A device for measuring absorbent bodies that are spaced from each other on a continuous web comprises at least two microwave resonators configured to measure values of a shift of a resonance frequency and a spreading of a resonance frequency. The continuous web moves through the at least two microwave resonators and the at least two microwave resonators are positioned at an offset with respect to each other in the transverse and transport direction relative to a direction of transport of the continuous web in order to measure the entire width of the continuous web. At least one of a moisture and a density of the absorbent bodies is determined using the at least two microwave resonators to continuously determine the values of the shift of the resonance frequency and the spreading of the resonance frequency.

A device for measuring absorbent bodies that are spaced from each other on a continuous web comprises at least two microwave resonators configured to measure values of a shift of a resonance frequency and a spreading of a resonance frequency. The continuous web moves through the at least two microwave resonators and the at least two microwave resonators are positioned at an offset with respect to each other in the transverse and transport direction relative to a direction of transport of the continuous web in order to measure the entire width of the continuous web. At least one of a moisture and a density of the absorbent bodies is determined using the at least two microwave resonators to continuously determine the values of the shift of the resonance frequency and the spreading of the resonance frequency.

A test cable and a test method using the same are provided. The test cable includes a universal serial bus (USB) connector, a test terminal connector and a switch circuit. The USB connector is coupled to an electronic device and has a first pair of data pins and a second pair of data pins. The test terminal connector is coupled to a test fixture and has a pair of test data pins and a first control pin, and the test fixture is used for outputting a first control signal to the first control pin. The switch circuit is coupled to the first pair and second pair of data pins, the pair of test data pins and the first control pin, and couples the pair of test data pins to the first pair or second pair of data pins according to the first control signal.

A test cable and a test method using the same are provided. The test cable includes a universal serial bus (USB) connector, a test terminal connector and a switch circuit. The USB connector is coupled to an electronic device and has a first pair of data pins and a second pair of data pins. The test terminal connector is coupled to a test fixture and has a pair of test data pins and a first control pin, and the test fixture is used for outputting a first control signal to the first control pin. The switch circuit is coupled to the first pair and second pair of data pins, the pair of test data pins and the first control pin, and couples the pair of test data pins to the first pair or second pair of data pins according to the first control signal.

Embodiments if the present disclosure relate to a radio frequency (RF) adapter configured to mimic the load that an antenna element would see if it was otherwise radiating into free space. The adapter is configured to come in direct contact with an antenna ground plane so that modes of propagation may be established, and energy coupled from a radiating antenna element into the adapter. The adapter may be of any form that will support direct coupling and include a waveguide (WG) that is coupled to a planar slot radiating element of an antenna array. The WG can have a length, width, height, and a central longitudinal axis and an internal surface. A resistive load can be disposed along the central longitudinal axis of the WG and a reactive load can be disposed in the internal surface of the WG.

Embodiments if the present disclosure relate to a radio frequency (RF) adapter configured to mimic the load that an antenna element would see if it was otherwise radiating into free space. The adapter is configured to come in direct contact with an antenna ground plane so that modes of propagation may be established, and energy coupled from a radiating antenna element into the adapter. The adapter may be of any form that will support direct coupling and include a waveguide (WG) that is coupled to a planar slot radiating element of an antenna array. The WG can have a length, width, height, and a central longitudinal axis and an internal surface. A resistive load can be disposed along the central longitudinal axis of the WG and a reactive load can be disposed in the internal surface of the WG.

A device for measuring absorbent bodies that are spaced from each other on a continuous web comprises at least two microwave resonators configured to measure values of a shift of a resonance frequency and a spreading of a resonance frequency. The continuous web moves through the at least two microwave resonators and the at least two microwave resonators are positioned at an offset with respect to each other in the transverse and transport direction relative to a direction of transport of the continuous web in order to measure the entire width of the continuous web. At least one of a moisture and a density of the absorbent bodies is determined using the at least two microwave resonators to continuously determine the values of the shift of the resonance frequency and the spreading of the resonance frequency.

An over-the-air (OTA) wireless test system includes a container, a machine plate disposed on the container, a supporter disposed on the machine plate, a load board disposed on the supporter, a socket disposed on the load board, a device under test (DUT) installed in the socket, and a wave-guiding feature in the socket and the load board configured to pass and guide electromagnetic waves to and/or from an antenna structure of the DUT. The wave-guiding feature comprises a wave-guiding channel in the socket defined by a plurality of pogo pins surrounding the antenna structure of the DUT. The wave-guiding feature may further comprise a radiation passage in the load board defined by rows of via fence extending through an entire thickness of the load board.

A probe apparatus of a millimeter or submillimeter radio frequency band comprises transition layers having outermost layers on opposite surfaces of the probe apparatus. An internal transition cavity extends through the transition layers for guiding electromagnetic radiation within the probe apparatus. A probe layer disposed between the transition layers, the probe layer having a lateral transmission line for interacting with the electromagnetic radiation guided by the internal transmission cavity.

A probe apparatus of a millimeter or submillimeter radio frequency band comprises transition layers having outermost layers on opposite surfaces of the probe apparatus. An internal transition cavity extends through the transition layers for guiding electromagnetic radiation within the probe apparatus. A probe layer disposed between the transition layers, the probe layer having a lateral transmission line for interacting with the electromagnetic radiation guided by the internal transmission cavity.