At IMS 2026 in Boston this week, ANTENNEX B.V. is demonstrating a new measurement capability for The Wireless Connector® reverberation chamber that captures error vector magnitude (EVM), adjacent channel leakage ratio (ACLR), non-linear distortion, and total radiated power (TRP) in a single measurement. This is the first example of EVM measurements performed inside a reverberation chamber where line-of-sight and alignment are not needed. The demonstration is aimed at mobile device manufacturers performing over-the-air testing as part of high-volume production quality control.
EVM is the gating test for 3GPP compliance: a device whose EVM exceeds the specified threshold cannot operate on the network, and it is also the parameter that many phone manufacturers measure on every unit they ship as part of in-line calibration and quality control. Until now, performing EVM measurements inside a reverberation chamber has been constrained by multi-path effects that classical de-embedding methods could not fully resolve.
Antennex’s approach handles those multi-path contributions by exploiting a precise characterization of the chamber during its measurement, removing inter-symbol interference from the measured signal. The IMS demonstration will show analog EVM with ACLR, non-linear distortion and TRP plotted as a function of input power, all derived from the same measurement. An upgraded software version supporting constellation diagrams and digital EVM is planned for delivery before the end of 2026.
“Reverberation chambers have always been the right tool for TRP because of its nature to integrate fields quickly without needing a line-of-sight setup. I’m very excited that we can now use those same benefits for EVM measurements” said Teun van den Biggelaar, CTO of ANTENNEX. “Our unique and proprietary algorithms de-embeds the multi-path components to extract EVM, ACLR, and TRP from a single measurement. This is all independent of the device’s location, alignment, and beamforming direction.”
The capability targets high-volume production of mobile handsets and communication terminals, among other applications. Tighter TRP measurement uncertainty allows manufacturers to operate closer to legal transmit-power limits without risking non-compliance, improving range and user experience. Combining EVM and TRP in a single reverberation chamber measurement reduces production test footprint and cycle time, complementing existing anechoic-chamber-based conformance workflows.
