We decided to use the two layer boards because it can save spaces. Also, we use the whole bottom layer as the ground layer to reduce the interferences. Receiving Part: Amplifier and Low-pass filter are in the receiving part of PCB board. The received signals will go through the low-pass filter first to remove some noises. Then the amplifier will amplify the signals. Amplified signals will be sent to be processed. figure9 schematic of receiving board figure10 PCB for receiving part There are 3 pins on the left. The first pin is connected to 5 volts voltage. The second pin is the input connected to the circulator. The last pin is connected to the ground. The pin on the right is the output. Switch Between 2.1 GHz and 2.4 GHz Our PCB boards can be used for both 2.1 GHz and 2.4 GHz SAW sensor drivers. The only difference is just we need to replace some of the components.
We decided to use the two layer boards because it can save spaces. Also, we use the whole bottom layer as the ground layer to reduce the interferences. Receiving Part: Amplifier and Low-pass filter are in the receiving part of PCB board. The received signals will go through the low-pass filter first to remove some noises. Then the amplifier will amplify the signals. Amplified signals will be sent to be processed. figure9 schematic of receiving board figure10 PCB for receiving part There are 3 pins on the left. The first pin is connected to 5 volts voltage. The second pin is the input connected to the circulator. The last pin is connected to the ground. The pin on the right is the output. Switch Between 2.1 GHz and 2.4 GHz Our PCB boards can be used for both 2.1 GHz and 2.4 GHz SAW sensor drivers. The only difference is just we need to replace some of the components.
project5.docx