Abstract: A signal splitter includes a low-pass filter circuit for permitting a low-frequency component of an incoming signal in an incoming telephone line coupled to a first connecting port to pass therethrough to a second connecting port, and a coupling circuit including a capacitor coupled between a first terminal of the first connecting port and a second terminal of the second connecting port, and a coupling transformer having a primary winding that interconnects the first terminal of the first connecting port and a first input end of the low-pass filter circuit, and a secondary winding that interconnects the second terminal of the second connecting port and a second output end of the low-pass filter circuit.

Abstract: A multiplexer circuit complies with Multimedia over Coax Alliance (MoCA) specifications and is adapted to be disposed between an input end and an output end. The multiplexer circuit includes a first adapter and a second adapter. The first adapter includes a first high pass filter and a first low pass filter connected in series to the first high pass filter. The second adapter is connected in parallel to the first adapter, and includes a second low pass filter and a second high pass filter connected in series to the second low pass filter. The first high pass filter and the second low pass filter are adapted to be disposed closer to the input end compared to the first low pass filter and the second high pass filter.

Abstract: A signal splitter includes a common mode choke circuit that includes a first choke coil having two input nodes coupled to an incoming telephone line, and two output nodes coupled respectively to two first input nodes of a first filter inductor of a first filter circuit, and a second choke coil having two input nodes coupled respectively to two second output nodes of a second filter inductor of a third filter circuit, and two output nodes coupled to a telephony instrument. A second filter circuit includes a first capacitor coupled between two first output nodes of the first filter inductor that are coupled respectively to two second input nodes of the second filter inductor. The third filter circuit further includes a second capacitor coupled between the second output nodes of the second filter inductor.

Abstract: A signal splitter includes a low-pass filter circuit for permitting a low-frequency component of an incoming signal in an incoming telephone line coupled to a first connecting port to pass therethrough to a second connecting port, and a coupling circuit including a capacitor coupled between a first terminal of the first connecting port and a second terminal of the second connecting port, and a coupling transformer having a primary winding that interconnects the first terminal of the first connecting port and a first input end of the low-pass filter circuit, and a secondary winding that interconnects the second terminal of the second connecting port and a second output end of the low-pass filter circuit.

Abstract: A SAW device includes: a SAW chip having a piezoelectric substrate and transmitting and receiving transducers; a circuit board formed with conductive inner contacts, each of which is connected electrically to a respective one of the transmitting and receiving transducers; a first adhesive-confining curb interconnecting the circuit board and the transmitting and receiving transducers and cooperating with the circuit board and the SAW chip to define an enclosed cavity thereamong; a second adhesive-confining curb surrounding the first adhesive-confining curb to define a sealing space therebetween; an adhesive body filling the sealing space; and a molding compound covering the SAW chip and connected sealingly to the second adhesive-confining curb.