Broadband Septum Polarizer With Triangular Common Port

This article presents a novel broadband septum polarizer with a relative bandwidth (BW) of 37.8%. This is significantly more than the approximate 25% BW of square and circular waveguide polarizers. It is enabled by using an equilateral triangular common port waveguide, which guarantees the largest p...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2020-02, Vol.68 (2), p.693-700
Main Authors: Deutschmann, Bjorn, Jacob, Arne F.
Format: Article
Language:English
Subjects:
Additive manufacturing
Broadband
Broadband antennas
Broadband communication
circular polarization
Circular waveguides
Cutoff frequency
dual polarization
Frequency ranges
Jacobian matrices
Microwave theory and techniques
orthomode transducers (OMT)
Polarizers
Rectangular waveguides
Septum
septum polarizer
triangular waveguide
Waveguide transitions
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Summary:This article presents a novel broadband septum polarizer with a relative bandwidth (BW) of 37.8%. This is significantly more than the approximate 25% BW of square and circular waveguide polarizers. It is enabled by using an equilateral triangular common port waveguide, which guarantees the largest possible frequency range between fundamental and next higher order mode cutoff. The transition between the triangular section and the rectangular input waveguides, which includes the septum, is designed to accommodate this large BW. The simulation is validated using a polarizer designed for 75-110 GHz and fabricated by conventional precision milling. A second polarizer is realized for the 18-to-26 GHz range by employing additive manufacturing to demonstrate the advantages of this technology in this context. In both cases, the axial ratio remains below 1.3 dB, whereas the input port isolation and the input return loss exceed 17 and 15 dB, respectively.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2019.2951138