The existing problems of the current interface are briefly introduced,including the interdiffusion,co-fire match and bond strength.

Based on the analysis of unconditional stability, a 2-stage LDMOS microwave power amplifier was successfully designed, P-1 was larger than 45 dBm, power gain was over 30 dB at 1580 ~ 1650 MHz, and PAE was over 30% , according to the load-pull result of the input and output impedance by the conjugate match.

Matching networks,which are changed into corresponding MOMENTUM components and used in schematic designing with well improvement design accuracy,are designed by the conjugate match method basing on the analysis of unconditional stability.

Through nodulation experiments and effectiveness analysis of nodule bacterium and different alfalfa varieties in the non-nitrogen liquid medium, compared with the control, 6 rhizobia and 5 alfalfa varieties with better symbiotic matching effects were screened and 15 combinations were developed.

The loss parameters in conformal perfectly matched layer(CPML) with different sizes and shapes are studied.

The analysis of transistor amplifier s characteristic in potential instability with bi conjugate match is discussed, and the S parameter of the transistor stabilized is obtained.