By Topic

Electromagnetic Interference and Compatibility, 2003. INCEMIC 2003. 8th International Conference on

Date 18-19 Dec. 2003

Filter Results

Displaying Results 1 - 25 of 83
  • Achieving EMC compliance by design - case study of fixed remote station in corDECT WLL system

    Page(s): 167 - 172
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (509 KB)  

    Telecommunication has an important role in society enabling effective voice & data communication between people across the globe. EMC compliance is mandatory and vital for telecom products. This paper deals with the efforts put in during the design & development and EMC testing of such a telecom product - Wireless in Local Loop (WLL) system to comply to International standards like ETSI, IEC & CISPR and National standards like TEC. This paper also highlights the advantages of incorporating EMC design rules in early stage of design, due to flexibility in choosing of components like filters, shields and protective devices to achieve cost-effective solution and avoiding field modification. A case study of telecom product, viz., (FRS) Fixed Remote Station of Wireless Local Loop (WLL) subsystem, used in subscriber premises for voice telephony and Internet connectivity is taken up for elucidating EMI problems encountered during the EMC certification process and the measures taken to mitigate the same. The experience gained during this FRS EMC compliance certification of the corDECT system will substantially reduce the cycle time in future products with better design margin. Emission and susceptibility requirements from Standard Institutes to meet the Regulatory Authorities are also outlined. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Printed quadrifilar helix: development of a novel antenna for measurement of electromagnetic interference

    Page(s): 349 - 352
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (337 KB)  

    Potential for EMI measurement application of a quadrifilar helical antenna is investigated through computer simulated design and testing for a given set of specifications. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • EMC directive & CE marking

    Page(s): 415 - 422
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (518 KB)  

    This paper deals with basics of CE marking with special reference to EMC directive. It also makes an endeavour to highlight certain aspects of the new EMC directive under preparation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Generation of unsymmetric sum and difference patterns

    Page(s): 275 - 278
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (262 KB)  

    It is very common to generate sum and difference patterns from either discrete antennas or from arrays. In the first case, it is required to use a directional antenna and an omni directional antenna. Sum pattern is produced from the directional antenna and difference pattern is created by simultaneously exciting directional and omni-directional antennas. In the difference patterns so obtained a exists in the bore sight direction although it is very deep. Moreover, the difference slopes are not optimal in terms of their heights. In the present work, an attempt is made to design an array to produce unsymmetric sum and difference patterns. The design involves the proposal of a typical amplitude distribution, which generates unsymmetric sum patterns. These patterns are converted into difference patterns again unsymmetric by introducing an additional phase of 180° to one half of the array. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Passive techniques for compliance of single-phase rectifiers with IEC 1000-3-2 norms

    Page(s): 1 - 8
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (511 KB)  

    A single-phase rectifier is often a front-end power stage for many power electronic circuits. The single-phase rectifier with capacitor filter generates high harmonic currents in the ac line that is unacceptable by the IEC 1000-3-2 harmonic-current-limit specifications. Passive circuits can achieve requisite compliance at low cost, with simplicity and reliability. Various techniques of the passive input-current-shaping are reviewed in this paper. Their design for compliance is presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Analysis and measurements of crosstalk in printed circuit board due to RF and transient pulses

    Page(s): 257 - 260
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    This paper describes the EMC problems on the PCB caused by the crosstalk between adjacent traces on the board. Theoretical formulae for near and far end crosstalk (NEXT, FEXT) for three conductor line on printed circuit board for unequal impedances are presented. The line parameters self & mutual inductances and capacitances are evaluated for coupled lines using the even & odd-mode analysis. The NEXT, FEXT magnitudes are computed using MATLAB software and the results are compared with those of experiments as well as Ansoft-HFSS (High Frequency Structure Simulator) package. The effects of RF, switching speed of the input digital signal, transient pulses and different terminal impedances on NEXT/FEXT are analyzed. Optimum design criteria of PCB are discussed for the realistic simulation to achieve EMC. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • EMC considerations in communication system design - a design approach based case study

