GTEM Cell Chamber for RF Electromagnetic Field Radiation Immunity (EMS) and Emission Limit (EMI) Testing

GTEM (Gigahertz Transverse Electromagnetic) Cell Test Chamber represents an advanced electromagnetic compatibility test apparatus engineered for comprehensive EMC evaluation. This equipment employs an asymmetric rectangular waveguide structure to generate transverse electromagnetic waves within a controlled environment, simulating free-space propagation conditions for accurate electromagnetic field generation.

Utilizing GTEM technology for EMC performance assessment constitutes a contemporary measurement methodology within the electromagnetic compatibility domain. The chamber’s broadband operational capability (DC to microwave frequencies) enables both RF electromagnetic field radiation immunity testing (EMS per IEC 61000-4-3) and RF electromagnetic field radiation emission limit verification (EMI per CISPR standards).

Compared to conventional test configurations including shielded enclosures, anechoic chambers, and open-area test sites, the GTEM Test Chamber offers structural simplicity, cost efficiency, operational expediency, and automated test control capabilities. This configuration has received validation from accredited third-party testing laboratories.

Technical Specifications

• Frequency Range: DC to *GHz (dependent on power amplifier or EMI receiver configuration)
• Voltage Standing Wave Ratio: VSWR ≤ 1.5 (typical value)
• Characteristic Impedance: 50Ω
• Maximum Input Power: 1000W
• Electric Field Strength Range: 0-200V/m (dependent on input power)

GTEM Cell Test Chamber Structural Configuration

The electric field intensity at the transverse electromagnetic chamber’s central test volume is determined by:

E = √(Po × Rc) / d

Where:
E = Vertical electromagnetic field strength component
Po = RF power delivered to the transverse electromagnetic chamber
Rc = Characteristic impedance of the gigahertz transverse electromagnetic chamber
d = Vertical separation between the septum conductor and upper/lower ground planes

Maximum achievable field strength values can be calculated based on the dimensional parameters between the septum and ground planes within the transverse electromagnetic wave chamber.

LISUN Model Configuration Matrix