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Guides


 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
 The Equivalent Circuit of a Balun
 ANSOF Antenna Simulation Best Practices: Checking and Correcting Model Errors


 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 ::
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Models

 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

 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
 Impedance of Cylindrical Antennas

Directivity of V Antennas
The V antenna is a traveling wave antenna where high directivity can be achieved when the length of each arm of the V is greater than the wavelength. However, the angle between the arms must be chosen so that the fields radiated by both arms constructively add in the forward direction. Several authors have investigated the optimum angle of the V antenna as a function of the length of its arms. For instance, refer to G. A. Thiele and E. P. Ekelman, Jr., “Design Formulas for Vee Dipoles,” IEEE Trans. Antennas Propagat., Vol. AP28, No. 4, pp. 588–590, July 1980.
Thiele and Ekelman have reported a formula for calculating the angle between the arms that maximizes the directivity of a symmetric V antenna, which depends on the length of the arm measured in wavelengths. This formula is a polynomial fit to the results of various simulations using the Method of Moments (MoM). A linear fit to maximum directivity as a function of arm length has also been reported and it is given by
where L/λ is the arm length in wavelengths.
Details of the segmentation and kernel of the integral equation used have not been provided, but the thinwire approximation was probably used. Despite these missing data, these formulas serve as a reference to compare with the results obtained from ANSOF.
Figure 1 shows the ANSOF model of a V antenna and the calculated radiation pattern for an arm length L/λ = 2 and an angle Θ = 67°. Figure 2 shows maximum directivity as a function of the arm length in wavelengths. We can see that the agreement is quite good. The values obtained from Eq. (1) are somewhat lower than those of ANSOF, as if the antenna arms were shorter. This displacement of the results obtained by the traditional method of moments with thinwire kernel with respect to the MoM with exact kernel is well known, so it is expected to be observed in these comparisons.