物理代写|电动力学代写electromagnetism代考|PHYC20014

2022年7月15日

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物理代写|电动力学代写electromagnetism代考|Dielectric short-circuited FSS rings

The insertion of two short-circuits and four short-circuits in variable angular positions offers more flexibility in the adjustment of the FSS resonance frequency with circular dielectric rings shown in Figure 3.5. Circular rings are printed on a thickness substrate of $0.51 \mathrm{~mm}$ and a dielectric constant of 3.4. The internal radius and the external radius of the dielectric rings are respectively $3.8 \mathrm{~mm}$ and $4.5 \mathrm{~mm}$. The dimensions of the unitary cell are $a=11.43 \mathrm{~mm}$ and $b=10.13 \mathrm{~mm}$.

Figure $3.6$ shows the reflection coefficient of the FSS in Figure $3.5$ when it is fed with a normally incident plane wave in both the $x$ and the $y$ polarizations, respectively. The interface is described as having a grid of $120 \times 120$ pixels and the iterative procedure is halted after 1,600 iterations.

For increased flexibility within the resonance frequency, two other shortcircuits are added in specific angular positions as in Figure 3.5(b). Figure $3.7$ shows the reflection coefficient according to the frequency for $\varphi=20^{\circ}, 40^{\circ}$, $30^{\circ}$ and $60^{\circ}$, when the FSS is illuminated by a normally incident plane wave in the $y$ polarization.

物理代写|电动力学代写electromagnetism代考|FSSs charged by lumped elements and active FSSs

Using FSSs charged with passive elements and active elements is another altcrnative way to achicve the FSS concept, with a morc variable sclcctivity. To check that the WCIP iterative method supports charged FSSs, it is applied to a circular FSS dielectric ring, which is charged by capacitors, inductances or PIN diodes.

Figure $3.8$ shows the reflection coefficient of this FSS, with a thickness substrate of $0.102 \mathrm{~mm}$ and a dielectric constant of 2.4. It has a resonance of nearly $13.9 \mathrm{GHz}$.

The circular FSS rings are now charged by capacitors and inductances, and corresponding reflection coefficients are shown in Figures 3.9(b) and (c), respectively.

The increase in capacitance decreases the resonance frequency in relation to an uncharged FSS. On the other hand, the increase in inductance also increases the resonance frequency of the FSS, charged with inductances, as Figure $3.9$ shows. Hence, a large frequency range, centered upon the resonance frequency of an uncharged FSS, may be detected.

电动力学代考

有限元方法代写

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MATLAB代写

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