44results about How to "Suppress harmonic interference" patented technology

An antenna system includes an antenna, a first frequency dividing circuit, a second frequency dividing circuit, and a plurality of matching circuits. The first frequency dividing circuit is coupled to the antenna. The matching circuits are coupled to the first frequency dividing circuit. The second frequency dividing circuit is coupled to the matching circuits. The matching circuits are configured to process different frequency signals, respectively.

The invention is directed to a communication device and an electronic device. The communication device includes an antenna, a frequency dividing circuit, and at least one variable impedance circuit. The frequency dividing circuit has a common port coupled to the antenna and at least one output port. The frequency dividing circuit is configured to divide a frequency range received from the common port into a plurality of frequency sub-ranges and output at least one of the frequency sub-ranges respectively at the at least one output port. Each variable impedance circuit is coupled between a corresponding one of the at least one output port of the frequency dividing circuit and a respective first reference voltage. Each variable impedance circuit provides a respective variable impedance value switched between different respective impedance values. The communication device is advantageous in that harmonic interference in the communication device can be effectively eliminated.

The invention relates to a power supply device with extremely low harmonic interference. The device is characterized in that: a filtering layer (1) which consists of four layers of integrally copper-laid printed circuit boards (PCB) is arranged on a metal tube shell (8); the bottom of the filtering layer (1) is provided with input and output electro-magnetic interference (EMI) filtering circuits (1b); the middle of the metal tube shell is provided with a shield layer (7) which consists of four layers of integrally copper-laid PCBs; a main control layer (9) is arranged below the metal tube shell and is provided with a pulse-width modulation (PWM) control circuit, a power switch tube alternating current loop, an output rectifier alternating current loop and the like; feedthru capacitors (3) are connected to the filtering layer and the main control layer; ground wires of the feedthru capacitors (3) are connected to the metal tube shell; and input and output leads enter or leave the metal tube shell through the feedthru capacitors. The device has the advantages that: outward electromagnetic radiation of a power supply module is reduced greatly and high anti-jamming capability is realized; output harmonic waves are extremely low and are about one fifth that of the same type of general direct current to direct current (DC / DC) power supply module; a harmonic interference signal in a full bandwidth range is lower than 20 mV; and the power supply device can be well applied to anti-electromagnetic environment equipment with high requirement on harmonic waves.

The invention provides a communication device and an electronic device. Wherein, the communication device includes: an antenna, a frequency division circuit and at least one variable impedance circuit. Wherein, the frequency division circuit has a common port, the common port is coupled to the antenna and at least one output port, and the frequency division circuit is used to divide the frequency range received from the common port into multiple frequency sub-ranges and divide the multiple frequency sub-ranges into At least one of the frequency sub-ranges is respectively output to the at least one output port; and each of the at least one variable impedance circuit is coupled to a corresponding output port and a first output port of the at least one output port of the frequency division circuit. A reference voltage, and each variable impedance circuit respectively provides a variable impedance value switched between different impedance values. The communication device provided by the invention can effectively suppress harmonic interference in the communication device.