... ∗∂∂∀===∗+∗∂∂==∂∂ Similarly we can write: .. 2 22 12 121 2 2( 1 * 1, 2 * 2) 2 22 2( 1*, 2* ) ( , , ) 12 2( 1*, 2* ) 0 int 12, 21 122 22 1, 2 12 fV VfffV V OVVf V V Fixed po conditionfVfVKVKffKKVVVξξξξξ ... 2 ξξ. Lets do the 1,ξ equation first. ..1 22 12 121 21( 1 * 1, 2 * 2) 1111( 1*, 2* ) ( , , ) 12 1( 1*, 2* ) 0 int 12, 21 122 110, 1 12 fV VfffV V OVVf V V Fixed po conditionfVfVKVKffVVVξξξξξ ... TAG2 (Perfix) TAGn (Perfix) TAGn+1 (no Perfix) TAGn+k (no Perfix) Radio Frequency Identification Fundamentals and Applications, Design Methods and Solutions 1 42 1 2 11* 22 *LetsVVVVξξ=−=−...