Abstract: A low pass filter includes a signal transmission line, a first open stub, a second open stub, a first coupling line, and a second coupling line. The signal transmission line is connected between a first port and a second port, and operable to transmit RF signals from the first port to the second port. The signal transmission line defines a first side and a second side opposite to the first side. The first open stub and the second stub are disposed on the first side and perpendicularly connected to the signal transmission line. The second open stub and the first open stub co-define a T-shaped gap. The first coupling line is parallel to the signal transmission line and disposed in the T-shaped gap. The second coupling line is parallel to the signal transmission line and disposed on the second side of the signal transmission line.

Abstract: A low pass filter includes a signal transmission line, a first open stub, a second open stub, a first coupling line, and a second coupling line. The signal transmission line is connected between a first port and a second port, and operable to transmit RF signals from the first port to the second port. The signal transmission line defines a first side and a second side opposite to the first side. The first open stub and the second stub are disposed on the first side and perpendicularly connected to the signal transmission line. The second open stub and the first open stub co-define a T-shaped gap. The first coupling line is parallel to the signal transmission line and disposed in the T-shaped gap. The second coupling line is parallel to the signal transmission line and disposed on the second side of the signal transmission line.

Abstract: A wireless transceiver comprises an antenna, a switch, a first receiver amplifier, a second receiver amplifier, a transmitter, a receiver, and a signal processor. The switch connects to the antenna and the transmitter respectively. The second receiver amplifier connects to the first receiver amplifier via the receiver. The signal processor connects to the first receiver amplifier and the second receiver amplifier respectively and controls working modes of the first receiver amplifier and the second receiver amplifier.