By Cruz F. R., Mateus G. R., Smith J. M.
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11). However, other sources and loads can be accommodated. The last element N may be a module that drives a load at the nominal impedance or one that drives no load at all. , a meter reading) to the driving signal, vo,N , the same ratio that is used in characterizing the module. In the former case, output conditions will be the same as during measurement so the measured gain of module N will apply. ) A load that is not at nominal impedance can be treated like the final module in the cascade. For example, a 10- resistive load connected to a 50- output cable provides an SWR of 5 at the cable output.
SIMPLIFICATION: UNILATERAL MODULES j j−1 Source j+1 Load Cable Fig. 4 17 Source and load connected. Since we use the variables voj T and vo,j +1 in defining the source (j − 1) and load (j + 1) module gains, respectively, the gain of cable j that connects them must be the ratio of vo,j +1 to voj T . 39) vo,j +1 . 40) Then the overall transfer function will be acas = vo2T vo3 vo4T vo5 vo,N+1,T vo,N+1,T ··· = . 41) We assume for now that the final module drives a matched load so vo,N+1,T = vo,N+1 and acas = vo,N+1 /vo1 , as desired.
28 CHAPTER 2 GAIN Cells B4–D10 (inclusive) are specified module and cable parameters. From these are derived the individual stage parameters in rows 14–20 and from those are computed the cumulative gains and phase shifts in rows 23–29. Cells D4–D9 give the SWRs at the outputs of each element. These are due to the modules, not to the interconnects, presuming that the latter are much better matched than the former. Thus cell D5 gives the input SWR for Module 2, even though it is labeled as the SWR at the output of the preceding interconnect.