The expression for K is as Equation (4) [ 21 ]: (4) K = 1 − | S 11 | 2 − | S 22 | 2 + | S 11 S 22 − S 12 S 21 | 2 | S 12 | | S 21 | It can be seen that an increasing trend for K is presented with the rising temperature.
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The expression for K is as Equation (4) [ 21 ]: (4) K = 1 − | S 11 | 2 − | S 22 | 2 + | S 11 S 22 − S 12 S 21 | 2 | S 12 | | S 21 | It can be seen that an increasing trend for K is presented with the rising temperature.