conjugate match of frequency multiplier

I am going to design a W-band frequency tripler using the package ADS, in order to get better efficiency, the source impedance should conjugate match the input impedance of varactor diode, and the load impedance shoule conjugate match the output impedance of varactor diode. But I dont't know how to conduct the conjugate match. When I optimized the source impedance(R1+j*X1) and load impedance(R2+j*X2), I even found that the power of output fundamental component is larger than that of input fundamental component(the source power is 20dBm), it's impossible in passive frequency multiplier.
Can anyone tell me why and give me some advice about the conjugate match of varactor diode in ADS simulation ? thank you!

http://www.zingg.org/Boulder/projects/nonlin_final.pdf