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we want a 20dB couping with 1dB ripple, so Cmax is -19 and Cmin is -21
what kind of itterations?, why they pick each time a different C_max?
C max is -19 dB which is 0.112202
C max and Cmin are given to us from the question
there are lots of combinations for C_1 and C_2 to match eq1. how do i test a combination to see that it fits?
what is the addional criteria for C1 and C2 to fit?
Thanks
It is stated that Cmax is -19dB so in the righthand side of the table, the numbers are given in such a way that we can obtain -19dB. When you use 0.035=C1, you are getting the closest number to -19dB. Normally we use 10^(-C(dB)/20) , you can see this calculation in the beginning of some questions. If we implement it in reverse way, its calculation is like the following:
log(C1) = log(0.1125) = -0.948847478
-0.948847478*20 = -18.9769496 dB which is close enough to -19dB. It must be the reason of chosing 0.035 to obtain 0.1125. The others are not as close as this.
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