    Page(s): 177 - 180
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    EMC design is no longer considered as a separate tack in system design. It is a part of system design that should be addressed from the initial phase of design cycle. The EMC design needs better understanding of the system hardware, identification of sources of interference, isolation of sensitive electronic circuits and implementation of EMI control techniques to minimise interference. A system designed with the knowledge of EMC will always perform better and suitable for operation in any complex environment. A communication system design in addition needs to tackle adjacent channel interference (ACI), co-channel interference and other out of band interference. This paper describes the methodology to control EMI and the steps involved in qualifying a communication system for stringent MIL-STD 461 EMC standard. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Designing for electromagnetic compatibility in pulsed high power transmitters: a case study

    Page(s): 109 - 114
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (363 KB)  

    SAMEER has designed and developed a high power S band low noise transmitter for the Doppler weather radar being used by the Indian Meteorology Department at Shar, Sriharikota. The transmitter is capable of delivering 1.2 MW of RF output power. It packages a pulsed high voltage and current of 75 KV and 40 A respectively in the vicinity of low voltage CMOS and TTL logic based control and monitoring circuits. It also has low voltage circuitry floating at 80 KV DC in the vicinity of protective crowbar firing systems. The paper gives a brief case study of the system and the EMC plan followed to overcome the EMI problems faced during the development of the system. The EMI/EMC aspects and the grounding plan of the total system which has been implemented will be presented in detail in the paper. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Directional characteristics of dipole arrays for well tapered amplitude distributions

    Page(s): 279 - 284
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (298 KB)  

    Uniformly excited arrays result in high side lobe level and hence they are not popular. However they have an advantage of low cost with reference to number of sources required. The systems where the EMI problems are to be addressed, it is essential to design antenna systems along with their excitation distribution which reduce side lobe heights. For this purpose some distributions are proposed in this work and their over all characteristics are consolidated. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Impulse immunity test method for digital integrated circuits

    Page(s): 249 - 252
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    A methodology is presented to test susceptibility of digital ICs for impulsive phenomenon. This paper gives an explanation of the impulse immunity test strategy and the test methods developed. Some results will be discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Common-mode noise source and its passive cancellation in full-bridge resonant converter

    Page(s): 9 - 14
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (406 KB)  

    In this paper the results of systematic investigation into identification of dominant source of CM noise generation in a full bridge resonant converter are presented. It is shown that a small mismatch in an apparently symmetrical circuit can result in large CM injection. Mathematical analysis to predict the CM current injection is presented and is validated using SPICE simulation. For cancellation of dominant CM injection simple passive techniques are suggested. Experimental results on 18 kW LCC resonant magnet power supply for INDUS-2 are presented to demonstrate the effectiveness of proposed passive techniques. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Numerical differentiation based parameter measurement algorithms for sinusoidal signals in noises

    Page(s): 123 - 128
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (437 KB)  

    A novel algorithm for signal parameters such as frequency, amplitude and phase estimation in noises is proposed in this paper. The proposed algorithm is based on numerical differentiation and Lagrange interpolation and need 2 samples and computation process, one of which is used for frequency estimation in half cycle of the signal and another of which is used for amplitude and phase estimation in another half cycle. With an initial sample frequency of 512 × 50 Hz, the signal is sampled and the frequency of the signal with white Gaussian noises is estimated at an accuracy of 0.001% over a range of 1 Hz to 50 kHz. With another sample frequency based on the estimated frequency, the signal is once again sampled and the amplitude of the signal is estimated an accuracy of 0.002% over a range of 1 V to 200 V and the phase angle of the signal is estimated an accuracy of 0.002% over a range of 0 to 360. Simulation analysis is accomplished with a sinusoidal signal in Matlab software, and the results of the simulation are satisfactory. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Immunity measurements using strip transmission lines and family of TEM cells

