Orthomode Transducer Compactness via Superposed Waveguide Design
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Solution Overview
Problem
Existing orthomode transducer devices for antennas are too large in the plane of the mesh, causing incompatibility with the antenna's size and complicating the antenna's architecture, leading to increased mass and size requirements.
Innovation Solution
The orthomode transducer device design places the second auxiliary guide above the main guide, with parallel windows defined between the upper wall of the main guide and the lower wall of the second auxiliary guide, allowing for efficient coupling of electromagnetic modes without the need for a decoupling vane, optimizing compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional waveguide OMT design is used with auxiliary guides connected by bends, then the device can effectively separate orthogonal electromagnetic modes, but the size in the mesh plane becomes too large (typically greater than or equal to 1.2λ, often around 3λ)
Solution Approach 1:
The patent repositions the second auxiliary guide from a lateral connection to an upper position above the main guide, utilizing the vertical dimension (along the radioelectric axis) rather than expanding in the mesh plane. This dimensional transition reduces the footprint in the mesh plane while maintaining mode separation functionality through properly oriented parallel windows.
Solution Approach 2:
Instead of connecting auxiliary guides laterally to the main guide body, the invention inverts the connection approach by placing the second auxiliary guide above the main guide and connecting it through parallel windows defined between the upper wall of the main guide and the lower wall of the second auxiliary guide. This inverted configuration achieves compactness without sacrificing performance.
2Reliability
If larger OMT devices are used to ensure proper mode coupling, then effective orthomode transduction is achieved, but the antenna architecture becomes more complicated and mass requirements increase
Solution Approach 1:
The patent merges the coupling and decoupling functions into a unified configuration where parallel windows serve both purposes simultaneously. The same parallel windows that couple the second auxiliary guide to the main guide also provide the decoupling effect for the first mode, eliminating the need for separate decoupling components and simplifying the overall architecture.
Solution Approach 2:
The invention extracts and eliminates the decoupling vane component from the traditional OMT design. By using the parallel window configuration, the decoupling function is achieved without requiring a physical decoupling vane, thereby reducing the number of parts and simplifying the antenna architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves a more compact orthomode transducer device that reduces space requirements and simplifies the antenna architecture, enabling more efficient and compact antenna designs without the need for additional decoupling components.
Implementation Method 1
each parallel window is defined between an upper wall of the main guide and a lower wall of the second auxiliary guide, and oriented in relation to the main axis so as, on the one hand, to enable coupling of the main guide to the second auxiliary guide for the selective transfer of the second mode from one to the other
Data Source
AI summary
An orthomode transducer device (D), for an antenna, comprises (i) a main guide (GP) designed for the propagation along a main axis of first and second modes having polarizations orthogonal to each other and provided with a first end coupled to a circular port (AC) and a second end, (ii) a first auxiliary guide (GA1) designed for the propagation of the first mode along a first auxiliary axis and provided with a first end coupled in series to the second end of the main guide via a series window (FSP) and with a second end coupled to a series port (AS), and (iii) a second auxiliary guide (GA2) designed for the propagation of the second mode along a second auxiliary axis, coupled to the main guide via a parallel window (FPL) and provided with a first end coupled to a parallel port (AP). The first (GA1) and second (GA2) auxiliary guides are superposed. The parallel window (FPL) is defined between an upper wall (PS) of the main guide (GP) and a lower wall (PI) of the second auxiliary guide (GA2) and oriented in relation to the main axis so as to enable coupling of the main guide to the second auxiliary guide for the selective transfer of the second mode from one to the other, and so as to make the first mode propagate between the main guide and the first auxiliary guide.