A New Conical Band-Reject Uwb Antenna With Uniform Rejection and Stable Omnidirectional Behavior

Khorshidi, Mohammadreza; Tahanian, Esmaeel

doi:10.2528/pierc15071102

Cited by 9 publications

(4 citation statements)

References 20 publications

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“…The first term in the representation in Equation 7corresponds to TEM-wave with two nonzero components in biconical area (E r ≡ 0, E θ , H ϕ = 0), and the other terms are elementary axially symmetric TM-modes. From expressions (2) and 7it follows that the field components satisfy the radiation and boundary conditions, and for r → 0 we arrive at…”

Section: Statement Of the Problemmentioning

confidence: 99%

“…Bi-conical antennas possess the broadband properties, provide an omnidirectional radiation, and their characteristics, which are necessary for signal transmission, can be achieved by the bi-conical structures of small size. Different types of bi-conic antennas are widely applied in modern communication technologies; they are also used for reference measurements and system verifications [1][2][3][4][5][6][7]. The use of bi-cones as the radiating elements in the radio communication started more than a century ago [8].…”

Section: Introductionmentioning

confidence: 99%

“…The widespread use of bi-conical elements in different areas of modern physics and technology, including nanotechnologies [27,28], requires a deep study of the physical properties of electromagnetic fields interaction with bi-conical structures. Contemporary theoretical studies of the scattering properties of the bi-cones are based on the mathematical modeling, which uses the direct numerical methods [1,2] and the mode-matching technique in time domain [29] which is based on the Mode Basis Method [30].…”

Section: Introductionmentioning

confidence: 99%

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Diffraction of Axially-Symmetric Tm-Wave From Bi-Cone Formed by Finite and Semi-Infinite Shoulders

Kuryliak¹

2016

PIER B

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The problem of axially-symmetric TM-wave diffraction from a perfectly conducting bi-cone is analyzed. Bi-cone is formed by finite and semi-infinite conical shoulders and illuminated by ring magnetic source. The problem is formulated in a spherical coordinate system as a mixed boundary problem for Helmholtz equation. The unknown H ϕ-diffracted field is sought as expansion in series of eigenfunctions for each region, formed by the bi-cone. The solution of the problem then is reduced to the infinite set of linear algebraic equations (ISLAE) of the first kind by means of mode matching technique and orthogonality properties of the eigen functions. The main parts of the asymptotic expressions of ISLAE matrix elements, determined for large indexes, identify the convolution type operator. The corresponding inversed operator is represented in an explicit form. Two of these operators are applied to reduce the problem to the ISLAE of the second kind and to determine the new analytical regularization method for the solution of wave diffraction problems for bi-conical scatterers. The unknown expansion coefficients can be determined from the ISLAE with the given accuracy by the reduction method. The particular cases such as low frequency approximation and transition from bi-cone to conical monopole and disc-cone scatterer are analyzed. The numerically obtained results are applied to the analysis of scattering properties of hollow conical monopoles and disc-conical scatterers.

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Section: Statement Of the Problemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diffraction of Axially-Symmetric Tm-Wave From Bi-Cone Formed by Finite and Semi-Infinite Shoulders

Kuryliak¹

2016

PIER B

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“…Based on the correlation (50), the coefficients (49) may be rewritten in a very simple form (0) = g (1) ;…”

Section: Low Frequency Solutionmentioning

confidence: 99%

Wave diffraction from the Biconical Section in the semi‐infinite conical region

Kuryliak

Sharabura

2019

Math Methods in App Sciences

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The electromagnetic problem by the finite bicone, which is formed with the perfectly conducting semi-infinite cone and the finite cone with truncated vertex, is studied. Bicone is excited axial-symmetrically by the ring magnetic source.The diffracted field is represented through the series of the transversal magnetic (TM) modes; the lower mode among them is called the transversal electromagnetic wave (TEM). On the basis of this representation and using the mode matching technique, we derive the series equations to determine the unknown complex modes magnitudes. In view of the electric field singularities at the conical edges, these equations are represented in the form of the limiting transition from the finite sums to the series. We derive the rule of this transition, as well as the procedure for reducing them to the infinite system of linear algebraic equations (ISLAE) of the first kind. We study asymptotic properties of the matrix elements and find that the main part of their static limit and their behavior for large indexes form the matrix operator of the convolution type; the corresponding inverted operator in the analytical form is obtained. Both these operators, which we call the regularization operators, are used for the transition from the ISLAE of the first kind to the ISLAE of the second kind. The ISLAE thus obtained allow for the solution of any geometrical parameters and frequency with the given accuracy. The asymptotic properties of their solutions are analyzed, and the numerical examinations of the far field patterns are provided.

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New technique for designing wideband one layer frequency selective surface in X‐band with stable angular response

Rahzaani

Dadashzadeh

Khorshidi

2018

Micro & Optical Tech Letters

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In this article, a new method is presented for designing frequency wideband unit cell to use in frequency selective surfaces (FSSs). A double slot square loop (DSSL), which has 2 resonant frequencies, is selected as a primary FSS unit cell and its frequency bandwidth is increased with the proposed method. The effect of the applied innovation on frequency response of DSSL unit cell is investigated by equivalent circuit presented in this paper. Simulated frequency response of the designed unit cell shows that frequency bandwidth of this unit cell increases in comparison with that of primary unit cell. A FSS structure with the designed unit cell is fabricated and its measured return loss confirms that, the frequency bandwidth of the proposed structure is about 50% in X‐band. In addition, frequency response of this FSS structure is stable during 45 degree angle deviation of the incident wave from normal axis of the FSS surface. High frequency bandwidth, low fabrication complexity and stable angular response are the favorable characteristics of the proposed FSS structure which make it suitable for using in microwave filters.

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A New Conical Band-Reject Uwb Antenna With Uniform Rejection and Stable Omnidirectional Behavior

Cited by 9 publications

References 20 publications

Diffraction of Axially-Symmetric Tm-Wave From Bi-Cone Formed by Finite and Semi-Infinite Shoulders

Diffraction of Axially-Symmetric Tm-Wave From Bi-Cone Formed by Finite and Semi-Infinite Shoulders

Wave diffraction from the Biconical Section in the semi‐infinite conical region

New technique for designing wideband one layer frequency selective surface in X‐band with stable angular response

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