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In this paper, an approximate closed-form expression of the electric field of a conical horn with linear flare is formulated. Copolarization and cross polarization component of the electric field are calculated from the
spherical field components using Ludwig’s third definition of copolarization and cross polarization. The calculated field expressi...
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... geometry of conical horn antenna with linear flare is shown in Fig. 1. The coordinate system in relation to the geometry is also shown. Here a w is the waveguide radius, a is the aperture radius, L is the length of the horn, h is the length of the flare section, and θ o is the semi flare angle. The radiation characteristic of the conical horn antenna depends on the dimension parameters. The dimension ...
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... planes and other practical dimension parameters. It is seen that the maximum cross polarization level of the conical horn antenna is approximately -23 dB. Corrugated horn antennas have a much lower cross polarization level [16]. This makes them suitable as feeds for parabolic or Results from the derived closed form equation Experimental data Fig. 11 Comparison of copolarization electric field at φ = 90° plane calculated from the closed-form expression and experimental data for a conical horn with a = 1.7 λ and L = ...
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... In such cases, the conical horn is preferred to the corrugated horn [18]. Fig. 9 shows the three dimensional normalized copolar electric field component in the Fraunhofer region. Equation (33) and (34) are used to generate the three dimensional plot. The main lobe of the horn antenna along with the side lobes is clearly visible in the figure. Fig. 10 and Fig. 11 show comparisons of the derived closed-form expressions with experimental data. The experimental data are obtained from literature [3], [7]. The copolarization electric field in the Fraunhofer region is calculated using (35) and (36) along with (33) and (34). It can be observed that the derived closed-form expressions are ...
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... cases, the conical horn is preferred to the corrugated horn [18]. Fig. 9 shows the three dimensional normalized copolar electric field component in the Fraunhofer region. Equation (33) and (34) are used to generate the three dimensional plot. The main lobe of the horn antenna along with the side lobes is clearly visible in the figure. Fig. 10 and Fig. 11 show comparisons of the derived closed-form expressions with experimental data. The experimental data are obtained from literature [3], [7]. The copolarization electric field in the Fraunhofer region is calculated using (35) and (36) along with (33) and (34). It can be observed that the derived closed-form expressions are in close ...
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Part 1-3a: Design a conical horn excited by a Ka-band circular waveguide (choose the waveguide diameter that support the dominant TE11 mode). The horn should have a maximum directivity of 18.5 dB at the center frequency of 30 GHz. In addition, the horn should achieve symmetry radiation patterns (Equal E-plane and H-plane patterns within the main beam that has a beam width of-10 dB) a) Give the dimensions in cm. b) Calculate the radiation patterns and calculate the operating bandwidth to keep the directivity of 18.5dB ± 0.5dB. c) Calculate the matching bandwidth that achieves 20 dB return loss. Part 1-3b: What are your suggestions to improve the radiation characteristics of the horn in problem in Part 1 to achieve lower cross polarization and low back and side lobe levels. Provide a design and a brief discussion regarding your suggestions. Can you determine the phase center location of the horn with respect to the aperture plane for the pattern within the beam width of-10dB.? ABSTRACT Conical Horn antenna is a horn in the shape of a cone, with a circular cross section. They are used with cylindrical waveguides. The gain of horn antennas ranges up to 25 dBi, with 10-20 dBi being typical. Here, Ka-band Conical antenna is discussed which works from 26.5GHz to 40GHz having gain of 18.5dB at 30GHz. Then, Corrugation Technique has been used to reduce the Back lobe, sidelobe and cross-polarization. Afterwards, this can be a very effective antenna for 5G applications. Part 1-3a: Design a conical horn excited by a Ka-band circular waveguide (choose the waveguide diameter that support the dominant TE11 mode). The horn should have a maximum directivity of 18.5 dB at the center frequency of 30 GHz. In addition, the horn should achieve symmetry radiation patterns (Equal E-plane and H-plane patterns within the main beam that has a beam width of-10 dB) a) Give the dimensions in cm. b) Calculate the radiation patterns and calculate the operating bandwidth to keep the directivity of 18.5dB ± 0.5dB. c) Calculate the matching bandwidth that achieves 20 dB return loss. Part 1-3b: What are your suggestions to improve the radiation characteristics of the horns in problem in Part 1 to achieve lower cross polarization and low back and side lobe levels. Provide a design and a brief discussion regarding your suggestions. Can you determine the phase center location of the horn with respect to the aperture plane for the pattern within the beam width of-10dB.?
