Suitability of passive RC-network-based inductorless bridged-T as a bandpass NGD circuit

Circuit World ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sébastien Lalléchére ◽  
Jamel Nebhen ◽  
Yang Liu ◽  
George Chan ◽  
Glauco Fontgalland ◽  
...  
Keyword(s):  
Design Methodology ◽  
Group Delay ◽  
Center Frequency ◽  
Proof Of Concept ◽  
Content Type ◽  
Equivalent Impedance ◽  
Measurement Results ◽  
Passive Network ◽  
Modeling Theory ◽  
Good Agreement

Purpose The purpose of this paper is to study, a bridged-T topology with inductorless passive network used as a bandpass (BP) negative group delay (NGD) function. Design/methodology/approach The BP NGD topology under study is composed of an inductorless passive resistive capacitive network. The circuit analysis is elaborated from the equivalent impedance matrix. Then, the analytical model of the C-shunt bridged-T topology voltage transfer function is established. The BP NGD analysis of the considered topology is developed in function of the bridged-T parameters. The NGD properties and characterizations of the proposed topology are analytically expressed. Moreover, the relevance of the BP NGD theory is verified with the design and fabrication of surface mounted device components-based proof-of-concept (PoC). Findings From measurement results, the BP NGD network with −151 ns at the center frequency of 1 MHz over −6.6 dB attenuation is in very good agreement with the C-shunt bridged-T PoC. Originality/value This paper develops a mathematical modeling theory and measurement of a C-shunt bridged-T network circuit.

Compact dual-mode microstrip bandpass filter based on slotted square patch resonator

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Karthie S. ◽  
Zuvairiya Parveen J. ◽  
Yogeshwari D. ◽  
Venkadeshwari E.
Keyword(s):  
Bandpass Filter ◽  
Filter Design ◽  
Center Frequency ◽  
Dual Mode ◽  
Content Type ◽  
Transmission Zeros ◽  
Compact Size ◽  
Mode Response ◽  
Better Than ◽  
Good Agreement

Purpose The purpose of this paper is to present the design of a compact microstrip bandpass filter (BPF) in dual-mode configuration loaded with cross-loop and square ring slots on a square patch resonator for C-band applications. Design/methodology/approach In the proposed design, the dual-mode response for the filter is realized with two transmission zeros (TZs) by the insertion of a perturbation element at the diagonal corner of the square patch resonator with orthogonal feed lines. Such TZs at the edges of the passband result in better selectivity for the proposed BPF. Moreover, the cross-loop and square ring slots are etched on a square patch resonator to obtain a miniaturized BPF. Findings The proposed dual-mode microstrip filter fabricated in RT/duroid 6010 substrate using PCB technology has a measured minimum insertion loss of 1.8 dB and return loss better than 24.5 dB with a fractional bandwidth (FBW) of 6.9%. A compact size of 7.35 × 7.35 mm2 is achieved for the slotted patch resonator-based dual-mode BPF at the center frequency of 4.76 GHz. As compared with the conventional square patch resonator, a size reduction of 61% is achieved with the proposed slotted design. The feasibility of the filter design is confirmed by the good agreement between the measured and simulated responses. The performance of the proposed filter structure is compared with other dual-mode filter works. Originality/value In the proposed work, a compact dual-mode BPF is reported with slotted structures. The conventional square patch resonator is deployed with cross-loop and square ring slots to design a dual-mode filter with a square perturbation element at its diagonal corner. The proposed filter exhibits compact size and favorable performance compared to other dual-mode filter works reported in literature. The aforementioned design of the dual-mode BPF at 4.76 GHz is suitable for applications in the lower part of the C-band.

