This is accomplished using a patent-pending near field coupler in the enclosure that couples with the phone’s own antenna. The coupling coefficient has a flat response over the frequency range of 700 MHz – 2 GHz.
With this (CAI), or common air interface, the operator performs the test faster and simulates a real-world environment. In contrast, the direct connection method bypasses the antenna and adds up to several dB of loss to the measurement. The CAI method provides a shorter signal path and readily detects a faulty antenna. (A connector is provided for testing with a direct connection if desired.) To eliminate nulls and hot spots, each enclosure is lined with ETS-Lindgren RF absorber, which improves test repeatability. Compressible RF gasketing is used to seal the lid on closure. Nominal shielding effectiveness > 80 dB, although higher values are possible.

Consistent orientation of the phone in the enclosure is important for test repeatability. To help the operator position the phone correctly, a sliding clamp and alignment post are built into the bottom of the enclosure. The base is also marked with an illustration of a typical phone position. The enclosure includes one external Type-N connector, which links the antenna coupler to the test set; one Type-N connector feed through for traditional direct connection testing; and a 9-pin filtered D-sub connector for more advanced test procedures.

Features:

• >80 dB Typical RF Isolation
• Custom Configurations Available
• Flat Coupling Response over 700 MHz - 2 GHz
• On-The-Air Test TX, RX Functionality Without Direct Cable connection to Cell Phone Data Port
• Phone Placement Fixture Assures Test Repeatability
• Works with Mobile/Cellular Radio Test Sets: HP 8924