Gain of an axially slotted cylinder covered with a chiral coating and embedded in a chiral medium

Abstract

The gain characteristics of an axially slotted cylinder coated with a chiral layer and placed in another chiral background have been investigated using numerical simulations. The effects of various types of chiral coatings and chiral backgrounds upon the gain pattern have been studied. It is shown that an increase in the chirality of the coating enhances the gain in the forward direction and reduces the gain in the backward direction for the fixed chirality of the background. It is also studied that, by increasing the chirality of the background medium, the gain in the backward direction also increases. It is further found that the chiral nihility coating makes the gain pattern nearly isotropic, and this gain is almost independent of the chirality of the background chiral medium.

An axially slotted cylinder with specific inhomogeneous coatings

“…For a homogeneous dielectric coating, it is expected that the minimum field from the slot is guided toward rear side of the cylinder, see, e.g. [17]. Therefore, for an axially slotted coated cylinder, the FD and BD gains are important.…”

“…For example, high gains are preferred in point-to-point communications. This gain of an axially slotted cylinder covered with an inhomogeneous coating can be found using [11, 15, 17, 18] and given below: …”

“…The effects of two different dielectric, magnetic, and metamaterial coatings upon the gain pattern have been considered in [15]. The radiation characteristics of a chiral-coated slotted cylinder has been studied by Mahmoud [16] and Awan [17]. Mahmoud has investigated the radiation properties of chiral-coated longitudinal and circumferential slots with the free space background.…”

“…The effects of various chiral and chiral nihility coatings and chiral background media upon the gain pattern of a chiral-coated axially slotted cylinder have been studied by Awan. Recently, Awan has extended the proposed theory in [17] to the bi-isotropic coatings and bi-isotropic background media in [18]. He studied that a strong bi-isotropic coating with the free space background significantly enhances the gain in the FD.…”

Effects of bi-isotropic coatings and bi-isotropic background media upon gain characteristics of an axially slotted cylinder

“…The radiation and gain properties of an axially slotted cylinder become more controllable if it is coated with some material and have been investigated by many authors [35–52]. Hurd [35] investigated the radiation properties of a dielectric-coated axially slotted cylinder and also made comparisons with experimental results.…”