# Radiation from wide-flare corrugated E-plane sectoral horns

01 Aug 1973-Vol. 22, Iss: 4, pp 603-608

TL;DR: In this article, the radiation properties of wide-flare corrugated E-plane sectoral horns (10°deg, where α is the halfflare angle) excited in the HE_{11} mode with improved Eplane radiation patterns and suppressed side-lobe levels over a broad bandwidth is described.

Abstract: An analytical and experimental investigation of the radiation properties of wide-flare corrugated E -plane sectoral horns ( 10\deg , where \alpha_{0} is the half-flare angle) excited in the HE_{11} mode [1] with improved E -plane radiation patterns and suppressed side-lobe levels over a broad bandwidth is described in this paper. Given the flare length and half-flare angle of the horn, the far-field radiation pattern is determined by two methods, one of which involves aperture-field integrations based on vector diffraction formula over a constant phase surface at the mouth of the horn and the other of which employs an expansion of the aperture field in terms of free-space cylindrical TE and TM wave functions. Good agreement is obtained between the two methods with measured radiation patterns for several values of \alpha_{0} . Given the flare lengthy variation of the on-axis gain with \alpha_{0} of the horn is analytically investigated, and the design procedure for determining optimum \alpha{0} , in order to obtain maximum on-axis gain, is also indicated. Furthermore, design and experimental studies on wide-flare horns under consideration are also summarized.

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TL;DR: In this article, a hybrid modal-spectral method (HMSM) was proposed to solve the entire problem of corrugated and noncorrugated rectangular horn antennas.

Abstract: A hybrid technique is proposed to solve the entire problem of corrugated and noncorrugated rectangular horns without the usual approximations The horn antenna is simulated by a multistepped waveguide structure radiating into half-space The procedure is composed of three steps First, assuming the horn to be terminated by infinite metallic flange, the aperture problem is accurately solved by a hybrid modal-spectral method (HMSM) Second, the modal analysis (MA) method and scattering matrix concept of waveguide discontinuities are employed to solve the transverse multidiscontinuity problems Finally, the two methods are combined (MA-HMSM) to solve the entire problem of the horn antenna The proposed technique allows to obtain not only the radiation patterns, but also the reflection and near-field characteristics of the horn, without any restriction on the geometry (semiflare angles, profiled horn contours, corrugations) A good agreement between theoretical predictions and experimental results has been obtained for several horns

34 citations

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TL;DR: In this paper, a horn antenna with low backlobe and sidelobe levels in its E-plane is proposed, which can be implemented by both ordinary dielectric materials and isotropic graded refractive index (GRIN) materials.

Abstract: Transformation optics is a convenient way to control the pattern of electromagnetic fields. In this paper, using a novel transformation, we propose the design procedure of a horn antenna having low backlobe and sidelobe levels in its E-plane. By applying conformal transformation, the rectangular horn proposed in this paper can be realized with isotropic materials. This proposed antenna can be easily implemented by both ordinary dielectric materials and isotropic graded refractive index (GRIN) materials. In the first proposed design, in addition to the isotropy, homogeneity is furthermore introduced into the horn, and only four kinds of isotropic materials are required throughout. In the second design, it is demonstrated that the designed structure can also be implemented by graded photonic crystals (GPCs) operating in metamaterial regime. They have low loss as well as broad frequency band and are easy to implement. Simulation results are presented to validate the design approach.

14 citations

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TL;DR: In this paper, the E -plane radiation patterns of wide-flare corrugated conical and E-plane sectoral horns were obtained employing the theory of Kouyoumjian and Pathak and the slope diffraction technique.

Abstract: The E -plane radiation patterns of wide-flare corrugated conical and E -plane sectoral horns ( 2\alpha_{0} ) excited in the dominant mode are obtained employing the theory of Kouyoumjian and Pathak [12] and the slope diffraction technique [11]. Besides the other parameters of the horn, the finite thickness of the corrugated edge has been taken into account with a view to improve the accuracy of the pattern computation. The analysis presented enables one to predict accurately radiation patterns over the main beam, near and far sidelobes, and the back lobes of the horns. Validity of the analysis is established by satisfactory agreement between the calculated and measured E -plane patterns of a few typical experimental wide-flare corrugated conical and E -plane sectoral horns.

1 citations

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TL;DR: In this article, two different E-plane sectoral horn power dividers are designed and produced to be used with an X-band antenna array having 30 dB Taylor distribution for high-power antenna array applications.

Abstract: E-plane sectoral horn power divider design method for high-power antenna array applications is presented. In this method, power division is proportional to the cross section areas of the waveguide channels at the aperture of an E-plane sectoral horn antenna. Two different power dividers are designed and produced to be used with an X-band antenna array having 30 dB Taylor distribution. The first one employs a simple E-plane sectoral horn antenna. This straightforward application of the method might be limited with production tolerances. The second one incorporates a corrugated E-plane sectoral horn antenna, whose design is relatively complex but less sensitive to production tolerances. The produced dividers are compared based on simulations and measurements and good agreement with the theoretical expectations is observed for both types.

1 citations

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TL;DR: In this article, the radiation characteristics of corrugated E-plane sectoral horns are studied and a separable modal solution of fields in terms of TE to z modes is obtained for this geometry.

Abstract: A study of the radiation characteristics of corrugated E -plane sectoral horns is described. Assuming the corrugations to be infinitely thin and sufficiently close packed, impedance boundary conditions are imposed on the fields in the axial region of the horn and it is established that a separable modal solution of fields in terms of TE to z modes is possible for this geometry. The horn aperture field is determined in terms of cylindrical wave functions and the vector diffraction formula is used to analyze the far-field radiation patterns. Excellent agreement is obtained between the theoretically derived pattern with experimental results for horns supporting the balanced HE_{11} mode with small flare angles ( 2_{\alpha 0} \leq 30\deg ), designed using the theory presented. Bandwidth properties of the horn have been studied which may be used to advantage in designing a corrugated E -plane sectoral horn without much degradation of its radiation characteristics corresponding to the balanced HE_{11} made over a wide frequency bandwidth (1.5:1).

27 citations

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TL;DR: In this paper, a correction to the available radiation formula for E -plane sectoral horn has been proposed, which is shown to be in better agreement with the measured radiation patterns for several values of fiare-angles of the E-plane Sectoral horns.

Abstract: A correction to the available radiation formula [1] for E -plane sectoral horn has been proposed. Calculated radiation patterns based on the corrected formula, are shown to be in better agreement with the measured radiation patterns for several values of fiare-angles of the E -plane sectoral horns.

5 citations