Radar & RF Systems
EM theory, antenna design, RF circuits, radar systems/signal processing, electronic warfare, and system test/measurement.
280 topics · 0 with articles
Intern Engineer· 40
- 1/f Phase Noise Fundamentals
- Atmospheric Attenuation: O2, H2O, Rain Models
- Coherent vs. Non-Coherent Detection Theory
- Cosite Interference and Frequency Deconfliction
- Diffraction: Knife-Edge and Physical Optics
- Direct RF Sampling and Digital IF Architecture
- EM Simulation Tools: HFSS, CST, Sonnet
- Free-Space Path Loss: Friis Transmission Equation
- Gain Compression at P1dB
- Guided Waves: Coaxial Line Modes
- Homodyne (Zero-IF) Receiver Architecture
- Image Frequency and Image Rejection Ratio
- Impedance Transformation: Quarter-Wave Section
- Ionospheric Effects on HF Propagation
- Leesons Model for Oscillator Phase Noise
- Maxwell Equations: Integral and Differential Form
- Noise Figure: Friis Formula for Cascaded Stages
- Noise Temperature and Equivalent Noise Bandwidth
- Nonlinear Distortion: Harmonics and IMD
- Plane Wave Propagation in Free Space
- Power Flow: Poynting Vector Definition
- Propagation in Urban Environments: Ray Tracing
- Radiation Resistance and Antenna Efficiency
- Receiver Sensitivity Calculation
- Reflection Coefficient and VSWR Calculation
- Reflection and Transmission at Dielectric Boundary
- Refraction: Snell Law for EM Waves
- S-Parameters: S11, S21, S12, S22 Definition
- Shannon-Hartley Channel Capacity Theorem
- Signal Flow Graphs and Masons Rule
- Skin Depth in Conductors at High Frequency
- Spurious-Free Dynamic Range (SFDR)
- Standing Wave Ratio Measurement and Impact
- Superheterodyne Receiver Architecture
- Third-Order Intercept Point (IP3) Definition
- Transmission Line Theory: Voltage and Current Waves
- Troposcatter Link Budget Calculation
- Wave Polarization: Linear, Circular, Elliptical
- Waveguide Cutoff Frequency and Phase Velocity
- Waveguide Modes: TE10, TM11, TEM
Junior Engineer· 40
- Active Element Pattern in Array
- Adaptive Beamforming: LMS and SMI Algorithm
- Antenna Bandwidth: Q Factor and FBW
- Antenna Diversity: Selection, MRC, EGC
- Antenna Gain, Directivity, and Efficiency
- Antenna Matching: Network and Balun Design
- Antenna Measurement: Far-Field Chamber, Compact Range
- Antenna Polarimetry: Jones Matrix, Mueller Matrix
- Aperture Antenna: Effective Area and Gain
- Aperture Illumination Taper and Side-Lobe Level
- Array Factor and Pattern Multiplication Theorem
- Coaxial Feed vs. Microstrip Inset Feed
- Conformal Antenna Array for Missiles and Aircraft
- Electrically Small Antenna Matching Strategies
- Electronically Scanned Array (ESA) Architecture
- Half-Wave Dipole Radiation Pattern and Impedance
- Half-Wave Spaced Array: Grating Lobe Condition
- High-Gain Feed Systems for Satellite Ground Station
- Horn Antenna Design: Pyramidal and Conical
- MIMO Antenna: Spatial Multiplexing Capacity
- MVDR Beamformer and Spatial Filtering
- Massive MIMO for 5G and 6G
- Metamaterial Antenna: High-Impedance Surface
- Microstrip Patch Antenna: Basic Design Equations
- Monopole over Ground Plane Antenna
- Mutual Coupling in Array Elements
- Near-Field to Far-Field Transformation
- Null Steering for Interference Cancellation
- Optical Antenna and Nano-Antenna Concepts
- Parabolic Reflector Antenna: Focal Point Design
- Patch Antenna: TM10 Mode and Fringing Fields
- Phased Array Steering: Electronic Phase Shifter
- Radiation Pattern: Main Lobe, Side Lobes, Back Lobe
- Radome EM Transmission and Design
- Reconfigurable Intelligent Surface (RIS) Basics
- Reflectarray Antenna Design
- Steerable Array Control Algorithm
- Terahertz Antenna and Near-Field Imaging
- UWB Antenna: Planar Monopole, Vivaldi Notch
- Wideband Antenna: Log-Periodic, Spiral
Middle Engineer· 80
- 3D Radar: Height Finding Techniques
- Ambiguity Function: Range-Doppler Trade-off
- Antenna-Integrated Module (AiP) Design
- Bistatic Radar Geometry and Equations
- CFAR (Constant False Alarm Rate) Detection
- CW Radar: Zero-Range Limitation
- Cavity Filter for High-Power High-Q Applications
