Abstract: A multi band-pass filter includes a first resonator and a second resonator. The first resonator has a first frequency pass band and a second frequency pass band. Moreover, the second resonator is electromagnetically coupled to another end of the first resonator. The second resonator has a third frequency pass band and a fourth frequency pass band, wherein the third frequency pass band overlaps (or is congruous with) the first frequency pass band and the fourth frequency pass band overlaps the second frequency pass band.

Abstract: A micro band-pass filter is disclosed. The micro band-pass filter includes a first resonator having a first inter-digital unit and a second inter-digital unit, which is connected to a first wavelength-impedance converter, on two ends thereof, and a second resonator having a third inter-digital unit and a fourth inter-digital, which is connected to a second wavelength-impedance converter unit on two ends thereof. The second inter-digital unit is adapted to face the third inter-digital unit when forming a first inter-digital coupling structure along with the third inter-digital unit, and the first inter-digital unit is adapted to face the fourth inter-digital unit when forming a second inter-digital coupling structure.

Abstract: Disclosed are a system restart circuit and system restart method thereof. The system restart circuit includes a capacitive element, a first end of which is coupled to a first voltage level; a restart switch for coupling a second end of the capacitive element to the first voltage level selectively; a first circuit for establishing a current path between a second voltage level and the capacitive element during a restart time, and setting a voltage level of an enabling signal of a system power supplying circuit according to the voltage level of the second end of the capacitive element; and a second circuit for controlling the first circuit to continually establish the current path during the restart time. The present invention can spontaneously restart the system when a restart signal is detected, so that the hardware restart can be accomplished with low cost.

Abstract: An electromagnetic interference eliminating apparatus includes a multi-stage filter that is composed of inductors, capacitors and resistors, and an active filter. The multi-stage filter receives an input signal and provides an eliminating band to eliminate the noise in the input signal. The active filter is connected with the multi-stage filter for buffering the input signal that has been eliminated and exactly outputting an output signal.

Abstract: A PCB layout structure for suppressing EMI and a method thereof is disclosed. The PCB layout structure for suppressing EMI includes a multi-layer PCB, a plurality of electric grids, and a plurality of conductive vias. The multi-layer PCB has a plurality of signal layers and a grounding layer. Each of the signal layers is disposed with a plurality of signal lines. The plurality of electric grids are disposed on each of the signal layers and cover the signal lines on each of the signal layers. The plurality of conductive vias are located between the layers of the multi-layer PCB to electrically connect the grounding layer with the electric grids on each of the signal layers. Thereby, electromagnetic waves of a specific wavelength are shielded by appropriately choosing the dimensions of the electric grids.

Abstract: An electromagnetic interference eliminating apparatus includes a multi-stage filter that is composed of inductors, capacitors and resistors, and an active filter. The multi-stage filter receives an input signal and provides an eliminating band to eliminate the noise in the input signal. The active filter is connected with the multi-stage filter for buffering the input signal that has been eliminated and exactly outputting an output signal.

Abstract: The invention provides a power switching apparatus used in a network equipment in order to switch power generated by the Ethernet and an D.C. power supply. The power switching apparatus comprises a first input port used to connect to a first power terminal; a second input port used to connect to a second power terminal; an output port used to output a voltage; a switching circuit connected to the first input port, the second input port and the output port, wherein the switching circuit cuts off the output voltage generated by the first power terminal and outputs the voltage generated by the second power terminal while the second power terminal is plugged into the second input port.

Abstract: Disclosed are a system restart circuit and system restart method thereof. The system restart circuit includes a capacitive element, a first end of which is coupled to a first voltage level; a restart switch for coupling a second end of the capacitive element to the first voltage level selectively; a first circuit for establishing a current path between a second voltage level and the capacitive element during a restart time, and setting a voltage level of an enabling signal of a system power supplying circuit according to the voltage level of the second end of the capacitive element; and a second circuit for controlling the first circuit to continually establish the current path during the restart time. The present invention can spontaneously restart the system when a restart signal is detected, so that the hardware restart can be accomplished with low cost.

Abstract: A receiver of a frequency modulation (FM) system includes a first dielectric substrate, a second dielectric substrate, a helix antenna and an FM module. The helix antenna is formed between the first dielectric substrate and the second dielectric substrate and has a first end and a second end opposite to the first end. Thereby, a central axis of the helix antenna is approximately parallel to a side of the first dielectric substrate. The FM module is formed on the first dielectric substrate and electronically connected to the first end of the helix antenna. Besides, the FM module is used for transforming high-frequency signals received by the helix antenna into intermediate-frequency signals.