Apparatus for mixing frequency
View Patent ↗A frequency mixing apparatus includes a local oscillator, a signal distributor, a first frequency mixer and a second frequency mixer and a combiner. The signal distributor divides a signal generated from the local oscillator into two signals having a phase difference and outputs the two signals. The first frequency mixer has a first input port through which one of the two signals outputted through the signal distributor is inputted and a second input port connected to an RF signal. The a second frequency mixer has a first input port through which one of the two signals outputted through the signal distributor and a second input port is connected to a termination signal. The combiner combines signals respectively outputted from the first and second frequency mixers.
1. A frequency mixing apparatus, comprising:
a local oscillator;
a signal distributor configured to divide a signal generated from the local oscillator into two signals having a phase difference and output the two signals;
a first frequency mixer configured to have a first input port through which one of the two signals outputted through the signal distributor is inputted and a second input port connected to an RF signal;
a second frequency mixer configured to have a first input port through which one of the two signals outputted through the signal distributor and a second input port is connected to a termination signal; and
a combiner configured to combine signals respectively outputted from the first and second frequency mixers;
wherein second harmonics respectively outputted from the first and second frequency mixers have a phase difference of 180 degrees.
2. The frequency mixing apparatus of claim 1 , wherein the signal distributor is a 90-degree hybrid for dividing the signal generated from the local oscillator into two signals having a phase difference of 90 degrees and outputting the two signals.
3. The frequency mixing apparatus of claim 1 , wherein the second input port of the second frequency mixer is connected to a 500 termination signal.
4. The frequency mixing apparatus of claim 1 , wherein the first and second frequency mixers are mixers having the same characteristic.
5. The frequency mixing apparatus of claim 1 , wherein the combiner removes the second harmonics respectively outputted from the first and second frequency mixers by offsetting the second harmonics from each other in a signal combining process.
6. The frequency mixing apparatus of claim 1 , wherein the combiner is a combiner having a zero-degree phase difference.
7. The frequency mixing apparatus of claim 1 , wherein the signal inputted through each of the first input ports of the first and second frequency mixers is a signal having a frequency band of 9.8 GHz, and the RF signal inputted through the second input port of the first frequency mixer is a signal having a frequency band of 29.6 to 30 GHz.