where , 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 and , the other between the adaptors for and . 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.

Stefan Bilbao 2002-01-22