A Filtering Power Divider with Tunable Center Frequency and Wide Stopband

Frequenz ◽  
2019 ◽  
Vol 73 (9-10) ◽  
pp. 301-306
Author(s):  
Xuehan Hu ◽  
Feng Wei ◽  
Jiawen Hao ◽  
Xiaowei Shi
Keyword(s):  
Design Method ◽  
Power Divider ◽  
Center Frequency ◽  
Electrical Length ◽  
Transmission Zeros ◽  
Quarter Wavelength ◽  
Varactor Diodes ◽  
Measurement Results ◽  
Band Pass ◽  
Good Agreement

AbstractIn this paper, a tunable power divider (PD) with a good band-pass filtering response using quarter-wavelength stepped impedance resonators (SIRs) is presented. By appropriately adjusting the impedance and electrical length ratio of SIR, the proposed structure can achieve wide stopband performance. Meanwhile, four varactor diodes are loaded to the external resonators to achieve electrical reconfiguration. In addition, a pair of transmission zeros (TZs) can be generated by applying source and load coupling on each side of the passband, which can effectively improve passband selectivity and out-of-band rejection. In order to verify the feasibility of the proposed design method, a prototype circuit of the proposed filtering power divider (FPD) with tunable center frequency is simulated, fabricated and measured. A good agreement between the simulation and measurement results is observed.

A novel active balance assistive control strategy based on virtual stiffness model of XCoM

2019 ◽  
Vol 40 (1) ◽  
pp. 132-142
Author(s):  
Wei Guo ◽  
Shiyin Qiu ◽  
Fusheng Zha ◽  
Jing Deng ◽  
Xin Wang ◽  
...  
Keyword(s):  
Control Strategy ◽  
Design Methodology ◽  
Sagittal Plane ◽  
Center Of Mass ◽  
Proof Of Concept ◽  
Disturbing Force ◽  
Content Type ◽  
Exoskeleton Robot ◽  
Stiffness Model ◽  
Virtual Stiffness

PurposeThis paper aims to propose a novel balance-assistive control strategy for hip exoskeleton robot.Design/methodology/approachA hierarchical balance assistive controller based on the virtual stiffness model of extrapolated center of mass (XCoM) is proposed and tested by exoskeleton balance assistive control experiments.FindingsExperiment results show that the proposed controller can accelerate the swing foot chasing XCoM and enlarge the margin of stability.Originality/valueAs a proof of concept, this paper shows the potential for exoskeleton to actively assist human regain balance in sagittal plane when human suffers from a forward or backward disturbing force.

Study on Design and Experiment of SAW Device Based on MSC

2011 ◽  
Vol 135-136 ◽  
pp. 954-959
Author(s):  
Chang Bao Wen ◽  
Yong Feng Ju ◽  
Li Liu ◽  
Ya Fei Jiang ◽  
Chen Zhao ◽  
...  
Keyword(s):  
Modular Design ◽  
Center Frequency ◽  
Network Analyzer ◽  
Test Results ◽  
Design Environment ◽  
Actual Measurement ◽  
Measurement Results ◽  
Data Output ◽  
Output Module ◽  
Good Agreement

In the design process of surface acoustic wave (SAW) device based on multistrip coupler (MSC), the characteristics of interdigital transducer (IDT) and device can not been directly achieved, and the layout structure of device can not be observed and checked. To solve some problems, the design platform of SAW device based MSC was realized in the Matlab design environment using the modular design. The design platform of SAW device based MSC consists of layout simulation module, characteristics simulation module and data output module. By means of realizing a SAW device based MSC with center frequency at 51.293MHz, the comparison and analysis between the design results and the actual test results are presented. Experiments results confirm that the platform can correctly design the device layout. The device characteristics achieved by the design platform are in good agreement with the actual measurement results by the network analyzer.

Integrating AR services for the masses: geotagged POI transformation platform

2016 ◽  
Vol 7 (3) ◽  
pp. 254-265 ◽  
Author(s):  
Jakub Trojan
Keyword(s):  
Augmented Reality ◽  
Design Methodology ◽  
Location Based Services ◽  
Proof Of Concept ◽  
Content Type ◽  
The Subject ◽  
The Creation ◽  
The Masses ◽  
Practical Implications ◽  
Tourist Information

