The MWI VHF/UHF Slab Testing Solution is a large-format NDT platform engineered for the deep-penetration characterization of thick industrial materials. Specifically designed for “slabs” up to 6 inches thick, this system operates in the critical 30 MHz to 3 GHz range. It is the definitive solution for measuring the volumetric insertion loss and bulk conductivity of heavy-duty aerospace absorbers, honeycomb cores, and structural foam.

Enclosed-Boundary Engineering

At VHF/UHF frequencies, controlling the electromagnetic environment is the primary challenge. This system utilizes a unique hybrid architecture:

• Enclosed Transmit Boundary: The signal is launched within a metal-bounded enclosure to ensure maximum energy is directed into the material.
• Open Receive Boundary: The receiving assembly is designed without a metal boundary to eliminate internal resonance and standing waves, ensuring a pure transmission (S21) measurement.
• Large-Scale Iris: A 30-inch square aperture allows for the evaluation of bulk material properties without the edge interference common in smaller test fixtures.

The MWI Proprietary Advantage

Accurately extracting conductivity (S/m) from a 6-inch thick slab at 30 MHz requires more than just a VNA. This system relies on MWI’s proprietary calibration and data reduction suite. Our software accounts for the complex enclosed-field physics to deliver a linear correlation between simulated and real-world results, allowing for precise conductivity extraction and loss mapping.

Key Technical Specifications

• Frequency Range: Broadband coverage from 30 MHz to 3 GHz.
• High Penetration Depth: Optimized for thick-format materials (up to 6 inches).
• Dual-Polarization Acquisition: Independently captures X and Y directed E-fields to identify volumetric anisotropy or directional conductivity in structural cores.
• Sensitivity: Capable of resolving insertion losses from 0.01 dB/inch to 3 dB/inch.

Operational Advantages

• Massive Inspection Area: Large-format probes (4ft x 4ft x 2ft) provide the stability and scale required for industrial environments.
• Real-Time QC: Synchronized with VNA sweep speeds for rapid volumetric assessment of full-scale production panels.
• Rugged & Reliable: Built for the production floor, providing repeatable data for the most demanding stealth and structural aerospace programs.

Primary Utility

The premier tool for characterizing low-frequency absorbers, heavy-duty honeycomb cores, and large-scale shielding materials where volumetric consistency is a mission-critical requirement.