AD-22/B — VHF/UHF Log-Periodic Dipole Antenna

Overview

The AD-22/B is a log-periodic dipole array operating across the 225 to 512 MHz frequency range. Built with a rugged aluminum alloy boom and seven dipoles, it is coated with a UV-resistant polyurethane paint for extended durability. This directional antenna is engineered for stationary broadcast, EMC testing, radio monitoring, and jamming applications.

Technical Summary

• Frequency Range: 225 to 512 MHz (VHF/UHF)
• Gain: 7 dBi
• VSWR: Typically < 1.5:1
• Impedance: 50 ohms
• Maximum Power: 500 W CW
• Connector: N female
• Polarization: Horizontal and Vertical

Operational Use Cases

• Radio monitoring and signal intelligence gathering from stationary positions.
• Electronic warfare, specifically high-power stationary jamming operations.
• Electromagnetic compatibility (EMC) testing requiring broad VHF/UHF coverage.
• Directional broadcast applications within the 225 to 512 MHz band.

Deployment Environments

Primarily designed for fixed-site and stationary deployments. Its aluminum construction, irridite finish, and two-component UV-resistant polyurethane paint ensure long-term survivability in permanent outdoor installations.

Performance Metrics

The antenna delivers a standard gain of 7 dBi and maintains a typical VSWR of less than 1.5:1 across its entire operating band. It handles up to 500 watts of continuous wave (CW) power.

Setup & Portability

The antenna features an end-support bracket compatible with mast outer diameters ranging from 26 mm (1 inch) to 60 mm (2 inches). An alternative model, the AD-22/B-T, includes a canvas bag for transporting and storing the boom and dipole elements.

Compatibility

Integrates with standard 50-ohm RF systems via an N female connector and mounts directly to common 1-inch to 2-inch diameter cylindrical masts.

FAQs

• How does a log-periodic dipole array achieve directionality? It uses appropriately sized dipole elements spaced along a central boom to form a directional beam. This design concentrates radiated energy in a specific direction rather than radiating uniformly.
• How does linear polarization affect signal transmission? Polarization describes the physical orientation of the transmitted electromagnetic wave. Matching the polarization state between the transmitting and receiving antennas establishes the optimal path for signal transfer.
• What must be verified for mast installation? The antenna features an end support designed for stationary deployment on external structures. Verify that the intended mast has an outer diameter between 26 mm and 60 mm.
• Problems we solve: how do we narrow antenna choices? Balancing operating bands, coverage needs and mounting space can make antenna selection difficult. Share those constraints with Cyntony to compare candidate antennas and identify what needs manufacturer confirmation (Our process).
• Outcomes we deliver: what comes from working through the requirements? The practical outcome is a requirements-led set of product options to evaluate with Cyntony. Confirm performance, compatibility and any service scope for your configuration before selection (Our process).

Video Notes