The Wave Concept in Electromagnetism and Circuits by Unknown

Author:Unknown
Language: eng
Format: epub
Publisher: John Wiley & Sons, Incorporated
Published: 2016-08-30T00:00:00+00:00

Due to the maximal transmission of the power around the resonance for the case of the thick FSS without the dielectric of Figure 3.25, the hole of the unitary cell of the FSS may be represented schematically by a capacitance C in parallel with an inductance L. The capacitance is due to the fringe effects of the rectangular cavity, modeling the metal waveguide of the intermediate region II. Since the majority of modes within the rectangular hole are evanescent, the fields at the interfaces Ω1 and Ω2, which come out of regions I and III, increase when the length of the hole t decreases. Consequently the capacitance C increases and the resonant frequency of the thick FSS reduces.

The power which is both transmitted and reflected in Figure 3.26 relates to the thick FSS structure with rectangular holes, filled with an insulator with a relative dielectric constant εr= 4 for different thickness values for the perforated metal sheet. The perforated metal sheet filled with dielectric material is sandwiched between the air layers. The resonant frequency of the resulting FSS structure diminishes when the thickness of the metal sheet t increases. Hence the possibility of broadening the precision control band of the resonant frequency is present when in the simultaneous presence of both this behavior and that shown in Figure 3.25.

Figure 3.26. Powers which are both transmitted and reflected according to the frequency of a thick FSS with an insulator in the holes with εr = 4 for different thickness values for the perforated metal sheet

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