This paper describes the definition of“return wave attenuation”and“reflect attenuation”,introduces theoretically the meaning of “return wave attenuation” on view point of power,points out the difference between “reflect attenuation” and “return wave attenuation” and demonstrates the test connection used as “return wave attenuation”measurement before being really “reflect attenuation” measurement.

This paper introduces how to avoid over-reach interference by using equipment with ATPC (automatic transmit power control) function, adjusting the diameter of dish antennas and increasing RF attenuator in designing the Beijing-Wuhan microwave project.

When the added amount of polycarbonsilane is 20 percent, the reflection loss is more than 6dB,and the frequency width is 2 GHz respectivly.

The laser beam method using the reflection attenuation of plane parallel crystal was proposed and its feasibility was figured out in detail.

The Lichtenecher formula is used to culculate the electromagnetic parameters of radar absorbing coatings which are respectively made up of some adhesive and various radar-absorbing ingredients,the reflection loss formula (RLF) applicable to the homogeneous radar absorbing coatings is deduced according to the electromagnetic theory.

The paper puts emphasis on via s influence on signal reflection loss, and tries to give the optimum size of the via with numerical analysis and simulation method.

The results show that the effect of these factors on the reflection loss are in the following order, from strong to weak, milling time, particle size and mass fraction of the absorber.