    Page(s): 261 - 268
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (498 KB)  

    Immunity measurements (both commercial and military testing) using basic strip transmission lines system and TEM family of cells/enclosures are surveyed in this paper. Measurement requirements and choice of test fixtures/jigs available are explained in brief. Frequency ranges, field-generating capabilities, techniques involved are briefly discussed w.r.t. type of application areas. Operational difficulties in meeting test requirements are also discussed. Finally a comparison on device options versus performance objectives is brought out in this paper for three different requirements. Suggestions for various options/test configurations are indicated in light of recent revisions of standards on immunity testing requirements in EMI/EMC. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • EMI controlling in a compact systems of airborne vehicles - a case study

    Page(s): 181 - 184
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (307 KB)  

    Assuring hundred percent electromagnetic compatibility at one shot is not at all possible in compact systems of airborne vehicles. We have to take care of EMC measures right from the design stage of development to the final stage of development and also have to implement EMC fixes at various stages of development. In this paper the authors mainly pointed out and expressed about EMI problems solved by design, EMI problems arised and EMC measures taken at different stages of development, problems solved at different stages and also highlighted about the analysis carried out and EMI control sequences followed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • EMI mitigation techniques in a microcontroller based water purification system - a case study

    Page(s): 115 - 118
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (334 KB)  

    The paper discusses how solution for EMI problems in a microcontroller based water purification system (WPS) is obtained by applying EMI mitigation techniques such as filtering, cabling, isolation and surge suppression etc., to meet EMC requirements for "CE" mark. Suppression of conducted emission from the system, to comply with EN 55014-1, 1997, is explained with illustrations and experimental results. Enhancement of the system's immunity to high-energy surge, to comply with EN 55014-2, 1997, is also presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Some investigations on the admittance characteristics of I-slot in a rectangular waveguide

    Page(s): 285 - 290
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (281 KB)  

    Inclined slots in a narrow wall of a rectangular waveguide are analyzed by different researchers. However, it is difficult to accommodate a slot of resonant length in the narrow wall. In view of this an I-slot which can resonate without any practical constraints is investigated in the present paper. The results of investigations consist of data on slot admittance parameters, coupling and VSWR. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Wideband printed log-periodic balun

    Page(s): 301 - 304
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (214 KB)  

    A compact printed log-periodic balance to unbalance (balun) transformer capable of operating over an octave band is presented for tunable antennas used for calibration measurements (ANSI C63.5). The balun can achieve more than octave bandwidth (0.8 GHz to 2.4 GHz) impedance match (VSWR < 2) with a magnitude balance at the output ports of ± 0.5 dB and a phase balance of 180° ± 5°. Advanced microwave design systems package is used to optimize the balun performance over the wideband and the simulated results are compared with measured results. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High performance mobile shielded shelter for telemetry application in combat vehicles

    Page(s): 199 - 202
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (344 KB)  

    A high performance mobile shielded shelter was designed and developed by CVRDE, Ministry of Defence, (DRDO) Chennai for telemetry application in combat vehicles sub system health monitoring purpose. This paper dwells upon the basic shielding requirements of such shelters, design and construction aspects, utilities installed and shielding effectiveness tests carried out at LRDE EMI/EMC test facility. This shelter forms part of the project Vehicle Electronic Data Acquisition System (VEDAS) to simulate the Command and Control roles of combat vehicles which incidentally uses a number of communication sets in HF, VHF and UHF bands besides densely packed tank electronic sub system leading to interesting EMI/EMC challenges/solutions. The health data of all sub systems are displayed, analyzed and reported in the shelter for the convenience of decision-makers. The SE results achieved are reported in this paper, which are the best figures achieved so far in mobile shelters of double isolation construction techniques with MS as basic shielding material. The test results and photographic views of the shelters are included in this paper. The indigenous design efforts and details of fabrication work are also reported in this paper. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computation of radiated electromagnetic fields from a lightning return stroke

