研究目的
To present a 64% instantaneous bandwidth turnstile-junction-based orthomode transducer (OMT) made up of only three layers in a platelet configuration, incorporating an improved power combiner based on noncontacting matching steps machined in one layer, to achieve excellent electrical performance and compactness.
研究成果
The use of an improved E-plane T-junction waveguide power combiner based on two noncontacting prism matching steps in the design of platelet OMTs enables a reduction of the number of layers to a minimum, while maintaining excellent electrical performance over a quasi-octave bandwidth. The proposed OMT is especially suited for modern multipixel receivers applied to radio astronomy polarimetry.
研究不足
The performance degrades as it approaches the cutoff frequency of the structure (fc = 9.73 GHz). At 19.46 GHz, the higher order modes start to propagate.
1：Experimental Design and Method Selection:
The OMT was designed using a turnstile junction with quasi-octave bandwidth in the 10–20-GHz frequency range, incorporating an improved power combiner with noncontacting dual-step rectangular prism matching elements.
2：Sample Selection and Data Sources:
The OMT was machined in three layers of aluminum 6082 using standard Computer Numerical Control milling.
3：List of Experimental Equipment and Materials:
Aluminum 6082, Computer Numerical Control milling machine, vector network analyzer (VNA), coaxial (SMA)-to-waveguide transitions.
4：Experimental Procedures and Operational Workflow:
The OMT was designed and optimized with μWave Wizard from Mician and checked with CST Microwave Studio. Measurements were taken using suitably designed octave bandwidth coaxial (SMA)-to-waveguide transitions and the thru–reflect–line (TRL) calibration technique.
5：Data Analysis Methods:
Reflection and isolation measurements were analyzed to evaluate the OMT's performance.
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