Waveguide Orthomode Transducer Compact Symmetrical Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional waveguide orthomode transducers face limitations in power handling and higher order modes generation due to complex geometries and increased component count, which affects bandwidth performance and manufacturing sensitivity.
Innovation Solution
A waveguide orthomode transducer design utilizing two magic tees and tee junctions to connect similar ports, eliminating radio-frequency path crossings and reducing component count, resulting in a compact, symmetrical structure with improved power handling and reduced sensitivity to higher order modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional turnstile junction is used with four secondary waveguides, then the orthomode transducer can separate orthogonal polarizations, but the geometry becomes large and non-symmetrical leading to bandwidth performance degradation and higher order modes generation
Solution Approach 1:
The patent applies asymmetry by reducing the cross-section of specific waveguides (particularly the secondary waveguides) to create a more compact and symmetrical overall geometry. This selective cross-section reduction transforms the originally large and non-symmetrical turnstile junction into a compact symmetrical design that eliminates radio-frequency path crossings, thereby improving bandwidth performance and reducing higher order modes generation while maintaining the polarization separation function
Solution Approach 2:
The patent addresses the geometry problem by modifying the dimensional characteristics of the waveguide cross-sections. By reducing the cross-sectional dimensions of specific waveguides rather than changing the overall layout configuration, the design achieves a compact form factor in the transverse dimension while maintaining the functional separation of orthogonal polarizations through the turnstile junction topology
2Device complexity
If waveguide cross-section reduction is applied to achieve compact design, then the geometry becomes compact and symmetrical, but power handling capability is limited
Solution Approach 1:
The patent applies local quality by selectively reducing the cross-section of only certain waveguides (the secondary waveguides 11-14) while maintaining the full cross-section of the main waveguide (10). This localized dimensionality change allows the overall device to achieve a compact and symmetrical geometry while preserving the power handling capability of the main transmission path, as the main waveguide retains its original dimensions capable of handling high power signals
3Reliability
If four magic tees are used to suppress radio-frequency path crossings, then path crossings are eliminated, but the component count increases to three components per radio-frequency path
Solution Approach 1:
The patent extracts and eliminates the need for additional magic tees by directly configuring the turnstile junction with properly oriented secondary waveguides. Instead of adding four magic tees (three components per path) to suppress radio-frequency path crossings, the invention uses the inherent geometry of the turnstile junction with reduced cross-section secondary waveguides to achieve path isolation, reducing the component count from three per path to just one (the turnstile junction itself)
Data Source
AI summary
A waveguide orthomode transducer, comprises: a junction having a main waveguide and four auxiliary waveguides lying along the two orthogonal main axis of the junction and defining four quadrants; a combination network comprising: two magic tees, each having an E-port, two opposed common-ports, and a H-port; an H-plane tee junction having a Σ-port and two opposed common-ports; and an E-plane tee junction having a Δ-port and two opposed common-ports. Two auxiliary waveguides define a first quadrant are respectively connected to the common-ports of one of the magic tees and the two other secondary waveguides defining a second quadrant opposite to the first quadrant are connected to the common-ports of the other magic tee. The tee junctions are used to connect similar magic tee ports so that the transducer separates towards two different outputs two orthogonally polarized signals entering at the main waveguide. Reciprocally, two signals entering respectively in the Σ-port and the Δ-port of the tees junctions are combined with orthogonal polarizations in the main waveguide.