FANO BANDWIDTH LIMIT

For more information on the Fano Bandwidth Limit program, see Reference 2 in Appendix C. If you visit Appendix C, press BACK on your browser to return here.

Fano Bandwidth Limit                  Calculate the minimum theoretical VSWR across a band F1/F2                  given a series or parallel RC or RL load.                  Units:  MHz,ohms,nH, and pF                  Enter F1 and F2 (F1,F2) [<Enter>=Quit] ? _

Let's determine the best match possible, using a network with an infinite number of elements, for a FET over the range of 8-18 GHz. The FET is modelled as a series RC network with R=15 ohms and C=0.5 pF. Input "8000,18000" and press <Enter>.

Type "SRC" and press <Enter> once again.

                 Enter RC values (R,C)  ? _

Finally, enter the FET input values as "15,.5" and press <Enter>.

Here is the output calculation

                Min. VSWR across band = 1.269