Abstract: An all-pass filtering module of a common mode noise suppressing device includes first and second differential transmission circuits coupled to a reference node. Each of the first and second differential transmission circuits has an input terminal and an output terminal, and includes: first and second capacitive elements coupled in series between the input terminal and the output terminal; a first inductor coupled between the input terminal and the output terminal; and a third capacitive element and a second inductor coupled in series between the reference node and a common node between the first and second capacitive elements.

Abstract: The present invention is related to an electromagnetic noise filter device and an equivalent filter circuit thereof. The filter device comprises a substrate, a transmission line and a ground plane having slotted ground structure. The transmission line is configured on the top surface of the substrate, and the grounding plane is configured on the bottom surface of the substrate. At least one pair of impedance elements are configured within the slotted ground structure. The transmission line can be electromagnetic coupled to the slotted ground structure and the impedance elements so as to form an equivalent filter circuit. Thereby, the electromagnetic noises on at least one specific frequency may be absorbed by the impedance elements of the filter device so as to avoid the electromagnetic reflection induced by the electromagnetic noise and interfering the signal transmitted on the transmission line.

Abstract: The present invention is related to an electromagnetic noise filter device and an equivalent filter circuit thereof. The filter device comprises a substrate, a transmission line and a ground plane having slotted ground structure. The transmission line is configured on the top surface of the substrate, and the grounding plane is configured on the bottom surface of the substrate. At least one pair of impedance elements are configured within the slotted ground structure. The transmission line can be electromagnetic coupled to the slotted ground structure and the impedance elements so as to form an equivalent filter circuit. Thereby, the electromagnetic noises on at least one specific frequency may be absorbed by the impedance elements of the filter device so as to avoid the electromagnetic reflection induced by the electromagnetic noise and interfering the signal transmitted on the transmission line.

Abstract: A common mode noise reduction circuit includes at least one first input end, at least one second input end, at least one first output end, and at least one second output end. The circuit is further provided with at least one resistor, at least one inductor, and at least one capacitor, symmetrically disposed within the circuit loop defined by the four ends. Common mode noise, after entering the circuit, is transformed into heat by the resistance of the circuit such that the common mode noise is suppressed. Differential mode signals, on the contrary, after entering the circuit, can pass through the circuit with minimum loss.

Abstract: An all-pass filtering module of a common mode noise suppressing device includes first and second differential transmission circuits coupled to a reference node. Each of the first and second differential transmission circuits has an input terminal and an output terminal, and includes: first and second capacitive elements coupled in series between the input terminal and the output terminal; a first inductor coupled between the input terminal and the output terminal; and a third capacitive element and a second inductor coupled in series between the reference node and a common node between the first and second capacitive elements.

Abstract: A common mode noise reduction circuit includes at least one first input end, at least one second input end, at least one first output end, and at least one second output end. The circuit is further provided with at least one resistor, at least one inductor, and at least one capacitor, symmetrically disposed within the circuit loop defined by the four ends. Common mode noise, after entering the circuit, is transformed into heat by the resistance of the circuit such that the common mode noise is suppressed. Differential mode signals, on the contrary, after entering the circuit, can pass through the circuit with minimum loss.

Abstract: The present invention is related to a filtering device with slotted ground structure, comprising a first substrate, a second substrate and a pair of differential signal lines, in which a ground plane having slotted ground structure is provided between the first substrate and the second substrate. Each of the two differential signal lines is symmetric to each other and comprises a first line segment being horizontally provided on the top surface of the first substrate and a second line segment being horizontally provided on the bottom surface of the second substrate, respectively. The first line segment is connected to the second line segment through a vertically disposed conductive via. Thereby, a common-mode noise within a specific frequency band may be suppressed effectively, so as to avoid interference a differential-mode signal transmitted on the differential signal lines, due to the slotted ground structure etched on the ground plane.

Abstract: An exemplary embodiment of the present disclosure illustrates a signal transmission cell having a first through third conductors, a capacitor and an inductor. The first and third conductors form a first transmission circuit, and the second and the third conductors form a second transmission circuit. Signals which are respectively conveyed on the first transmission circuit and the second transmission circuit have the same magnitude, but have the opposite phases to each other, so as to form a pair of differential transmission lines. A first end of the inductor is electrically connected to the third conductor, and a second end of the inductor is electrically connected to a ground voltage. A first end of the capacitor is electrically connected to the first end of the inductor, and a second end of the capacitor is electrically connected to the second end the inductor.