Purpose The purpose of this paper is to propose the platform for effective transformation of points of interests (POIs) into augmented reality (AR), specifically into the three major software tools – Junaio, Layar and Wikitude. The objective is to facilitate the creation of POIs for common users of these programs and, thus, encourage the general public to participate in the formation of a new concept of applications using AR and location-based services. Design/methodology/approach The subject of this study was analysis of methods used for POI dynamisation under the context of location-based services. This paper suggests methodology based on database format transformation. It is focused on the creation of platform for automated geotagged POI transformation into AR. Findings The research results in prototype of online platform which is capable to automatically transform geotagged POI to three major AR applications. It discusses also the model implementation of this platform in Czech national tourist authority. Research limitations/implications The paper presents a proof-of-concept of dynamisation and transformation of an unspecified number of POIs stored in a simple table database and their transformation into the AR. Practical implications Services of AR are brought for the masses to effectively dynamise tourist information. Social implications Results could make the process of multimedialising data (POIs) more suitable for masses. Originality/value This paper presents a proof-of-concept of dynamisation and transformation of an unspecified number of POIs stored in a simple table database and their transfer into the three major AR applications.

Dual-wideband bandpass filter with independently controllable center frequencies and wide stopband

2017 ◽  
Vol 10 (1) ◽  
pp. 93-99 ◽  
Author(s):  
Yang Xiong ◽  
Litian Wang ◽  
Doudou Pang ◽  
Wei Zhang ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Bandpass Filter ◽  
Experimental Results ◽  
The Other ◽  
Mode Analysis ◽  
Center Frequency ◽  
Analysis Method ◽  
Measurement Results ◽  
Mode Resonator ◽  
Good Agreement

In this paper, a dual-wideband bandpass filter (BPF) with independently controllable center frequencies (CFs) and wide stopband suppression is presented using a new quintuple-mode resonator (QMR). By applying the classical odd-/even-mode analysis method, the resonant characteristics of the new QMR have been analyzed. It shows that five modes can be excited, and two of them can be employed to form the lower passband, while the other three modes contribute to the higher passband. For verification, a dual-wideband BPF using the new QMR is designed, fabricated, and tested. Experimental results show that the CFs of the dual-wideband BPF centered at 2.96 GHz and 5.695 GHz with 3 dB fractional bandwidths of 27.7 and 23.4%, respectively. In addition, 20-dB suppression in upper-stopband ranges from 2.23 to 4.04f0, where f0 is the center frequency of the first passband. The measurement results are in good agreement with the prediction results.

RuleML‐based learning object interoperability on the Semantic Web

2008 ◽  
Vol 5 (1) ◽  
pp. 39-58 ◽  
Author(s):  
Yevgen Biletskiy ◽  
Harold Boley ◽  
Girish R. Ranganathan ◽  
Harold Boley
Keyword(s):  
Semantic Web ◽  
Design Methodology ◽  
Learning Objects ◽  
Rule Base ◽  
Markup Language ◽  
Proof Of Concept ◽  
Content Type ◽  
Heterogeneous Learning ◽  
Rule Set ◽  
Practical Implications

PurposeThe present paper aims to describe an approach for building the Semantic Web rules for interoperation between heterogeneous learning objects, namely course outlines from different universities, and one of the rule uses: identifying (in)compatibilities between course descriptions.Design/methodology/approachAs proof of concept, a rule set is implemented using the rule markup language (RuleML), a member of XML‐based languages. This representation in RuleML allows the rule base to be platform‐independent, flexibly extensible and executable.FindingsThe RuleML source representation is easily converted to other XML‐based languages (such as RDF, OWL and XMI) as well as incorporated into, and extracted from, existing XML‐based repositories (such as IEEE LOM and CanLOM) using XSL Transformations (XSLT).Practical implicationsThe RuleML facts and rules represented in the positional slotted language are used by the OO jDREW reasoning engine to detect and map between semantically equivalent components of course outlines as the key step in their interoperation. In particular, this will enable the precise delivery of learning objects (e.g. course outlines) from repositories to a specific learner's context.Originality/valueAlthough the particular scenario is discussed in the present paper, the proposed approach can be applied to other tasks related to enabling semantic interoperability.

