In order to permit efficient use of the radio frequency (RF) spectrum, engineers and technicians responsible for the planning, design, development, installation and operation of wireless systems must have a methodology for achieving electromagnetic compatibility (EMC).
This 3-day course provides a methodology for using EMC analysis techniques and tools for plan¬ning, designing, installing and operating wireless systems that are free from EMI problems. Careful application of these techniques at appropriate stages in the wireless system life cycle will ensure EMC without either the wasteful ex¬pense of over-engineering or the uncertainties of under-engineering. This course discusses the basic EMI problems and describes the role and importance of analysis in achieving EMC. It introduces the student to the basic EMC analysis techniques.
The EMI interactions that can occur between a transmitter and a receiver are identified and analysis techniques and tools that may be used in the planning, design, development, installation and operation of wireless systems that are free of EMI are provided. The course is specifically directed toward EMI signals that are generated by potentially interfering transmitters, propagated and received via antennas and cause EMI in RF receivers. Mathematical models for the overall transmitter receiver EMI interactions and the EMI characteristics of transmitters, receivers, antennas, propagation and system performance are presented.
Who Should Attend
Students are assumed to have an engineering background. In this course mathematical concepts are presented only as an aid to understanding of the various physical phenomena. Several years of education for a Bachelor of Science or Bachelor of Engineering Degree or several years experience in the engineering community is desirable.
What You Will Learn:
- Awareness of EMI as a potentially severe problem area associated with wireless electronic equipment and systems
- Understanding of the electromagnetic interference (EMI) interactions between transmitters and receivers Analysis techniques that will identify, localize and define (EMI) problem areas before rather than after time, effort and dollars are wasted
- More timely and economical corrective measures
- Wireless Systems
- Types of Service
- System Design Considerations
- System Design Example
- Spectrum Management
- Transmitter and Receiver EMI Interactions
- Definition of EMC/EMI Terms and Units
- EMC Requirements for RF Systems: Sources of EMI, Modes of Coupling, Susceptible Equipments, Effects of EMI (Conventional Systems, Frequency-Hopping / Spread-Spectrum Systems)
- Achieving EMC
- RF System EMC
- Major EMC Considerations: Frequency Separation, Time Separation, Distance Separation, Directional Selectivity Probability Considerations, No EMI Permitted, An Average EMI Situation, Acceptable EMI Situations Multi-Level Design Process, Amplitude Considerations, Frequency Considerations (On-Tune Case, Off-Tune Case), Performance Considerations
- System Specific EMC Considerations: Fixed Systems, Mobile Systems, Cellular Systems, Portable Systems, Satellite Systems, Low Power Systems, Broadcast Systems, Sample Problems
- Transmitter Considerations for EMC Design: Fundamental Emission Characteristics(Fundamental Emission Amplitude, Fundamental Emission Frequency, Representation of Fundamental, Bandwidth, Modulation Envelope)
- Harmonic: Emission Characteristics (Harmonic Emission Amplitude, Harmonic Emission Frequency)
- Nonharmonic Emission Characteristics (Nonharmonic Emission Amplitude, Nonharmonic Emission Frequency)
- Transmitter Emission Noise
- Transmitter lntermodulation
- Receiver Considerations for EMC Design: Co-Channel Interference (Adjacent-Signal Interference, Out-of-Band Interference)
- Fundamental Susceptibility: Co-Channel Susceptibility Threshold, Co-Channel Interference Frequency
- Adjacent-Signal Susceptibility
- Receiver Selectivity
- Nonlinear Adjacent - Signal Effects: Adjacent - Signal Frequency limits, Desensitization Impact on Signal Amplitude, Intermodulation (Intermodulation Frequency, lntermodulation Amplitude)
- Cross Modulation: Summary of Cross-Modulation
- Out-of-Band Susceptibility Threshold: Spurious Response Frequency, Spurious Response Amplitude
- Receiver Performance
- Antenna Considerations for EMC Design: Classes of Antennas, Antenna EMC Considerations (Far-Field Radiation Representation, Intentional-Radiation Region, Unintentional-Radiation Region,Site Effects), Intentional-Radiation Region Characteristics, Design Frequency and Polarization (Nominal Gain and Effective Area, Nominal Gain and Bandwidth), Frequency Dependence, Polarization Dependence
- Unintentional - Radiation Region Characteristics: Design Frequency and Polarization, NonDesign Frequency and Polarization, Measured Patterns Determination of Applicable Antenna Regions
- Near-Field Characteristics: Transition Distance, Collimated Beam Approximation for Near-Field gain, Near-Field Gain Corrections Time-Dependent Considerations
- Propagation Modes: Characteristics of Free Space Propagation, Model for Field Strength Calculations, Plane Earth Model, Okumura Model, Egli Model, Complex Cosite / Coplatform Coupling, Model for Coupling Between Vertically Stacked Antennas, Method of Moments, Geometric Theory of Diffraction, Combined MOM and GTD
Operational Performance Considerations for EMC: Operational Performance Thresholds, , Operational Performance Measures, Voice Communication Systems Performance (Interference Effects on Human Listeners, Performance Scoring), Digital Communication System Performance, System Electromagnetic Effectiveness, EMI Performance of Frequency-Hopping/Spread-Spectrum Systems, Modulation Considerations for EMC, AM, FM, FSK, PSK, etc.
- Signal Format for EMC: Single Channel, Multiple Users, FDMA, TDMA, CDMA
- EMI Mitigation: Equipment Selection, Antenna Decoupling (Polarization, Relative Orientation (e.g. vertical stacking), Antenna Pattern vs. Antenna/Antenna Coupling, Adaptive Arrays)
- Frequency Management
- Frequency Distance Separation Requirements
- Filters for Transmitters/Receivers
- Frequency Hopping Systems: Segment Bands, Coordinated Segment Frequency Hopping Tracking-Filters, Transmitters/Receivers Time Management, Transmitter Receiver Time Sharing Interference Cancellation
- System Design Tradeoff: Transmitter Power vs. EMI, Transmitter Power vs. Range, Receiver Sensitivity vs. EMI, Receiver Sensitivity vs. Range, Transmitter Noise, Receiver Desensitization and Intermodulation, Channel Loading/Band Occupancy, Sample Problems
Tuition for this three course is $1740 per person at one of our scheduled public courses. Onsite pricing is available. Please call us at 410-956-8805 or send an email to ATI@ATIcourses.com.
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