- Cell-Averaging CFAR (CA-CFAR)
- Chirp Signal and Linear Frequency Modulation (LFM)
- Coaxial Connectors: SMA, N, 2.92mm, 1.85mm
- Coherent Integration for Non-Fluctuating Target
- Compressed Sensing for Sparse Radar Imaging
- Coupled-Line Bandpass Filter Design
- DDS (Direct Digital Synthesizer) Architecture
- Dielectric Resonator Filter Design
- Digital Pre-Distortion (DPD) for PA Linearization
- Directional Coupler: Branchline, Rat-Race, Lange
- Doppler Frequency and Radial Velocity Measurement
- Envelope Tracking Power Supply for PA
- FMCW Radar Signal Processing Chain
- FMCW Radar: Triangle Waveform and IF Signal
- FMCW Range and Doppler Coupling
- Fractional-N PLL with Sigma-Delta Modulator
- Free-Space Propagation for Radar Link Budget
- GMTI (Ground Moving Target Indication)
- GaAs and GaN Switch Design
- GaAs pHEMT for Low-Noise RF Applications
- GaN HEMT for Radar PA (X-Band, Ka-Band)
- Ground Penetrating Radar (GPR) Signal Processing
- High-Power Amplifier (HPA) Design: Load Pull
- ISAR (Inverse SAR) Imaging
- Image Reject Mixer and Hartley Architecture
- L-Network, Pi-Network, T-Network Matching
- LC VCO Phase Noise and Tuning Range
- LNA Design with HEMT / pHEMT (GaAs, GaN)
- LNA Stability: Rollett K Factor and MSG
- Low Noise Amplifier (LNA): Noise Figure and Gain
- MEMS RF Switch Basics
- MMIC (Microwave Monolithic IC) Design Flow
- MTI (Moving Target Indication) Filter Design
- Microwave Mixer: Single and Double Balanced
- Mixer Conversion Loss and IP3
- OS-CFAR and VI-CFAR Variants
- One-Way vs. Two-Way Path Loss Comparison
- Over-the-Horizon Radar: Ionospheric Path
- PIN Diode Switch: Bias Circuit, Loss, Isolation
- PLL Frequency Synthesizer Architecture
- Passive Coherent Location (PCL)
- Polyphase Codes (Frank, P4) for Radar
- Pulse Compression: Matched Filter Gain
- Pulse Radar Parameters: PRF, PW, Duty Cycle
- RF Bandpass Filter: Chebyshev, Butterworth
- RF CMOS Amplifier Design and Challenges
- RF Circulator and Isolator (Ferrite-Based)
- RF MEMS Phase Shifter for Phased Array
- RF PCB Stack-Up: RO4003C, RO3010 Materials
- RF T/R (Transmit/Receive) Module Design
- RF Transmission Line: 50 Ohm and 75 Ohm Standards
- Radar Altimeter Design and Applications
- Radar Cross Section (RCS) Definition and Models
- Radar Range Equation: Derivation and Parameters
- Radar Tracker: Kalman, IMM, JPDA
- Radar Waveform Design: Agility and Diversity
- Random Phase Codes for LPI Radar
- Range Resolution Formula: c*tau/2
- Ring VCO for Wideband Applications
- SAR Focusing Algorithms: Range-Doppler, Omega-K
- SAR: Synthetic Aperture Radar Principles
- STAP Degrees of Freedom and Sample Support
- Sea Clutter and Land Clutter Models
- SiGe BiCMOS for Millimeter-Wave IC
- Side-Lobe Level of Compressed Pulse (Taylor, Hamming)
- Smith Chart: Impedance Matching Steps
- Solid-State Limiter for Receiver Protection
- Space-Time Adaptive Processing (STAP)
- Sub-THz and THz Circuit Design Challenges
- Swerling Target Models I, II, III, IV
- Voltage-Controlled Oscillator (VCO) Design
- Weather Clutter and Polarimetric Discrimination
- Wilkinson Power Divider and Combiner
Senior Engineer· 40
- AI/ML for Radar Classification in EW
- Anti-Radiation Missile (ARM) Homing Logic
- Chaff Corridor and Dipole RCS Models
- Channelized Receiver Architecture
- Cognitive EW with Reinforcement Learning
- Compressive Receiver for EW Applications
- Cooperative Jamming Strategies
- DECM: Digital Electronic Countermeasures
- DRFM False-Target Generation
- DRFM: Digital Radio Frequency Memory
- Deceptive Jamming: Range Gate Pull-Off (RGPO)
- Directed Energy Weapon (DEW) Concepts
- ECM: Noise Jamming Techniques
- ELINT: Emitter Identification and Library
- EW Effectiveness: J/S Calculation
- EW Integration with IADS Architecture
- EW Threat Library Design and Management
- Electronic Attack (EA) System Architecture
- Electronic Counter-Countermeasures (ECCM)
- Electronic Support Measures (ESM): Intercept Receiver
- Emitter Location by TDOA and AOA Methods
- Flare Countermeasure (IR and RF Combined)
- Frequency Hopping Spread Spectrum (FHSS)
