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Manufacturing.

Model XEC24P3-30G

Rev B

Pin 1

Pin 4

Input Port

Coupled Port

Isolated Port

Direct Port

Figure 1

At Anaren, insertion loss is defined as the log of the input power divided by the sum of the power at the coupled and

direct ports:

Note: in this document, insertion loss is taken to be a positive number. In many places, insertion loss is written as a

negative number. Obviously, a mere sign change equates the two quantities.

)

dB

(

P

P

P

log

10

IL

)

DC

(

out

)

CPL

(

out

in

10























(2)

In terms of S-parameters, IL can be computed as follows:

)

(

log

10

2

41

2

21

10

dB

S

S

IL





















(3)

We notice that this insertion loss value includes the power lost because of return loss as well as power lost to the

isolated port.

thermal calculations. Therefore, we define a new insertion loss value solely to be used for thermal calculations: