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Solid level meter application

I just take apart in mmWave event in Shenzhen. And I get so much information and  it is more than I think. Thanks again.

Actrully, I am very now in this field. And I am a embedded hardware and software engineer. But I didn't have enough knowledge in this field, especially the knowledge about how to design antenna. It is same very complicat. I have two needs now. 

1st Application: I want to design a better sensor to replace ultrasonic solid level meter. Get more accurate position and more intuitive surface of solid(like the top shape of coal in coal bunker).

2nd Application: If it is possible to detect if there is a person in toilet seat. And for economic consideration, if it is posible to detect many toilet seat. 

For my usage, it there is any paper or docs in your website can let me know more about it. I want to know more about how to design the antena and if there is any datasheet or application can teach me.

Thanks very much.