Microstrip band-pass filter with −67 dB stop band up to 8.8 times the pass-band center frequency

2017 ◽  
Vol 9 (10) ◽  
pp. 1937-1944 ◽  
Author(s):  
Frederick Huang
Keyword(s):  
Stop Band ◽  
Center Frequency ◽  
Pass Band ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Center ◽  
Capacitor Coupling ◽  
Band Pass

Step-impedance resonators and step-impedance capacitor coupling pads are introduced to microstrip band-pass filters to suppress spurious stop-band responses up to the ninth order, thereby providing a very wide stop band. Combined with improvements in existing suppression techniques, the overall suppression in one of the filters, with 1 GHz center frequency and 42% bandwidth, is −54 dB, up to 8.9 GHz. By also using suitably placed resistors, spurious levels are now depressed to −67 dB up to 8.8 GHz, with only 0.03 dB extra pass-band loss.

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.

scholarly journals Design of UWB Filter with WLAN Notch

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Harish Kumar ◽  
MD. Upadhayay
Keyword(s):  
Circuit Simulation ◽  
Ground Plane ◽  
Stop Band ◽  
Simulation Software ◽  
Pass Band ◽  
Area Network ◽  
Band Pass Filter ◽  
Frequency Range ◽  
Pass Filter ◽  
Band Pass

UWB technology- (operating in broad frequency range of 3.1–10.6 GHz) based filter with WLAN notch has shown great achievement for high-speed wireless communications. To satisfy the UWB system requirements, a band pass filter with a broad pass band width, low insertion loss, and high stop-band suppression are needed. UWB filter with wireless local area network (WLAN) notch at 5.6 GHz and 3 dB fractional bandwidth of 109.5% using a microstrip structure is presented. Initially a two-transmission-pole UWB band pass filter in the frequency range 3.1–10.6 GHz is achieved by designing a parallel-coupled microstrip line with defective ground plane structure using GML 1000 substrate with specifications: dielectric constant 3.2 and thickness 0.762 mm at centre frequency 6.85 GHz. In this structure aλ/4 open-circuited stub is introduced to achieve the notch at 5.6 GHz to avoid the interference with WLAN frequency which lies in the desired UWB band. The design structure was simulated on electromagnetic circuit simulation software and fabricated by microwave integrated circuit technique. The measured VNA results show the close agreement with simulated results.

scholarly journals Miniature Bandpass Microwave Filter with Ultradeep Suppression in a Wide Stopband

2019 ◽  
pp. 758-764
Author(s):  
Maksim O. Savishnikov ◽  
Dmitry D. Dmitriev ◽  
Eduard D. Kabanov
Keyword(s):  
Stop Band ◽  
Microwave Filter ◽  
Center Frequency ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Electrodynamic Analysis ◽  
Band Pass ◽  
Conductor Strip

The paper presents the results of a study of the design of a miniature band-pass filter based on multi-conductor strip resonators. Using the software for electrodynamic analysis, a sixthorder band-pass filter on seven-conductor resonators was designed and manufactured. Designed filter is characterized by small size and deep repression of the stop band. The measured filter characteristics exceed the characteristics of known analogs. The measured width of the highfrequency stop band of 24 times the center frequency of the bandwidth at the level of suppression at least 160 dB

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.

Circular-shaped differential wideband band pass filter

2019 ◽  
Vol 12 (3) ◽  
pp. 193-197
Author(s):  
Dharmendra Kumar Jhariya ◽  
Akhilesh Mohan ◽  
Rahul Kaushik ◽  
Vishal Narain Saxena
Keyword(s):  
Close Agreement ◽  
Stop Band ◽  
Symmetry Plane ◽  
Pass Band ◽  
Band Pass Filter ◽  
Differential Mode ◽  
Common Mode ◽  
Pass Filter ◽  
Band Pass

AbstractThe design of a circular-shaped differential wideband band pass filter (BPF) is described. The proposed filter is compact and provides good common mode (CM) suppression. It consists of four ports with a circular-shaped differential mode (DM). The analysis of the filter has been carried out by bisecting it into identical two-port networks along the symmetry plane, resulting in a band stop or band pass response under CM or DM excitations, respectively. The length and width of the stubs can be tuned to obtain the desired pass band and stop band of the differential BPF. The proposed design is fabricated and measured. The results obtained using measurements are in close agreement with those obtained using simulations.

A highly selective UWB bandpass filter using stepped impedance stubs

2018 ◽  
Vol 10 (3) ◽  
pp. 301-307 ◽  
Author(s):  
Minjae Jung ◽  
Byung-Wook Min
Keyword(s):  
Return Loss ◽  
Bandpass Filter ◽  
Stop Band ◽  
Ultra Wideband ◽  
Pass Band ◽  
Band Pass Filter ◽  
The Novel ◽  
Pass Filter ◽  
Radial Stub ◽  
Band Pass

AbstractWe present a new ultra-wideband (UWB) band-pass filter (BPF) configuration with a stepped impedance short-circuited stub (SISS)-loaded triple-mode resonator (TMR) and stepped impedance radial stub (SIRS). The novel SISS-loaded TMR and SIRS improve the roll-off ratio at both ends. Even though this UWB BPF is based on a single resonator, the measured results show excellent in-band performance with a small insertion loss less than 0.6 dB and return loss greater than −16 dB. The proposed UWB BPF has sharp roll-off ratio of 96 and 43 dB/GHz, respectively, at the lower and upper edges of the pass-band, and a wide stop-band from 10.8 to 15.6 GHz with the rejection greater than 20 dB.