    Page(s): 129 - 132
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (272 KB)  

    This paper presents the computed electric fields produced by a lightning return stroke. It is observed that the rate of rise of lightning current does not influence the vertical component of electric field. The negative pre-pulse magnitude of the horizontal electric field increases with time derivative of the lightning current where as the initial negative peak of the horizontal electric field increases in direct proportion to the return stroke velocity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • IEC 60601-1-2,2001: new EMC requirements for medical equipment

    Page(s): 409 - 414
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    International Electrotechnical Commission (IEC) brought out comprehensive standard IEC 60601-1-2,1993 (first edition) to address EMC problems in medical equipment. Technological developments in medical equipment and changes in electromagnetic environment rendered first edition inadequate in addressing all issues concerning to electromagnetic compatibility (EMC). IEC 60601-1-2,2001 (second edition) was brought out to address several of such issues, which were not part of first edition. This paper intends to analyze two issues. Firstly, major changes from first edition and reasons for these changes. This helps in better understanding of requirements of second edition. Secondly, redesigning products from EMC perspective to achieve compliance to new standard. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Importance of quality AC power distribution and understanding of EMC standards IEC 61000-3-2, IEC 61000-3-3 and IEC 61000-3-11

    Page(s): 423 - 430
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    The aim of this technical paper is to bring out the importance of regulations on AC power distributions on AC power distribution and understanding of the international EMC standards IEC 61000-3-2 (1998) that deals with the limitation of harmonic currents injected into the public mains supply, IEC 61000-3-3 (1994) and IEC 61000-3-11 (2000) those deal with measure of the ability of the product to cause voltage fluctuations and lightning to flicker at frequencies which cause human discomfort. The paper discusses the cause and effects of power harmonics, voltage fluctuations and flicker, in the power distribution system. The paper explains how the switched-mode power conversion technology based power supplies can cause a variety of undesirable effects in the power distribution system. It also presents how the power quality of the AC mains deteriorate due to voltage fluctuations caused by phase-controlled AC input operated electrical devices. The sources of "flicker" and its effects on human safety are also highlighted. An overview of EMC standards, IEC 61000-3-2 and IEC 61000-3-3/IEC 61000-3-11 is presented in this paper. Finally, experimental results of a product evaluated for EMC compliance as per IEC 61000-3-2 and IEC 61000-3-3 are also presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of waveguide dimensions of feed guide on overall admittance characteristics of slot coupled inclined armed T-junction

    Page(s): 269 - 274
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (279 KB)  

    Slot radiators are popular because of their compactness. However, design of slot arrays for a given application is highly involved. In addition, design of slot arrays, which do not result in EMI either in radar or in communication, is much more complicated. It is well known that for the sake of radiation the slots in the narrow wall of standard rectangular waveguide are made to incline in order produce horizontally polarized radiated fields. However, the resonant slot length cannot be accommodated due to dimensional considerations of the waveguide. Hence the slots are extended into the broad wall to accommodate resonant length. These two aspects are: i) extra length in the broad wall, ii) inclination of the slot in the narrow wall, create EMI due to the presence of cross polarized field components. It is possible to suppress such undesirable field components to escape from the presence of EMI by connecting a T-arm so that slot couples power into the T-arm so that slot couples power into the T-arm instead of free space. The T-arm has to be carefully designed with appropriate orientation to meet the requirements of polarization. E and H plane junction are conventionally used and they are analyzed by several authors. However, to design planar arrays consisting of slot coupled waveguide junctions, there is a need to twist the T-arm by an appropriate angle. That means it results in a waveguide junction in which both slot and T-arm are inclined. In the present work, the waveguide junction, which is suitable for the design of planar structures, is considered and the data on the effects of waveguide dimensions on the overall admittance characteristics is presented. The overall admittance is numerically evaluated from the derived analytical expressions as a function of dimensions of feed waveguide. The change in waveguide dimensions for the feed waveguide has become necessary in order to make the overall structure resonate. An expression for the admittance is derived from the knowledge of self-reaction and discontinuity in modal current. The self-reactions in the feed and coupled guide are separately obtained from TE and TM mode considerations. In the evaluation of admittance the energy stored in the primary guide is also considered. The data on the variation of norma- lized conductance and susceptance as a function of frequency for different feed guide dimensions and different slot and coupled arm inclinations are presented in this work. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of an automated EMC test facility

