Abstract: A bottom feed cavity aperture antenna is provided. The bottom feed cavity aperture antenna includes a patch and a ground structure. The patch feeds a signal to the bottom feed cavity aperture antenna. The ground structure includes a continuous wall, and a top end and a bottom end, wherein the continuous wall surrounds the patch, a thickness of the ground structure is formed between the top end and the bottom end, a patch height is formed between the patch and the bottom end, and a ratio of the patch height to the thickness is substantially lower than ½, and a magnetic field is formed at the top end, and magnetic resonance directions of the magnetic field are parallel to a first axis.

Abstract: A sequential rotated feeding circuit for sequential rotated feeding of a signal with a wavelength ?g is provided. The sequential rotated feeding circuit comprises a feed transformer, a resistance transforming unit, a first antenna transformer, a second antenna transformer, a third antenna transformer and a fourth antenna transformer. The feed transformer has a feed line width resistance Zin. The resistance transforming unit is connected to the feed transformer, the first antenna transformer, the second antenna transformer, the third antenna transformer and the fourth antenna transformer. The resistance transforming unit has a transforming line width resistance Zl.

Abstract: An aperture antenna for transmitting a circularly polarized signal is provided. The aperture antenna includes an antenna substrate, a feed conductor and an antenna ground layer. The feed conductor is microstrip-fed or coplanar-wave-guide-fed. The antenna ground layer has an aperture, the aperture has a feed portion, a signal turning point, a first edge and a second edge, the first edge connects the feed portion to the signal turning point in a first direction, and the second edge connects the feed portion to the signal turning point in a second direction, the first direction is opposite to the second direction. When the aperture antenna transmits the circularly polarized signal, a traveling wave travels on the first edge, and at least one standing wave is formed on the second edge.

Abstract: In a light emitting diode (LED) chess set, when a chess piece of the chess set is placed on a chessboard, a power supply element in the chessboard will supply power to an LED in the chess piece to emit light, so that the chess piece gives a light emitting effect. When a player removes a chess piece from a square of the chessboard for a next movement of the chess piece, a control element in the chessboard will identify an identification element of the chess piece through a sensing element on the square to determine the possible next movements of the chess piece on the chessboard and drive the LEDs in the corresponding squares of all suggested movements to emit light. The light-emitting square guides and suggests players to make the next movement of a chess piece and improve a beginner's memory on the rules of chess.

Abstract: A rotor. The rotor includes a case, a reinforcing part, a shaft and a connecting element. The reinforcing part is formed with the case and defines an opening. The shaft extends into the opening. The connecting element connects the case and the shaft, with the reinforcing part disposed inside.

Abstract: A motor comprises a base, a rotor, a stator, and a circuit board. The base includes a sleeve. The stator includes at least one fastener. The sleeve has an inclined outer surface. The fastener extends to the circuit board and abuts the inclined outer surface to fasten the circuit board. A fan comprises a base, a hub, a shaft, a circuit board. The base has a sleeve. The hub comprises a plurality of blades disposed outwardly thereof. The shaft connects to the sleeve and is disposed in the hub. The stator has at least one fastener. The sleeve has an inclined outer surface. The fastener extends to the circuit board and abuts against the inclined outer surface to fasten the circuit board.

Abstract: A motor mechanism includes a stator, a first bearing, a second bearing, a sleeve and a rotor. The stator has an axial hole. The first bearing and the second bearing are respectively disposed in the axial hole. The sleeve is disposed in the axial hole and between the first bearing and the second bearing. The rotor has a shaft disposed in the axial hole and passing through the first bearing, the sleeve and the second bearing.

Abstract: A rotor. The rotor includes a case, a reinforcing part, a shaft and a connecting element. The reinforcing part is formed with the case and defines an opening. The shaft extends into the opening. The connecting element connects the case and the shaft, with the reinforcing part disposed inside.