Abstract: A radio frequency (RF) weak magnetic field detection sensor includes a ferromagnetic core, a pickup coil disposed to surround the ferromagnetic core, a substrate that includes an opening, a core pad connected to the ferromagnetic core and a coil pad connected to the pickup coil, and an insulating tube interposed between the ferromagnetic core and the pickup coil. The insulating tube includes a bobbin around which the pickup coil is wound, and a core hole formed to pass through the bobbin and configured to accommodate the ferromagnetic core.

Abstract: An apparatus and method for transmitting and receiving magnetic field signals in a magnetic field communication system are provided. The apparatus includes a controller configured to generate a communication signal, matching units that are configured to receive the communication signal and that respectively correspond to different matching frequencies, and loop antennas that are connected to the matching units, respectively, and that are configured to convert communication signals according to the different matching frequencies into magnetic transmission signals in the form of magnetic field energy and to transmit the magnetic transmission signals.

Abstract: A goods supporting device is disclosed. The goods supporting device includes a body having a plate shape, and a support frame configured to have a shape corresponding to the body and support the body to stand the body while the support frame is combined with the body. Here, a folding part to be folded is formed to the support frame, and the support frame includes a fixing area and a folding area separated based on the folding part. The fixing area is fixed by the body with combined with the body and the folding area is folded while the fixing area is fixed.

Abstract: A goods supporting device is disclosed. The goods supporting device includes a body having a plate shape, and a support frame configured to have a shape corresponding to the body and support the body to stand the body while the support frame is combined with the body. Here, a folding part to be folded is formed to the support frame, and the support frame includes a fixing area and a folding area separated based on the folding part. The fixing area is fixed by the body with combined with the body and the folding area is folded while the fixing area is fixed.

Abstract: Device for adjusting a space between chips in a semiconductor chip tester, is disclosed, including a carrier plate mounted movable along a horizontal guide rail, a mounting plate fixed to the carrier plate, an elevating plate mounted on the mounting plate movable in up and down direction by a vertical LM (linear motion) guider, a cam shaft rotatably mounted on the elevating plate, the cam shaft having a plurality of cam grooves formed in a radial direction in an outer circumferential surface, a driving mechanism for rotating the cam shaft, and a plurality of pick-up members each fitted movable in a horizontal direction by a horizontal LM guider in a state a top of each of the pick-up members is inserted in one of the cam grooves.