COMPACT MICROSTRIP BAND-PASS FILTER FOR EMI REDUCTION

2015 ◽  
Vol 77 (12) ◽  
Author(s):  
Kabir Ibrahim Jahun ◽  
Hussein Mohamed Hagi Hassan Abdirahman Mohamud Shire ◽  
Ali Orozi Sougui ◽  
S. H. Dahlan
Keyword(s):  
Filter Design ◽  
Stop Band ◽  
Band Pass Filter ◽  
Defected Ground Structure ◽  
Coupled Line ◽  
Pass Filter ◽  
Filter Structure ◽  
Coupled Lines ◽  
Band Pass ◽  
Compact Design

Compact microstrip band-pass filter design using parallel coupled lines is presented in this paper. The microstrip lines are calculated and constructed using CST studio with two input and output ports of the filter structure are printed over Defected Ground Structure (DGS).The proposed symmetrical structure offers a simple and compact design while exhibiting an improved stop-band characteristics in comparison to conventional coupled microstrip line filter structure. The simulation and measurements of 2GHz prototype band pass filter are presented. The measured result agrees well with the simulation data. Compared with conventional parallel coupled line band pass filter, the second, third and fourth spurious responses are suppressed; in addition, the size of the prototype filter circuit is reduced up to 20.8%.  

scholarly journals Wideband Band-Pass Filter Design Using Coupled Line Cross-Shaped Resonator

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2173
Author(s):  
Dong-Sheng La ◽  
Xin Guan ◽  
Shuai-Ming Chen ◽  
Yu-Ying Li ◽  
Jing-Wei Guo
Keyword(s):  
Bandpass Filter ◽  
Filter Design ◽  
Design Method ◽  
Band Pass Filter ◽  
Coupled Line ◽  
Pass Filter ◽  
Transmission Zeros ◽  
Coupled Lines ◽  
Band Pass ◽  
Line Cross

In this paper, a wideband bandpass filter with a coupled line cross-shaped resonator (CLCSR) is proposed. The proposed bandpass filter is composed of two open-end parallel coupled lines, one short-end parallel coupled line, one branch microstrip line, and the parallel coupled line feed structure. With the use of the even and odd mode approach, the transmission zeros and transmission poles of the proposed bandpass filter are analyzed. The coupling coefficient of the parallel coupled line feed structure is big, so the distance between the parallel coupled line is too small to be processed. A three microstirp lines coupled structure is used to realize strong coupling and cross coupling. This structure also can reduce the return loss in passband and increase the out-of-band rejection. The transmission zeros can be adjusted easily by varying the lengths of the open-end parallel coupled line or the short-end parallel coupled line. The proposed bandpass filter is fabricated and measured. The simulated results agree well with the measured ones, which shows that the design method is valid.

Digital Stable IIR Band Pass Filter Design Using Seeker Optimization Technique

2014 ◽  
Vol 905 ◽  
pp. 406-410 ◽  
Author(s):  
S.K. Saha ◽  
Rajib Kar ◽  
D. Mandal ◽  
S.P. Ghoshal
Keyword(s):  
Filter Design ◽  
Fitness Function ◽  
Stop Band ◽  
Infinite Impulse Response ◽  
Pass Band ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Iir Filter ◽  
Real Coded Genetic Algorithm ◽  
Band Pass

This paper presents a novel, control parameter independent evolutionary search technique known as Seeker Optimization Algorithm (SOA) for the design of a eighth order Infinite Impulse Response (IIR) Band Pass (BP) filter. A new fitness function has also been adopted in this paper to improve the stop band attenuation to a great extent. The performance of the SOA based IIR BP filter design has proven to be much superior as compared to those obtained by real coded genetic algorithm (RGA) and standard particle swarm optimization (PSO) in terms of highest sharpness at cut-off, smallest pass band ripple, highest stop band attenuation, smallest stop band ripple and also the fastest convergence speed with assured stability recognized by the pole-zero analysis of the designed optimized IIR filter.

