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We briefly note that the same approach can be easily extended to the parallel-plate problem as well; beginning from system (3.67), we can introduce new variables
, and then multiply (3.67a) and (3.67b) by
and (3.67c) by . The new system is again symmetric hyperbolic. We do not show the network here, but we mention that we will require two gyrators; one linking the series adaptors with associated currents
, the other between the adaptors for
. One reflection-free port must be chosen for each gyrator; choosing both reflection-free ports at the adaptor with current
must be ruled out, but other configurations are acceptable.
The stability bound for the balanced (2+1)D network will be
which is superior to (3.71), the bound for the standard form.