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Abstract
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| We present a design method for waveguide circuits based on radial modes scattering [1]. Our method consists on the definition of a cylindrical region extracted from a rectangular waveguide. In order to design a specific circuit, the waveguide is divided into two regions: one outside the cylinder and the other one inside the cylinder. The external region needs only to be simulated once and it is studied with the Finite Element Method (FEM) to obtain a Generalized Admittance Matrix (GAM). This GAM relates the mode amplitudes of the rectangular waveguide and the ones of the radial waveguide and related to the concave cylindrical port. Inside the cylinder, an array of radial waveguide ports is defined, i.e., smaller cylinders that can contain arbitrary posts or other structures. For each of these smaller cylinders, a Generalized Scattering Matrix (GSM) can be calculated independently and used to analyze an arbitrary array of posts. Each post?s position and turn angle can be arbitrarily chosen with the only requirement that these smaller cylinders do not overlap. With the geometrical definition of the problem, it is possible to calculate the GSM of the array of posts using the formulation of radial modes addition theorems. From this array GSM, the GAM of the cylindrical region is computed. This GAM is then linked with the GAM of the external region, defined between the concave cylindrical port and the rectangular waveguide ports, in order to obtain the GAM for the waveguide circuit. It must be emphasized that the rotation and translation of posts effects is analytically calculated thanks to our formulation, recently applied to analyze Substrate Integrated Waveguide (SIW) circuits [2]. This design methodology for waveguide circuits simplifies optimization because there is no need to repeat electromagnetic simulations when the positions of posts and turns are changed. | |
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International
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Si |
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Congress
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13th Iberian Meeting on Computational Electromagnetics. |
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960 |
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Place
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Potes(Cantabria) |
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Reviewers
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Si |
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ISBN/ISSN
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CDP08UPM |
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Start Date
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15/10/2019 |
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End Date
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18/10/2019 |
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From page
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1 |
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To page
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5 |
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13th Iberian Meeting on Computational Electromagnetics. |