, show attractive properties of return loss (|S11| <−18 dB), insertion loss (<0.3 dB), and a maximum group delay and group delay variation of 2 and 1.3 ns, respectively. A distributed filter based on the same low-pass/high-pass approach has been also realized and measured for comparison. The size reduction reaches 85% for the semi-lumped filter, and its selectivity is improved with a shape factor of 1.3:1 instead of 1.5:1. The semi-lumped filter's drawback is related to a smaller rejection bandwidth compared to the distributed one. To improve the high-frequency stopband, an original technique for spurious responses suppression based on capacitively loaded stubs has been proposed. Even if the performances do not reach that obtained for the distributed approach, with this technique spurious responses are pushed until eight times the center frequency. A sensitivity study vs. critical parameters has also been carried out, showing the robustness of the design.

scholarly journals Design of CW THz PhotonicTtransmitter based on Low Pass-Filter and Bow-tie Wideband Antenna

2018 ◽  
Vol 8 (5) ◽  
pp. 3801
Author(s):  
Ibtissame Moumane ◽  
J. Zbitou ◽  
M. Latrach ◽  
A. Errkik ◽  
O. Chakkor ◽  
...  
Keyword(s):  
Circuit Design ◽  
Gaas Substrate ◽  
Continuous Wave ◽  
Design System ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Wideband Antenna ◽  
Low Pass ◽  
Rf Signal ◽  
Bow Tie

This paper presents the design of Continuous Wave Terahertz photonic transmitters which is composed from photodetector (PD) associated to a wideband antenna, low–pass filter (LPF) and DC Probe. Firstly, we have developed the bow-tie wideband antenna using an EM solver Momentum integrated in ADS “Advanced Design System”. Then we had optimized a low-pass filter which is responsible of blocking the RF signal providing from the antenna to reach the DC probe. And finally, we have validated into simulation the CW THz photonic transmitter. The three structures are based on multi-layers GaAs substrate, which is the most widely used for THz circuit design. The dimensions of the Whole circuit are 776.788 × 303.39〖μm〗^2.<br /><br />

Study and Design of New Rectenna Structures for Wireless Power Transmission Applications

2020 ◽  
pp. 123-155
Author(s):  
Abdellah Taybi ◽  
Abdelali Tajmouati ◽  
Jamal Zbitou ◽  
Mohamed Latrach
Keyword(s):  
Conversion Efficiency ◽  
Power Supply ◽  
Power Transmission ◽  
Dual Band ◽  
Design System ◽  
Wireless Power ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Remote Sensors ◽  
Low Pass

This chapter presents many research works that have been carried out to deal with the problem of power supply to remote sensors. A 2.45 GHz voltage multiplier rectifier was validated to deliver 18V of output voltage with a conversion efficiency of 69%. Another rectenna was fabricated at 5.8 GHz of the Industrial Scientific Medical band and reach a measured voltage of 7.4V at 18 dBm. The third structure is about a series rectifier working at 2.45 GHz associated with a microstrip low pass filter which produces a supplying voltage of 11.23V. Added to the aforementioned results, the objective in this work is to design, optimize and realize two structures: A dual band patch antenna working at 2.45 GHz and 5.8 GHz, and a compact rectifier circuit at 2.45 GHz for the power supply of low-consumption devices. This rectifier has been designed using Advanced Design System. The bridge topology was employed on an FR4 substrate. A good matching input impedance was observed and high conversion efficiency was obtained. Simulation results have been validated through realization and measurements.

scholarly journals A novel configuration of THz photonic transmitter

2019 ◽  
Vol 13 (1) ◽  
pp. 258
Author(s):  
Ibtissame Moumane ◽  
Jamal Zbitou ◽  
M. Latrach ◽  
A. Errkik ◽  
O. Chakkor
Keyword(s):  
Electrical Signal ◽  
Design System ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
Rf Signal ◽  
Thz Applications ◽  
Thz Waves ◽  
Thz Antenna

In this paper we present a new design of a photonic transmitter based on multi-layers substrate GaAs and using for generation of THz waves. The proposed circuit is composed from a photodetector (PD) “which converts the light to the electrical signal”, THz Antenna, low-pass filter and DC probe. Firstly we have optimized the THz antenna using an EM solver which is Momentum integrated in ADS “Advanced Design System”.Then we have optimized the low pass filter which plays the role of inductance that is an RF choke permiting to separate the RF signal from the DC one. Finally, we have associated the different components, add the DC probe and simulate the whole proposed system. The dimensions of the final circuit are 400.317x167.16 UM2 . The obtain results permit to validate the final circuit at THz and make it suitable for THz applications.

