Abstract: A system is provided for measuring a power radiated pattern of an incident radio frequency (RF) signal indicating spatial distribution characteristics of a device under test (DUT). The system includes multiple antenna elements arranged in an array, where the antenna elements include antennas and diodes coupled to the antennas, respectively. Each antenna has a radar cross-section (RCS) that is too small for the antenna elements to operate in a reflect mode. Each diode is zero biased, such that the diodes receive the incident RF signal through the antennas to which the diodes are respectively coupled, and rectify the incident RF signal to DC voltages that are proportional to power of the incident RF signal, enabling the antenna elements to operate in a detect mode.

Abstract: A convey chain (100) includes a plurality of link units (10) pivotly connected to one another. Each link unit includes a chain link (11), a connect link (12) and a carrier assembly (18). The connect link pivotly connects with the chain link, and includes a pair of side plates (121) and a transverse plate (123). The transverse plate transversely connects the pair of side plates. The carrier assembly is configured for carrying workpieces, and is upwardly mounted on the transverse plate.