    Page(s): 327 - 332
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (368 KB)  

    The automation in the EMC measurements is always preferred from the conventional manual measurements, due to the repeatability and accuracy of the test results. There is a regular change in the EMI/EMC standards, particularly in military standards with the advancement in the technologies in the test and measurement instrumentation and also the proliferation of sophisticated electronics in the equipment design. There is always a need to refurbish and upgrade the EMC test facilities to meet the new EMC test requirements. An effort has been made to refurbish the existing EMC test facility of MIL-STD 461C/462 to MIL-STD 461E requirements in LRDE. In this paper the design aspects to automate the test instrumentation has been discussed. The automated test facility not only controls the emission and susceptibility test instruments but also monitors the performance of the EUT during susceptibility tests. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Elimination of electrostatic field from the FRP containers - a case study

    Page(s): 185 - 186
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (417 KB)  

    The FRP container is prone to formation of static electricity during transportation, handling or any other similar process. The level of static charge may rise up to 25KV and a current of approximately equal to 60-70 amps. This level is more than enough to ignite the explosives like pyros and EEDS. Therefore it is essential to protect the objects in the container from the static field. In this paper the authors mainly pointed out about the process of reducing static electricity with the ground grid and also shown the practically measured values, before and after the laying of ground grid. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High speed data acquisition systems for ISRO's airborne and spaceborne radars

    Page(s): 29 - 36
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (547 KB) |  | HTML iconHTML  

    During 1990's, high speed data handling and control unit (DHCU) was developed for Indian Space Research Organisation's (ISRO) C-band airborne synthetic aperture radar (ASAR) at Space Applications Centre (SAC), ISRO, India. It has been extensively utilised to acquire high bandwidth radar signal during ASAR flights aboard Beechcraft-200 aircraft, conducted regularly since 1997. DHCU supports ASAR data acquisition, formatting and storage. It carries out high speed 6-bit I/Q digitisation (30.814 MHz sampling) of the complex baseband signal (25 MHz bandwidth) received from the ASAR receiver. The digitized data are multiplexed with other auxiliary data before being stored on a redundant array of independent disks (RAID) based recorder through high speed ECL parallel interface. Subsequently, since 2000 A.D., ISRO has embarked upon a very ambitious spaceborne SAR mission, called radar imaging satellite (RISAT). The onboard digital subsystem for this high resolution spaceborne SAR has to cater to data acquisition, control and timing, data compression, buffer storage and formatting requirements. The ultra-high speed data acquisition units of this spaceborne radar consist of dual chains of ultra-high speed 8-bit ECL A-to-D converters based I/Q digitisers. These units perform digitisation of the received complex radar echo signals and calibration signals at more than 200 MHz sampling rate and demultiplexing of ultra-high speed digitised signal into multiple channels. It also implements radar data compression, variable data rate formatting and high speed LVDS interface with satellite. In view of the high bandwidth signals and high sampling rates (∼ 200 MHz), signal integrity, EMI/EMC and thermal issues assume great importance and pose a great challenge in the PCB and package layout, design and fabrication. This paper describes the high speed design requirements and configuration details for the ultra-high speed data acquisition units of spaceborne SAR as well as for high speed acquisition unit of airborne SAR. It also addresses the signal integrity, EMI/EMC and thermal related issues for these systems. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.