Radiation from an infinite axial slot on a circular cylinder clad with magnetoplasma

Abstract

This pap e r is concerned with the investigation of th e e ffects of a magnetoplasma layer on the radia· tion prope rties of an infinite axial slot on a circular cylinder when a finite magnetostatic field is in th e axial direction. Formulas have been obtained for th e field s e ve rywhere around th e cylinder and for any thi c kness of the magnetoplas ma. The solution is simplifi e d by a first orde r approximation , valid only for s mall thic knesses of the laye r. For a s mall " koa" the harmonic series converges we ll and is used for numerical co mputations . For large "koa" the conve rge nce is improve d by applying th e Watson's tran s formation . Di s torti on, attenuation, and asymmetry of th e radiation pa tte rn are shown as a function of the s tre ngth of th e magne tos tatic fi e ld . It is found th at th e reve rsa l of th e ori e ntati o n of th e magnetos tati c fi eld produ ces a s hift of the patt e rn to a mirror.image position.

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

“…Mushref [35,36] studied radiation and gain patterns of a dielectric-coated cylinder having two slots. Many authors [37][38][39] have investigated the effects of various plasma coatings upon the radiation patterns of an axially slotted cylinder. It is studied that, as the operating frequency is below the plasma frequency of the plasma coating, less energy is guided peripherally, and the pattern is more sharply broadside-directed.…”

“…They are also used in standard desktop microwave devices for research purposes. Such types of axially slotted cylinders covered with coating materials have greater control of the radiation and gain characteristics and have been studied by several authors [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Hurd [30] and Shafai [31] studied radiation properties of an axially slotted cylinder coated with a dielectric material.…”

An axially slotted cylinder with specific inhomogeneous coatings

“…It is assumed that axial slot is narrow and has a constant electric field distribution E a , which is maintained across the slot for − ϕ o /2 ≤ ϕ ≤ ϕ o /2. This slot excitation can be expanded in a complex Fourier series using [8, 19] and is given below: …”

“…He studied that if the operating frequency is below the plasma frequency, then less energy is guided peripherally and the field pattern is mostly broadside-directed. Marchin and Tyras [8] have studied the radiated field patterns of an axially slotted cylinder coated with a magnetoplasma layer. They also analyzed that the reversal of the orientation of the magneto-static field causes a shift of the pattern to a mirror image position.…”

Gain properties of an axially slotted cylinder with two coating layers

“…The effects of plasma coatings upon the radiation properties of an axially slotted cylinder have been studied by many authors [8–10]. Wu and Ren [11] investigated the radiation properties of an axial slot with an anisotropic dielectric coated circular cylinder.…”