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A penta-band frequency bowtie antenna design is presented to operate at five different frequencies: 5 (WLAN), 5.7 (WLAN), 6.8, 8.65 and 11 GHz for mobile and wireless communications. The additional frequencies resulted from adding 3 metallic strips of different sizes to both sides of the aperture bowtie antenna. Two pairs of strips have the same dimensions while the other two strips are unequal and...
The equivalence principle and the moment method which was previously employed in the solution of single-step waveguide discontinuities, is extended to solve for the field and the scattering matrix coefficients at the junctions of multiple-step discontinuities. Scattering matrix coefficients are computed for representative double-step discontinuities and frequencies. The method is simple and straightforward,...
Analytic solution is presented to the problem of scattering of a plane wave from a chiral elliptic cylinder placed in another infinite chiral medium, using the method of separation of variables. The incident, scattered as well as the transmitted electromagnetic fields are expressed in terms of appropriate angular and radial Mathieu functions with expansion coefficients. The scattered and transmitted...
The normalized backscattering and bistatic cross sections for a linear array of N dielectric spheres are computed and presented graphically over wide ranges of permittivity, separation, size, and angle of incidence. The results show reduction in the normalized backscattering and bistatic cross sections for certain choices of permittivity relative to arrays of perfectly conducting spheres of same dimensions...
The problem of multiple scattering of a plane electromagnetic wave incident on N dielectric spheres is investigated by two methods. The first is based on the multipole expansion method which gives analytic solution by using the spherical vector addition theorem to impose the boundary condition, while the second is an approximate method valid for relatively small spheres. Expressions for the total...
The equivalence principle and the moment method are used to present a solution for the scattering matrix when a number of waveguide junctions (more than one) are considered together in a cascade. This solution presents each two consecutive waveguide junctions by their scattering matrix. The overall scattering matrix of a cascade of waveguide junctions can be obtained by the multiplication of the scattering...
This paper presents a new design for aperture bowtie antenna with added rectangular and U shape metal strips to function at new different frequencies: 8.2, 9.25 and 10.5 GHz. The advantage of the proposed design is to use the original antenna shape and its dimensions to achieve the multiple frequencies. The proposed design consists of adding 2 U shape metal strips of similar sizes as well as 4 rectangular...
A CPW bowtie aperture antenna loaded with metal strips is presented to operate at tri-band frequencies: 8.45, 9.5 and 10.8 GHz. The new frequencies are achieved without increasing the size of the original unloaded antenna. The new antenna is loaded with 16 rectangular strips of different sizes to operate at tri-band frequencies. The antenna is symmetrical to CPW feed. The simulated results using HFSS...
Radiation characteristics of an axially slotted elliptic antenna coated by conventional dielectric or metamaterial material embedded partially in a ground plane are investigated analytically. The field in each region is expressed in terms of appropriate radial and angular Mathieu functions with unknown field coefficients. The boundary conditions at the conducting, dielectric coating and ground plane...
Radiation characteristics of an axially slotted circular or elliptical antenna coated with biaxial anisotropic material are investigated theoretically. The fields in every region are expressed in terms of Mathieu functions with unknown coefficients. The boundary conditions at the conducting and dielectric surfaces are applied to obtain the unknown field expansion coefficients. Numerical results are...
Scattering of a plane electromagnetic wave by a PEMC elliptic cylinder loaded with chiral material has been solved analytically. The field in every region is expressed by using elliptic wave functions. The unknown expansion field coefficients are obtained by enforcing the boundary conditions at various surfaces. Numerical results presented graphically for various geometry parameters.
An exact solution to the problem of scattering of an electromagnetic field incident from an arbitrarily located and arbitrarily oriented dipole by a coated perfect electromagnetic conducting (PEMC) sphere is obtained by expressing the fields associated with the problem in terms of appropriate spherical vector wave functions and a set of expansion coefficients. The coefficients associated with the...
An exact solution is presented to the problem of scattering of a plane wave by a chiral semi-elliptic-cylindrical boss located on an infinite perfectly conducting ground plane. The problem is formulated by expressing the incident, reflected, scattered as well as the transmitted electromagnetic fields in terms of appropriate angular and radial Mathieu functions and sets of expansion coefficients. The...
Exact analytic solution is presented to the problem of scattering by perfect electromagnetic conducting (PEMC) elliptic cylinder coated by metamaterial due to a plane wave illumination. The problem is formulated by expanding the various fields in terms of appropriate angular and radial Mathieu functions and a set of expansion coefficients. The expansion coefficients associated with the incident fields...
A small size low profile monopole antenna for mobile communication is presented using magnetic coating. The obtained FDTD simulation results show that a magnetic dielectric coating surrounding the monopole antenna may reduce its size approximately by 50%. The antenna size reduction may be controlled by using appropriate magnetic dielectric coating without significant effect on the radiation characteristics...
Analytic solution to the problem of scattering by an infinitely long perfect electromagnetic conducting (PEMC) strip is obtained using the method of separation of variables. The scattering widths can be enhanced/reduced by choosing appropriate values of PEMC admittance.
A solution is presented to the problem of scattering of electromagnetic waves from a perfect electromagnetic conducting spheroid, when it is excited by a plane wave of arbitrary polarization and angle of incidence. It is realized by expressing the incident and scattered electromagnetic fields in terms of vector spheroidal wave functions and then imposing the appropriate boundary conditions on the...
The far field characteristics of an axially slotted elliptical antenna coated with lossy and lossless multi-dielectric metamaterials layers are investigated. The fields in the various regions are expressed in terms of complex Mathieu functions. The unknown field expansion coefficients in every region are obtained by applying the boundary conditions at various surfaces. Numerical results are obtained...
An analytic solution to the problem of scattering of a plane electromagnetic wave by a lossy or lossless dielectric confocal elliptic shell loading a semi-elliptic channel is derived. The incident, scattered and transmitted fields in every region are expressed in terms of complex Mathieu functions. Applying the boundary conditions at various faces and interfaces along with the partial orthogonality...
Exact solution to the electromagnetic radiation from a conducting slotted circular or elliptical cylinder coated by an Isorefractive metamaterials is derived by using the separation of variables technique. The fields inside and outside the dielectric layer are expressed in terms of Mathieu functions. No matrix inversion is required after obtaining expressions for the radiated field expansion coefficients...
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