Wireless communication system
A wireless communication system is disclosed. The present invention mainly includes a transceiver, a first filter unit, a second filter unit, and a first amplifying unit, wherein the first filter unit is a harmonic oscillation circuit having an inductive component and a capacitive component serially coupled to each other, and the harmonic oscillation circuit as well as the circuit of the second filter unit efficiently filter out a local oscillation frequency signal and intermediate frequency signal traveling along with a radio frequency signal, thereby preventing neighboring communication systems from electro-magnetic interference due to radiation of the local oscillation frequency signal and intermediate frequency signal into air via an antenna after being amplified by the first amplifying unit.
1. A wireless communication system, comprising:
a transceiver having a transmitting end and a receiving end;
a first filter unit coupled to the transmitting end for filtering a radio frequency signal sent out from the transceiver and generating a first processed signal;
a second filter unit coupled to the first filter unit for filtering the first processed signal and generating a second processed signal; and
a first amplifying unit coupled to the second filter unit for amplifying the second processed signal to generate a third processed signal,
wherein the first filter unit is a harmonic oscillation circuit that comprises an inductive component and a capacitive component, and the inductive component and the capacitive component are serially coupled, and
wherein one end of the inductive component is coupled with the transmitting end and an input end of the second filter unit, the other end of the inductive component is coupled with one end of the capacitive component, and the other end of the capacitive component is grounded.
2. The wireless communication system of claim 1 , wherein the second filter unit is a band pass filter.
3. The wireless communication system of claim 1 , wherein the first amplifying unit is a power amplifier.
4. The wireless communication system of claim 1 , wherein the transceiver is configured for performing a frequency mixing process on local oscillation frequency signals and intermediate frequency signals to generate a radio frequency signal and outputting the radio frequency signal via the transmitting end and receiving an external radio frequency signal via the receiving end.
5. The wireless communication system of claim 1 , further comprising:
a switch unit for switching between the transmitting end and the receiving end;
an antenna for radiating the third processed signal from the switch unit into a channel and receiving a radio frequency signal from the channel; and
a second amplifying unit for processing the radio frequency signal received by the antenna, and outputting a processed radio frequency signal to the receiving end of the transceiver.
6. The wireless communication system of claim 5 , wherein the second amplifying unit is a low noise power amplifier.