What is a TEM / GTEM cell?

TEM and GTEM Cells are used in EMC testing to create controlled electromagnetic fields within a closed transmission line structure. A TEM cell supports true transverse electromagnetic mode propagation, providing a well-defined and uniform field between the center conductor and the ground plane. GTEM cells extend this concept by using a tapered geometry with internal absorbers, allowing operation over a wider frequency range and accommodating larger equipment under test while suppressing higher-order modes and reflections.

These cells are widely used for both radiated immunity and emissions testing, particularly in pre-compliance and research environments. Key performance parameters include frequency range, usable test volume, field uniformity, and maximum field strength. TEM cells typically operate from DC up to a few hundred megahertz, while GTEM cells can extend into the gigahertz range. Field uniformity within the test region is critical for ensuring consistent and repeatable measurements, and calibration procedures are used to establish the relationship between input power and field strength.

TEM/GTEM Cells are designed to provide efficient field generation with relatively low input power compared to free-space test methods. They are equipped with RF connectors, impedance-matched structures, and internal absorbers in the case of GTEM cells to minimize reflections and maintain stable operating conditions. These systems can be integrated with signal generators, power amplifiers, and measurement instruments to support automated testing. Their enclosed design also helps contain emissions, reducing interference with surrounding equipment.

TEM/GTEM Cells are widely used in EMC pre-compliance testing, product development, automotive electronics validation, aerospace systems testing, and academic research. They provide a compact and cost-effective alternative to large anechoic chambers for testing smaller devices. Their ability to generate controlled and uniform electromagnetic fields makes them a valuable tool for evaluating both emissions and immunity performance.

The Largest Database of TEM / GTEM Cells

EMC Directory lists TEM / GTEM Cells from the leading manufacturers. Use the parametric search tools to narrow down on TEM/GTEM Cells based on your requirements. Once you find products that meet your specification, view product details, download the datasheet, compare products and request quotations. Inquiries generated via everything RF are directed to the manufacturers, who get back to you with a quote or information.