研究目的
To design, develop, and characterize a compact wide band 3D printed circular waveguide based polarizer operating in Ka-band (28-34 GHz) for application in millimeter wave frequencies and beyond.
研究成果
A highly compact waveguide based polarizer was designed at Ka-band, achieving a 3dB axial ratio and 15 dB impedance matching bandwidth of 20% with beamwidth of ± 30o. The simple geometry leads to relaxed tolerance requirements, making the design amenable for 3D metal printing.
研究不足
The design is prone to fabrication and measurement alignment errors, and the 3D fabrication errors < 0.05 mm in the transverse plane are not guaranteed for the first fabrication model.
1：Experimental Design and Method Selection:
The polarizer structure was investigated using fundamental and higher order modes, and a simplified equivalent structure was derived to understand its mechanism of operation. The design consists of a pair of radially opposite grooves inside a circular waveguide excited using a coaxial probe.
2：Sample Selection and Data Sources:
The design was compared with other existing waveguide based polarizers in terms of electrical and physical parameters.
3：List of Experimental Equipment and Materials:
Fabrication was done using high resolution direct metal aluminum 3D metal printing.
4：Experimental Procedures and Operational Workflow:
The design was verified for higher order mode propagation and optimized in HFSS. The polarizer was characterized in far-field anechoic chamber facility.
5：Data Analysis Methods:
The performance was analyzed using Ansys HFSS, and the measured results were compared with the simulated ones.
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