Abstract: A radio frequency communication system and a noise isolation method applied to the radio frequency communication system are provided. The radio frequency communication system includes an antenna, an amplifier and a noise isolating unit. The amplifier is electrically connected to the antenna to amplify a common-mode signal transmitted by the antenna and outputs an amplified common-mode signal. The noise isolating unit is electrically connected to the amplifier to isolate the amplified common-mode signal. The noise isolating unit includes a first transformer and a second transformer. The noise isolating unit isolates the common-mode signal and transmits the differential-mode signal, which can effectively reduce the noise and improve a signal to noise ratio without affecting the original signal.

Abstract: A radio frequency communication system and a noise isolation method applied to the radio frequency communication system are provided. The radio frequency communication system includes an antenna, an amplifier and a noise isolating unit. The amplifier is electrically connected to the antenna to amplify a common-mode signal transmitted by the antenna and outputs an amplified common-mode signal. The noise isolating unit is electrically connected to the amplifier to isolate the amplified common-mode signal. The noise isolating unit includes a first transformer and a second transformer. The noise isolating unit isolates the common-mode signal and transmits the differential-mode signal, which can effectively reduce the noise and improve a signal to noise ratio without affecting the original signal.

Abstract: A differential antenna and associated control system applied to a digital television (TV). The control system includes a differential antenna receiving a broadcasting signal and generating a differential radio frequency (RF) signal including a positive signal and a negative signal; a control unit generating a selecting signal according to a selected channel; a switch circuit including a switch control circuit and a plurality of matching circuits. Each of the matching circuits optimizes part of the digital TV bandwidth, and the switch control circuit receives the selecting signal to control that an optimized positive signal is generated to the control unit after the positive signal passes through a first matching circuit of the matching circuits, and an optimized negative signal is generated to the control unit after the negative signal passes through a second matching circuit of the matching circuits.

Abstract: A wireless transmission device and a computer system using the same are provided. The wireless transmission device is adapted to a computer system having a first housing and a second housing, a display is disposed in the first housing, and a motherboard is disposed in the second housing. The wireless transmission device includes a first antenna and a signal processing module. The first antenna is disposed in the side edge of the first housing opposite to the second housing and the signal processing module is disposed in the second housing. The signal processing module is connected with the first antenna via a cable, and it also has a second antenna, so as to process a wireless signal transmitted by the first antenna and the second antenna.

Abstract: A differential antenna and associated control system applied to a digital television (TV). The control system includes a differential antenna receiving a broadcasting signal and generating a differential radio frequency (RF) signal including a positive signal and a negative signal; a control unit generating a selecting signal according to a selected channel; a switch circuit including a switch control circuit and a plurality of matching circuits. Each of the matching circuits optimizes part of the digital TV bandwidth, and the switch control circuit receives the selecting signal to control that an optimized positive signal is generated to the control unit after the positive signal passes through a first matching circuit of the matching circuits, and an optimized negative signal is generated to the control unit after the negative signal passes through a second matching circuit of the matching circuits.

Abstract: A wireless transmission device and a computer system using the same are provided. The wireless transmission device is adapted to a computer system having a first housing and a second housing, a display is disposed in the first housing, and a motherboard is disposed in the second housing. The wireless transmission device includes a first antenna and a signal processing module. The first antenna is disposed in the side edge of the first housing opposite to the second housing and the signal processing module is disposed in the second housing. The signal processing module is connected with the first antenna via a cable, and it also has a second antenna, so as to process a wireless signal transmitted by the first antenna and the second antenna.