Search for answers or browse our Knowledge Base.
Guides  Models  Validation  Blog

Guides


 Evaluating EMF Compliance  Part 2: Using NearField Calculations to Determine Exclusion Zones
 Beyond Analytical Formulas: Accurate Coil Inductance Calculation with ANSOF
 Complete Workflow: Modeling, Feeding, and Tuning a 20m Band Dipole Antenna
 DIY Helix High Gain Directional Antenna: From Simulation to 3D Printing
 Evaluating EMF Compliance  Part 1: A Guide to FarField RF Exposure Assessments
 Design Guidelines for Skeleton Slot Antennas: A SimulationDriven Approach
 Simplified Modeling for Microstrip Antennas on Ungrounded Dielectric Substrates: Accuracy Meets Simplicity
 Fast Modeling of a Monopole Supported by a Broadcast Tower
 Linking LogPeriodic Antenna Elements Using Transmission Lines
 Wave Matching Coefficient: Defining the Practical NearFar Field Boundary
 ANSOF Mastery: Adding Elevated Radials Quickly
 Enhancing Antenna Design: Project Merging in ANSOF
 On the Modeling of Radio Masts
 RF Techniques: Implicit Modeling and Equivalent Circuits for Baluns
 ANSOF Antenna Simulation Best Practices: Checking and Correcting Model Errors


 ANSOF 9.50 Release: Streamlining Polarization, Geometry, and EMF Calculations
 ANSOF 9: Taking Antenna Design Further with New Feeder and Tuner Calculators
 ANSOF Antenna Simulation Software  Version 8.90 Release Notes
 ANSOF 8.70: Enhancing Your Antenna Design Journey
 Introducing ANSOF 8.50: Enhanced Antenna Design & Simulation Software
 Get Ready for the Next Level of Antenna Design: ANSOF 8.50 is Coming Soon!
 Explore the CuttingEdge World of ANSOF Antenna Simulation Software!
 Upgrade to ANSOF 8.20  Unleash Your Potential
 ANSOF 8: Elevating Antenna Simulation to the Next Level
 New Release: ANSOF 7.90
 ANSOF 7.80 is ready!
 New ANSOF User Guide
 New Release: ANSOF 7.50
 ANSOF 7.20 is ready!
 New Release :: ANSOF 7.10 ::
 ANSOF 7.0 is Here!
 New Release :: ANSOF 6.40 ::
 New Release :: ANSOF 6.20 ::
 Show All Articles (3) Collapse Articles




Models

 Download Examples
 Modeling a CenterFed Cylindrical Antenna with ANSOF
 YagiUda Array
 Monopole Over Real Ground
 Helix Antenna in Axial Mode
 Modeling a Circular Loop Antenna in ANSOF: A StepbyStep Guide
 A Transmission Line
 An RLC Circuit
 Explore 5 Antenna Models with Less Than 50 Segments in ANSOF Trial Version

 Modeling a Super JPole: A Look Inside a 5Element Collinear Antenna
 Simulating the Ingenious Multiband Omnidirectional Dipole Antenna Design
 The Loop on Ground (LoG): A Compact Receiving Antenna with Directional Capabilities
 Precision Simulations with ANSOF for Magnetic Loop Antennas
 Advantages of ANSOF for Simulating 433 MHz Spring Helical Antennas for ISM & LoRa Applications
 Radio Mast Above Wire Screen
 Square Loop Antenna
 Receiving Loop Antenna
 Monopole Above Earth Ground
 TopLoaded Short Monopole
 HalfWave Dipole
 Folded Dipole
 Dipole Antenna
 The 5in1 JPole Antenna Solution for Multiband Communications

 The LazyH Antenna: A 10Meter Band Design Guide
 Extended Double Zepp (EDZ): A Phased Array Solution for Directional Antenna Applications
 Transmission Line Feeding for Antennas: The FourSquare Array
 LogPeriodic Christmas Tree
 Enhancing VHF Performance: The Dual Reflector Moxon Antenna for 145 MHz
 Building a Compact HighPerformance UHF Array with ANSOF: A 4Element Biquad Design
 Building a Beam: Modeling a 5Element 2m Band Quad Array
 Broadside Dipole Array
 LogPeriodic Dipole Array
 Broadband Directional Antenna
 A Closer Look at the HF Skeleton Slot Antenna
 The 17m Band 2Element Delta Loop Beam: A Compact, HighGain Antenna for DX Enthusiasts
 Enhancing Satellite Links: The MoxonYagi Dual Band VHF/UHF Antenna


Validation


 Simple Dual Band Vertical Dipole for the 2m and 70cm Bands
 Linear Antenna Theory: Historical Approximations and Numerical Validation
 Validating Panel RBS Antenna with Dipole Radiators against IEC 62232
 Directivity of V Antennas
 Enhanced Methodology for Monopoles Above Radial Wire Ground Screens
 Dipole Gain and Radiation Resistance
 Convergence of the Dipole Input Impedance
 Validating Dipole Antenna Simulations: A Comparative Study with KingMiddleton

Overcoming 7 Limitations in Antenna Design: Introducing ANSOF’s Conformal Method of Moments
By addressing seven critical limitations encountered in the traditional Method of Moments (MoM), ANSOF Antenna Simulation Software revolutionizes antenna modeling and design. The image below visually summarizes the challenges ANSOF has overcome.
Traditional MoM codes suffer from various limitations and inaccuracies due to linear approximations to geometry and the use of the thinwire kernel. The primary limitations include:
 No Curved Wires: Straight segments yield poor results for curved antennas such as helices, loops, and spirals.
 Wire Spacing Limitation: Parallel wires must be separated by at least a quarter of the segment length, restricting its applicability when close parallel wires are required, such as in openwire transmission lines.
 Issues with Bent Wires: Lack of convergence occurs when wires are bent at right or acute angles, leading to inaccuracies in wire grids.
 Short Segment Constraint: The segment length must exceed 0.001 of a wavelength, preventing the modeling of nonradiating circuits in the quasielectrostatic regime.
 Thin Wire Requirement: Thick wires deviate from the thinwire approximation, which assumes current flows only along the wire axis rather than on its surface.
 Tapered Wire Issues: Nonphysical discontinuities arise from changes in radius between adjacent segments.
 Proximity to Lossy Ground Plane: Horizontal wires near monopoles above ground screens with elevated radial wires exhibit diverging input impedance and inaccurate antenna efficiency.
Utilizing a Conformal Method of Moments (CMoM) with an Exact Kernel, ANSOF overcomes these limitations, enabling accurate modeling and analysis of antennas with complex geometries. This includes highgain antennas with grid reflectors, broadcast towers with elevated radial wires close to the ground, thick dipoles, steppedradius cylindrical antennas, tapered dipoles, and curved antennas such as helices, spirals, and loops, as well as any design involving curved, short, and closely positioned wires.
By overcoming these limitations, ANSOF empowers engineers, researchers, and ham radio enthusiasts to design antennas with enhanced accuracy and reliability. The software not only improves the modeling and analysis of complex antenna geometries but also opens up new possibilities for antenna optimization and design across a wide range of applications.