Compact and novel coupled line microstrip bandpass filter based on stepped impedance resonators for millimetre-wave communications

Frequenz ◽  
2021 ◽  
Vol 75 (5-6) ◽  
pp. 147-152
Author(s):  
Zahid A. Bhat ◽  
Javaid A. Sheikh ◽  
Sharief D. Khan ◽  
Raqeebur Rehman ◽  
Shazia Ashraf
Keyword(s):  
Filter Design ◽  
Low Cost ◽  
Future Generation ◽  
Band Pass Filter ◽  
Coupled Line ◽  
Pass Filter ◽  
Millimetre Wave ◽  
Band Pass ◽  
Sharp Rejection ◽  
Good Agreement

Abstract This paper presents a compact and the low-cost coupled line band-pass filter with application to future generation millimetre-waves and 5G communications. The proposed approach of the filter design is based on the coupled-line and centre tapped upper and lower stepped impedance resonators. These resonators generate the sharp rejection, wide bandwidth, and abet to realize the compact filter. A detailed theoretical as well as the numerical analysis of the filter has also been investigated. As a demonstration, the proposed band-pass filter configuration has been designed and fabricated at the 33.5 GHz frequency using a low-cost PCB technique. It has observed that the proposed filter, results in a better return loss and the low insertion loss. The experimental results has been presented and compared with the simulated results and has found quite satisfactory. Moreover the results obtained validate a good agreement with each other.

A Reduced-Size Microstrip Four Poles Hairpin Band-Pass Filter with Multilayer Parallel-Coupled Line for Satellite Broadcasting

2020 ◽  
Author(s):  
Qazwan Abdullah Tarbosh ◽  
Nor Shahida Mohd Shah ◽  
Bishwajeet Pandey ◽  
Adeeb Salh ◽  
Nabil Farah ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Bandpass Filter ◽  
Filter Design ◽  
Center Frequency ◽  
Design System ◽  
Band Pass Filter ◽  
Coupled Line ◽  
Pass Filter ◽  
Satellite Broadcasting ◽  
Band Pass

Recently, a multilayer structure is very imperative to minimize the size of planar microstrip filters. In the flexible design and incorporation of other microwave components, a multilayer band-pass filter provides another dimension. This paper, therefore, introduces a band-pass filter of 2.52-2.65 GHz for digital broadcast applications using parallel-coupled line (PCL) and multilayer(ML) hairpin resonator. The targeted four-pole resonator has a center frequency of 2.58 GHz with a bandwidth of 130 MHz. The hairpin-line offers compact filter design structures. The proposed configuration of the parallel-coupled line (PCL) resonator is used to design the ML band-pass filter. The FR4 substrate with a dielectric constant (εr) of 4.3 and 1.6 mm thickness was used. Comparison analysis between the simulated insertion loss and the reflection coefficient of substrates RO3003 and FR4 was performed to verify the efficiency of the proposed filter design. Simulation of PCL filter is accomplished using computer simulation technology (CST)and an advanced design system(ADS). The PCL bandpass filter was experimentally validated and good agreement between simulation and measured results were achieved showing a well-measured reflection coefficient. The simulated results of the ML bandpass filter show that the circuit performs well, and the filter size is significantly reduced.

scholarly journals Design of Broadband Band-Pass Filter with Cross-Coupled Line Structure

2020 ◽  
Vol 2020 ◽  
pp. 1-5
Author(s):  
Dong-Sheng La ◽  
Xin Guan ◽  
Hong-Cheng Li ◽  
Yu-Ying Li ◽  
Jing-Wei Guo
Keyword(s):  
Physical Parameters ◽  
Band Pass Filter ◽  
Coupled Line ◽  
Pass Filter ◽  
Simulation And Optimization ◽  
Line Structure ◽  
Transmission Zeros ◽  
Coupled Lines ◽  
Band Pass ◽  
Impedance Parameters

This paper presents a broadband band-pass filter with cross-coupled line structure. The cross-coupled line structure is composed of the parallel coupled lines and an open stub. It can be analyzed by the odd- and even-mode method due to its symmetric structure. There are three transmission poles in the passband and two transmission zeros out of passband. Then, the influence of the impedance parameters on the transmission zeros and transmission poles are analyzed. Then, the physical parameters of the proposed band-pass filter are given. And using HFSS for simulation and optimization, the final insertion loss and return loss of filter are obtained. The simulation and measurement results are in good agreement, which validates the design idea.

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.

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