# self-impedance

## self-impedance

[¦self im¦pēd·əns] (electricity)

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(electricity)

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where [i.sub.j] (t) is the switching current of the jth port and [z.sub.qj] (t) is the inverse Laplace transformation of [Z.sub.qj] (s) which represents the impedance between the jth port and the qth port and [z.sub.pp] (t) is the self-impedance of the qth port and k is the number of the ports.

The self-impedance of the ground wire connected between two grounded towers, called the self-impedance per span, was noted with [Z.sub.w].

The ports impedance of antenna 1 could be calculated by the self-impedance and the mutual impedance:

[Z.sub.EE] and [Z.sub.ET] are the self-impedance matrix in [[OMEGA].sub.E] and the mutual-impedance matrix between [[OMEGA].sub.E] and [[OMEGA].sub.T], respectively.

Therefore, it makes sense to evaluate the self-impedance of spiral for determining the appropriate spirals to suppress the noise in frequency range of interest.

The inductive sensor transforms the secondary circuit impedance into the reflected impedance [DELTA][Z.sub.I] in the primary circuit, in series with the self-impedance [Z.sub.I,0] of the unloaded coil:

Self-impedance and coupling to other nets are computed and displayed, so designers are able to pinpoint performance issues in complex designs efficiently and intuitively.

[Z.sub.11] stands for the self-impedance of the single dipole, while Z12 represents the mutual impedance of the dipole and its image [10].

The number of columns and raws of the self-impedance matrix [Z.sub.s] and the mutual impedance matrix [Z.sub.m] is N by N.

That is called the driving point impedance, which consists of self-impedance, mutual impedance and the ratio of their current distributions.

Here we only evaluate the mutual impedances between the two inductors, while the self-impedances can be obtained in the similar way.

This impedance matrix defines the mutual and self-impedances among the ports and can be obtained analytically only for regularly-shaped patches such as rectangular, triangular and circular patches.

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