Large parabolic reflector8/2/2023 ![]() The default value of the directivity is 15dB. The wizard calculates the aperture dimensions and length of the horn for a given directivity value. The waveguide supports the dominant TE 10 mode within this frequency range. In this project, the waveguide feed is a standard WR-90 hollow rectangular waveguide with an operational frequency bandwidth of 8.2GHz - 12.4GHz. The basic steps of constructing and analyzing a pyramidal horn antenna are discussed in detail in EM.Tempo Tutorial Lesson 7: Designing A Pyramidal Horn Antenna. The waveguide feed has a short plate at its other end. EM.Cube provides a convenient horn wizard that creates the geometry of a pyramidal horn antenna with a rectangular waveguide feed. The figure below shows the geometry setup in EM.Illumina.ĢD dB-scale Cartesian radiation pattern of the parabolic reflector in the ZX (H) plane.Īs a real feed mechanism, we will next consider a waveguide-fed pyramidal horn antenna. We place a Y-directed Hertzian short dipole radiator at the focal point of this reflector to excite it. This is a fairly large reflector that can be analyzed using EM.Illumina's IPO solver. The operating frequency is f = 10GHz and the free-space wavelength at this frequency is λ 0 = 30mm. \cot \left( \frac \right) Initial Physical Optics Analysis of the Parabolic Reflectorįor this project, first we consider an X-band parabolic reflector with the following specifications: ![]() The subtended angle θ 0 is calculated from the following formula given by Ref. The parabola has a focal length of f, an axial length (depth) of c and an aperture diameter of d. The geometry of a parabola is shown in the figure below. Then, we add a realistic pyramidal horn feed to the reflector and simulate the combination antenna using EM.Tempo's full-wave FDTD solver. In this application note, first we investigate the radiation characteristics of a large X-band parabolic reflector at 10GHz using EM.Illumina. In problems like this, a full-wave simulation of the entire structure is needed. In many realistic situations, however, the reflector's feed structure cannot be approximated as a simple point source or it may even cause blocking effects. The basic steps of simulating a parabolic reflector antenna using the IPO solver are described in detail in EM.Illumina Tutorial Lesson 3: Computing The Radiation Pattern Of Parabolic Dish Reflectors. Therefore, IPO is a good candidate for solving large parabolic reflector antenna structures. IPO effectively compensates for the shortcomings of GOPO with regard to multiple shadowing effects and handling of concave surfaces that support multi-bounce rays. Besides the conventional Geometrical-Optics-Physical-Optics (GOPO) technique, EM.Illumina ( EM.Cube's PO Module) offers a generalized Iterative Physical Optics (IPO) solver. For example, a parabolic reflector with a very large focal length can be modeled using a Hertzian short dipole radiator placed at its focal point. The Physical Optics (PO) technique can solve reflector problems efficiently when the details of the feed mechanism can be neglected. Parabolic reflectors are typically used as high-gain antenna due to their electrically very large aperture dimensions. 6 Simulating a Larger Parabolic Reflector.5 Analyzing the Reflector-Horn Combination Antenna Using EM.Tempo.3 Initial Physical Optics Analysis of the Parabolic Reflector.
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