- High-Power Microwave (HPM) Effects
- IFM (Instantaneous Frequency Measurement)
- LPI Radar Design: Low Probability of Intercept
- LPI Waveforms: FMCW, Phase Codes, Noise Radar
- Multi-Function RF System Design
- Next-Gen Cognitive and Adaptive EW
- Quantum Radar Feasibility Assessment
- RF Fingerprinting for Emitter Recognition
- Radar Warning Receiver (RWR) Architecture
- Repeater Jammer Design Principles
- SEAD (Suppression of Enemy Air Defenses)
- Signal Sorting and Pulse Deinterleaving
- Spot Jamming, Barrage Jamming, Sweep Jamming
- Terrain-Bounce and Stand-Off Jamming
- Towed Decoy and Active Decoy Design
- Velocity Gate Pull-Off (VGPO) Technique
- Wideband Intercept Receiver Architecture
Staff Engineer· 40
- ADC Selection for Radar: Sample Rate, ENOB, SFDR
- AESA System Architecture: T/R Module Level
- AI-Assisted Radar Resource Management
- Calibration: Amplitude, Phase, Temperature
- Clutter Suppression Budget and MTI Improvement
- Coherent System Timing and Phase Reference
- Counter-UAV Radar System Design
- DAC Selection for Digital Waveform Generation
- Digital Beamforming (DBF) Architecture
- Digital Twin for Radar System Modeling
- Dual-Function Radar-Communications (DFRC)
- Dynamic Range Budget: Full-Chain Analysis
- FPGA-Based Digital Back-End Architecture
- Frequency Management in Dense RF Environments
- Frequency Plan and IF Selection
- GaN T/R Module Integration and Assembly
- MOSA (Modular Open System Architecture)
- Multi-Domain Operations Radar Integration
- Multi-Function Radar Resource Scheduling
- Multi-Static Radar Network Architecture
- Next-Gen AESA with GaN Monolithic Tiles
- Noise Figure Budget for Receiver Front-End
- PA Module Integration (Spatial Combining)
- Phase Noise Impact on Radar Performance
- Radar Data Fusion with EO/IR Sensors
- Radar RF Safety (ICNIRP Guidelines)
- Radar Signature Management: Low Observable
- Radar Software Architecture Model-Based
- Radar System Cooling and Thermal Management
- Radar System Trade Studies: SWaP Analysis
- Receiver Protection: Limiter, Circulator, TR Switch
- STANAG 4607 GMTI Data Format
- SoC Integration for Radar (Xilinx RFSoC)
- Software-Defined Radar Platform Design
- Spectrum Sharing: Radar and 5G Coexistence
- Spurious Response and Image Rejection Budget
- System Link Budget: Transmitter to Receiver Chain
- Target Detection Range Calculation (Rmax)
- Technology Roadmap for Radar Programs
- Wideband RF Channelizer Design
Distinguished Engineer· 40
- Antenna Range Gain Measurement
- Calibration Lab Accreditation (ISO 17025)
- Compact Range and Near-Field Chamber
- Conducted Emission IEC 61000-3-2 Test
- DO-160 Section 20 RF Susceptibility
- DO-160 Section 21 RF Emission
- EFT/Burst Test: IEC 61000-4-4 Setup
- EMC Pre-Compliance: Near-Field Probe Set
- ESD Test: IEC 61000-4-2 Contact and Air
- ETSI EN 301 091 Short Range Radar Compliance
- ETSI EN 302 571 ITS Radar Standard
- FCC Part 15.249 / 15.515 Radar Device Rules
- IEEE 521 Radar Letter Band Standard
- IP3 and P1dB Measurement Setup
- ITU Radio Regulations for Radar Bands
- Image Rejection Ratio Measurement
- LISN (Line Impedance Stabilization Network)
- Load Pull System for PA Characterization
- MIL-STD-461 CE102, CS101, RE102, RS103
- MIL-STD-464 System EM Environment
- Noise Figure Analyzer (Y-Factor Method)
- Noise Source: Excess Noise Ratio (ENR)
- Phase Noise Analyzer Measurement Setup
- Phase Noise with Cross-Correlation Method
- Phased Array Calibration: Element-Level Test
- Power Sensor and Power Meter Calibration
- RCS Measurement Range Setup
- RF Anechoic Chamber Antenna Pattern Test
- Radar Performance Test: Range and Accuracy
- Radiated Emission CISPR 22 Class B Test
- SAR Measurement Procedure
- SFDR Measurement with Spectrum Analyzer
- Signal Generator: Frequency, Power, Modulation
- Spectrum Analyzer: Span, RBW, VBW Settings
- Spurious Response Measurement Procedure
- Surge Test: IEC 61000-4-5 Waveform
- VNA Calibration: SOLT, TRL, TOSM
- VNA S-Parameter Measurement Procedure
- VNA Time-Domain Reflectometry (TDR) Mode
- Wideband Oscilloscope for RF Envelope