Towards interoperable recordkeeping systems

2017 ◽  
Vol 27 (2) ◽  
pp. 125-148 ◽  
Author(s):  
Gregory Rolan
Keyword(s):  
Design Methodology ◽  
Conceptual Models ◽  
Design Science ◽  
Proof Of Concept ◽  
Content Type ◽  
Meta Model ◽  
Concept System ◽  
Reflective Design ◽  
Practical Implications ◽  
Model Approach

Purpose The purpose of this paper is to introduce an infrastructural approach to metadata modelling and a generalised meta-model for recordkeeping metadata. This meta-model is an attempt to support interoperability between disparate systems, and particularly, between sets of ostensibly incommensurate record documentation. Design/methodology/approach The investigation used a reflective design-science investigation comprising interviews adaptive literature review, creation of conceptual models and the design and instantiation of a proof-of-concept system. Findings The investigation confirms that recordkeeping interoperability between disparate ontologies is achievable through a meta-model approach. In particular, the meta-model carefully defines relationships between entities with specific semantics that enable the development of interoperable domain schemas. Practical implications A meta-model for recordkeeping metadata facilitates the development of recordkeeping systems that possess interoperability-by-design. Social implications Recordkeeping systems that conform to the meta-model can, therefore, transcend the immediate transactional context and support participatory recordkeeping in terms of a plurality of stakeholder world views and agency in records. Originality/value This paper is one of the few reporting design-science approaches to recordkeeping informatics and one that has used a meta-model approach for recordkeeping metadata design. In contrast to most empirically determined metadata schemas, the top-down design approach has produced a schema from a wide variety of ontological sources.

The estimation of the length constant of a long cooling fin by variational iteration method

2015 ◽  
Vol 25 (4) ◽  
pp. 887-891 ◽  
Author(s):  
Yan Zhang ◽  
Qiaoling Chen ◽  
Fujuan Liu ◽  
Ping Wang
Keyword(s):  
Nonlinear Equation ◽  
Nonlinear Equations ◽  
Iteration Method ◽  
Design Methodology ◽  
Variational Iteration Method ◽  
Engineering Problem ◽  
Content Type ◽  
Variational Iteration ◽  
Length Constant ◽  
Good Agreement

Purpose – The purpose of this paper is to validate the variational iteration method (VIM) is suitable for various nonlinear equations. Design/methodology/approach – The He’s VIM is applied to solve nonlinear equation which is derived from actual engineering problem. The result was compared with other method. Findings – The result obtained from VIM shows good agreement with Xu’s result which provide a solid evidence that VIM is convenient and effective for solving nonlinear equation in the engineering. Originality/value – The VIM can be extended to many academic and engineering fields for nonlinear equations solving.

Blockchain for business

2019 ◽  
Vol 20 (1) ◽  
pp. 17-21 ◽  
Author(s):  
Rohith P. George ◽  
Brad L. Peterson ◽  
Oliver Yaros ◽  
David L. Beam ◽  
Julian M. Dibbell ◽  
...  
Keyword(s):  
Financial Services ◽  
Design Methodology ◽  
Legal Issues ◽  
Use Cases ◽  
Proof Of Concept ◽  
Content Type ◽  
Wide Range ◽  
Practical Guidance ◽  
The Right ◽  
Practical Implications

Purpose To introduce blockchain in simple terms for business lawyers to be able to spot the right issues and ask the right questions. Design/methodology/approach This article provides an overview of blockchain, identifies two example use cases, and highlights some of the most pressing legal issues, including issues to address in on-chain programming, off-chain agreements and other issues when determining whether to implement a blockchain solution. Findings This article concludes that there has been a significant growth in investment and interest in blockchain. Numerous companies across different sectors have developed blockchain proof-of-concepts, with some heading towards production deployments. At this point, commercial blockchain is largely in the pilot or proof-of-concept stage across a wide range of use cases, with payments and supply chain being two of the most promising use cases. This article also identifies possible legal issues associated with blockchain. Practical implications Despite the growing interest in blockchain, it is still a novel topic to many business lawyers. It is very important that lawyers are able to identify the right issues and ask the right questions. Originality/value Practical guidance from experienced lawyers in the Technology Transactions and Financial Services Regulatory & Enforcement practices.

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