Compact multiple electromagnetic band gap (EBG) cells based ultra wide band (UWB) filter with improved stop-band characteristics

Circuit World ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Masood Molimoli Hajamohideen ◽  
Sreeja Balakrishanapillai Suseela
Keyword(s):  
Stop Band ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Pass Band ◽  
Band Pass Filter ◽  
Frequency Range ◽  
Pass Filter ◽  
Electromagnetic Band Gap ◽  
Content Type ◽  
Band Pass

Purpose The purpose of the study is – in Microwave filter design, the performances of passive components are deteriorated by parasitics at gigahertz (GHz) frequency range. A compact and multi-stack electromagnetic band gap (EBG) structure is proposed with improved stop band characteristics at GHz frequency range in this work. This paper proposes a new design for ultra wide band pass filter (resonator BPF) with periodically loaded one-dimensional EBG to achieve the harmonic suppression. This basic EBG structure is developed with combination of a signal strip and ground plane in the slotted section. The resonator BPF is loaded with one EBG, two EBG and three EBGs to improve the stop-band rejection. Design/methodology/approach The proposed filter is with multi-stack EBG cell for achieving good pass band and stop bands performance. Circuit model is analyzed in Section 2. Section 3 discuses band pass filter loaded with one EBG. In Sections 4 and 5, filter with two and three EBG loaded resonators are discussed, respectively. Section 6 is concluded with comparison of simulation and measured results. Findings The stop-band rejection is 20 dB, 40 dB and 50 dB, respectively, in the frequency range of 6 GHz to 20 GHz. The simulation analysis is carried out with advanced system design software. To validate the simulation results, proposed structure is fabricated, and results are found to be in good agreement. Originality/value This paper accounts for designing resonator BPF, which has slow wave pass band and stop band characteristics. Second and third harmonics are suppressed using multi-stack EBG. Various stacks with basic designs are proposed and improved results have been demonstrated which is open for future research.

scholarly journals Switchable Terahertz Band-Pass/Band-Stop Filter Enabled by Hybrid Vanadium Dioxide Metamaterial

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Ying Chen ◽  
Jianwei Cheng ◽  
Chaowu Liang
Keyword(s):  
Vanadium Dioxide ◽  
Surface Current ◽  
Center Frequency ◽  
Pass Band ◽  
Metallic State ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Stop Filter ◽  
Band Pass ◽  
Functional Components

To date, little research has been carried out on the integration of switchable and diversified functionalities into a single metamaterial in the terahertz (THz) range. Here, a hybrid vanadium dioxide (VO2) metamaterial was designed with switchable properties of band-pass filter and band-stop filter in the frequency range of 0.3–1.6 THz. Simulations demonstrated that under TE polarization, the proposed system acted as band-stop filter with the center frequency of 0.95 THz when VO2 is in the insulating state. Upon the transformation of VO2 into the metallic state, the proposed system behaved as a band-pass filter with a transmittance of >80%. The physical mechanism of the band-pass/band-stop conversion was examined by analyzing the surface current distribution of the designed device. The switchable characteristics of this structure can enable its wide application in tunable THz functional components such as amplitude modulators, polarization control, and intelligent switches.

scholarly journals Design of Dual-Band Dual-Mode Band-Pass Filter Utilizing 0° Feed Structure and Lumped Capacitors for WLAN/WiMAX Applications

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1697
Author(s):  
Ahmed A. Ibrahim ◽  
Wael A. E. Ali ◽  
Mahmoud A. Abdelghany
Keyword(s):  
High Selectivity ◽  
Stop Band ◽  
Dual Band ◽  
Pass Band ◽  
Area Network ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Region ◽  
Compact Size ◽  
Band Pass

Two dual-band second-order highly selective band pass filters operated at 3.5/5.5 GHz and 3.5/6 GHz for wireless local area network /worldwide interoperability for microwave access WLAN/WiMAX applications are introduced in this paper. The designed filters are inspired of utilizing two coupled open-loop resonators loaded with stub, spiral resonators and lumped capacitors. The filters are designed based on calculating the desired coupling matrix and the external quality factor. The first and the second filters are designed at the fundamental mode of 3.5 GHz then the first filter is loaded with two spiral resonators in the microstrip line to produce the desired band stop behaviour, which in turn achieves the second pass-band. However, the second band of the second filter is achieved by loading the stub with the lumped capacitors, which controls the second mode. The centre frequency of the second band is adjusted by varying the lumped capacitors values. The two designed filters have insertion loss less than 0.7 dB in the pass-band region, high selectivity with more than 4 transmission zeros and more than 20 dB attenuation level in the stop band region. The suggested filter has compact size and high selectivity with tunability behavior. The two filters are fabricated and measured to validate the simulated results.

Design of switchable microstrip low pass-band stop-band pass filter

2016 ◽  
Vol 59 (2) ◽  
pp. 257-260 ◽  
Author(s):  
Prashant Kumar Singh ◽  
Anjini Kumar Tiwary
Keyword(s):  
Stop Band ◽  
Pass Band ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Low Pass ◽  
Band Pass
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