Category - Traveling Wave

The Quadrifilar Helix antenna (QFH or QHA), with its unique design and circular polarization, ensures efficient NOAA satellite signal reception. This article explores the history, key characteristics, and practical modeling of QFH antennas using AN-SOF, providing valuable insights for RF engineers and enthusiasts.

Learn how to simulate axial-mode helical antennas using AN-SOF. This study analyzes LHCP gain, impedance, and axial ratio over a finite wire-grid ground plane from 75 to 95 MHz.

Learn the fundamentals of Yagi-Uda arrays with this introductory model. This simulation features a folded dipole driver with arced ends, illustrating how parasitic elements shape a highly directional 9.7 dBi beam and achieve a 15 dB Front-to-Back ratio. This baseline design provides the perfect foundation for mastering antenna feeding, tuning, and optimization using AN-SOF.

Explore the precision of explicit boom modeling in this 9-element LPDA study. Using AN-SOF, we analyze a 200-800 MHz log-periodic array, demonstrating how the 'active region' shifts with frequency to maintain stable gain and VSWR. Learn why modeling feed lines as physical wires provides a superior analysis of wideband antenna performance.

This article explores the design and analysis of log-periodic sawtooth arrays (LPSA) for HF communications. It covers their geometric principles, frequency-independent characteristics, and demonstrates how AN-SOF simulation software models these antennas, providing valuable insights into their performance and behavior.

Learn how stacking two V antennas can boost directivity. This article presents a practical Dual V Antenna design and explains how to scale it for any frequency. Includes simulation insights and a link to an online calculator.