scholarly journals Enhanced neural tracking of the fundamental frequency of the voice

2020 ◽  
Author(s):  
Jana Van Canneyt ◽  
Jan Wouters ◽  
Tom Francart
Keyword(s):  
Fundamental Frequency ◽  
Auditory Nerve ◽  
Neural Response ◽  
Nerve Fibers ◽  
Center Frequency ◽  
Neural Processing ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Low Pass ◽  
The Voice

AbstractObjective‘F0 tracking’ is a novel method that investigates the neural processing of the fundamental frequency of the voice (f0) in continuous speech. Through linear modelling, a feature that reflects the stimulus f0 is predicted from the EEG data. Then, the neural response strength is evaluated through the correlation between the predicted and actual f0 feature. The aim of this study was to improve upon this ‘f0 tracking’ method by optimizing the f0 feature.ApproachSpecifically, we aimed to design a feature that approximates the expected EEG responses to the f0. We hypothesized that this would improve neural tracking results, because the more similar the feature and the neural response are, the easier it will be to reconstruct the one from the other. Two techniques were explored: a phenomenological model to simulate neural processing in the auditory periphery and a low-pass filter to approximate the effect of more central processing on the f0 response. Since these optimizations target different aspects of the auditory system, they were also applied in a cumulative fashion.ResultsResults obtained from EEG evoked by a Flemish story in 34 subjects indicated that both the use of the auditory model and the addition of the low-pass filter significantly improved the correlations between the actual and reconstructed feature. The combination of both strategies almost doubled the mean correlation over subjects, from 0.78 to 0.13. Moreover, canonical correlation analysis with the modelled feature revealed two distinct processes contributing to the f0 response: one driven by the compound activity of auditory nerve fibers with center frequency up to 8 kHz and one driven predominantly by the auditory nerve fibers with center frequency below 1 kHz.SignificanceThe optimized f0 features developed in this study enhance the analysis of f0-tracking responses and facilitate future research and applications.

scholarly journals Crustal structure of the Andes from Rayleigh wave dispersion

1961 ◽  
Vol 51 (3) ◽  
pp. 381-388 ◽  
Author(s):  
Armando Cisternas
Keyword(s):  
Rayleigh Waves ◽  
Theoretical Models ◽  
Wave Dispersion ◽  
Pass Filter ◽  
Low Pass Filter ◽  
The Andes ◽  
Short Period ◽  
Low Pass ◽  
Empirical Curve ◽  
Rayleigh Wave Dispersion

Abstract Records from a Benioff short-period seismograph located at Huancayo, Peru, are digitalized and then passed through a low-pass filter to get the long-period waves. In this way the dispersion curves of Rayleigh waves for paths along the Andes can be computed from seismograms which otherwise would be unusable. The comparison with the empirical curve for a “normal” continental crust (Press 1960) and with specially computed theoretical models indicates a crustal thickness of the order of 50 km. For periods between 20 and 25 sec., the observed group velocity shows abnormally low values.

scholarly journals Design and Analysis of Microstrip Low Pass and Bandstop Filters

2019 ◽  
Vol 8 (3) ◽  
pp. 6944-6951
Keyword(s):  
Communication Systems ◽  
Wireless Communication Systems ◽  
Fractional Bandwidth ◽  
Coupled Line ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Front End ◽  
Low Pass ◽  
Bandstop Filter ◽  
Bandstop Filters

In this paper a simple approach of designing the microstrip low pass and bandstop filter is presented. The microstrip stub based low pass filter with 2.4 GHz and attenuation of more than 60 dB at 4 GHz frequency is designed. The bandstop filter is also designed with notch characteristics at 2.4 GHz frequency. The fractional bandwidth of designed filter is estimated to be 30% with 117 dB of attenuation is recorded at notch frequency of 2.4 GHz in SIR based bandstop filter topology. The bandstop filter is implemented using coupled line structure as well as step impedance resonator techniques. The filters are designed on Roger RC40003C substrate. The design and analysis of filter with its layout and EM simulation is accomplished using Agilent ADS software. These filters can be used in front end transceiver systems, antennas, and modern wireless communication systems.

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