Design Methodologies of Compact Orthomode Transducers Based on Mechanism of Polarization Selectivity

An orthomode transducer (OMT) design is presented and implemented for future RF and millimeter-wave applications. The novelty of the proposed OMT stems from a distinct concept of handling dual-polarized signals on the basis of a polarization-selective coupler (PSC). The theory of the PSC is develope...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2018-03, Vol.66 (3), p.1279-1290
Main Authors: Sakr, Ahmed, Dyab, Walid, Wu, Ke
Format: Article
Language:English
Subjects:
Antenna frontends
Bandwidth
Computer simulation
Couplers
Couplings
Dielectric waveguides
Dielectrics
Dispersion
Dual polarization (waves)
Equivalent circuits
Millimeter waves
orthomode transducer (OMT)
Polarization
polarization-selective coupler (PSC)
Polarizers
Selectivity
Substrate integrated waveguides
substrate-integrated nonradiative dielectric (SINRD) waveguide
substrate-integrated waveguide (SIW)
Transducers
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Summary:An orthomode transducer (OMT) design is presented and implemented for future RF and millimeter-wave applications. The novelty of the proposed OMT stems from a distinct concept of handling dual-polarized signals on the basis of a polarization-selective coupler (PSC). The theory of the PSC is developed and understood through analyzing its constituent waveguides. Such waveguides are hybrid forms of nonradiative dielectric waveguide and substrate-integrated waveguide. An equivalent circuit model is deduced for modeling dispersion characteristics of the PSC. Consequently, design methodologies supported with comprehensive theoretical study and simulation analysis for a PSC-based OMT are developed and examined. The general design of a PSC-based OMT basically depends on a dielectric slab coupler waveguide with a longitudinal periodic PEC polarizer wall in its middle. Practical limitations for this design is discussed and supported with solutions using a proposed top slot coupler instead of the dielectric slab coupler. Closed-form equations are obtained as design recipes for computing structure dimensions and bandwidth based on operating frequency and the material parameters. The proposed structure is prototyped and measured. Measured results show an acceptable agreement with simulation results.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2017.2784822