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Guides
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- Evaluating EMF Compliance - Part 1: A Guide to Far-Field RF Exposure Assessments
- Design Guidelines for Skeleton Slot Antennas: A Simulation-Driven Approach
- Simplified Modeling for Microstrip Antennas on Ungrounded Dielectric Substrates: Accuracy Meets Simplicity
- Fast Modeling of a Monopole Supported by a Broadcast Tower
- Linking Log-Periodic Antenna Elements Using Transmission Lines
- Wave Matching Coefficient: Defining the Practical Near-Far Field Boundary
- AN-SOF Mastery: Adding Elevated Radials Quickly
- Enhancing Antenna Design: Project Merging in AN-SOF
- On the Modeling of Radio Masts
- The Equivalent Circuit of a Balun
- AN-SOF Antenna Simulation Best Practices: Checking and Correcting Model Errors
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- AN-SOF Antenna Simulation Software - Version 8.90 Release Notes
- AN-SOF 8.70: Enhancing Your Antenna Design Journey
- Introducing AN-SOF 8.50: Enhanced Antenna Design & Simulation Software
- Get Ready for the Next Level of Antenna Design: AN-SOF 8.50 is Coming Soon!
- Explore the Cutting-Edge World of AN-SOF Antenna Simulation Software!
- Upgrade to AN-SOF 8.20 - Unleash Your Potential
- AN-SOF 8: Elevating Antenna Simulation to the Next Level
- New Release: AN-SOF 7.90
- AN-SOF 7.80 is ready!
- New AN-SOF User Guide
- New Release: AN-SOF 7.50
- AN-SOF 7.20 is ready!
- New Release :: AN-SOF 7.10 ::
- AN-SOF 7.0 is Here!
- New Release :: AN-SOF 6.40 ::
- New Release :: AN-SOF 6.20 ::
- Show All Articles ( 1 ) Collapse Articles
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Models
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- Modeling a J-Fed 5-Element Collinear Antenna for the 2 m Band
- Simulating the Ingenious Multiband Omnidirectional Dipole Antenna Design
- The Loop on Ground (LoG): A Compact Receiving Antenna with Directional Capabilities
- Precision Simulations with AN-SOF for Magnetic Loop Antennas
- Advantages of AN-SOF 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
- Top-Loaded Short Monopole
- Half-Wave Dipole
- Folded Dipole
- Dipole Antenna
- The 5-in-1 J-Pole Antenna Solution for Multiband Communications
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- Extended Double Zepp (EDZ): A Phased Array Solution for Directional Antenna Applications
- Transmission Line Feeding for Antennas: The Four-Square Array
- Log-Periodic Christmas Tree
- Enhancing VHF Performance: The Dual Reflector Moxon Antenna for 145 MHz
- Biquad UHF Antenna Array
- 145 MHz 5-Element Array of Square Loops
- Broadside Dipole Array
- Log-Periodic Dipole Array
- Broadband Directional Antenna
- A Closer Look at the HF Skeleton Slot Antenna
- The 17m Band 2-Element Delta Loop Beam: A Compact, High-Gain Antenna for DX Enthusiasts
- Enhancing Satellite Links: The Moxon-Yagi Dual Band VHF/UHF Antenna
- Array of Snowflake Quads
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Validation
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- 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
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A center-fed cylindrical antenna is the simplest example that we can simulate. It consists of a straight wire with a source at its center and becomes a half-wave dipole when the frequency is such that the length of the antenna is half the wavelength. Follow the steps below to model this antenna.
Step 1 | Setup
Go to Tools > Preferences > in the main menu for selecting suitable units for frequencies and lengths. In this example, frequencies will be measured in MHz and lengths in mm. Then, go to the Setup tabsheet. In the Frequency panel choose Sweep and fill the Frequency Sweep box as shown in Fig. 1. Make sure None is selected in Environment panel > Ground Plane box and Discrete Sources is selected in the Excitation panel.
Step 2 | Draw
Right click on the workspace and choose Line from the displayed pop-up menu >. The Draw dialog box for the Line will be shown. Fill the Line and Attributes pages as shown in Figs. 2 and 3. A straight wire with 17 segments and 5 mm in radius will be drawn in the workspace. Right click on the wire and choose the Source/Load command from the pop-up menu. Follow the procedure described in Adding Sources > and put a voltage source in segment number 9 (at the wire center). The source voltage is 1 (0º) V. The center-fed cylindrical antenna in the workspace is shown in Fig. 4.
Step 3 | Run
Click on the Run Currents and Far-Field (F11) button on the toolbar. After the calculations are complete, right click on the wire and choose Plot Currents from the displayed pop-up menu and select the desired frequency. The current distribution along the wire will be plotted, Fig. 5. Follow the procedures described in Displaying Results > for obtaining other parameters of interest.
As an example, the current distribution in amplitude and phase, the input impedance vs. frequency, the gain, and E-field patterns at 100 MHz are shown in the following figures. Note that the antenna length is half a wavelength at 100 MHz, so the current distribution approaches a semi cycle of a sine function, as expected for a half-wave dipole.