The Model 5211 from ETS-Lindgren is a wireless interface test system, that can check cell phone transmit and receive functionality with or without direct cable connection to the RF or data ports. This CAI or common air interface, allows the operator to perform tests faster and simulate a real-world environment. The portable enclosure consists of a patented near field coupler that couples with the phone’s own antenna and has a flat response over the frequency range of 700 MHz to 2 GHz. To eliminate nulls and hot spots, each enclosure is lined with ETS-Lindgren RF absorber, which improves test repeatability. This enclosure has an isolation of more than 80 dB. This enclosure works with Mobile/Cellular Radio Test Sets.