A 225 GHz Circular Polarization Waveguide Duplexer Based on a Septum Orthomode Transducer Polarizer

TítuloA 225 GHz Circular Polarization Waveguide Duplexer Based on a Septum Orthomode Transducer Polarizer
Tipo de publicaciónJournal Article
Year of Publication2013
AutoresLeal-Sevillano, C. A., K. B. Cooper, J. A. Ruiz-Cruz, J. R. Montejo-Garai, and J. M. Rebollar
JournalIEEE Transactions on Terahertz Science and Technology
Volumen3
Pagination574-583
Date PublishedSep.
ISSN2156-342X
Palabras claveCircular polarization, duplexer, orthomode transducer, terahertz
ResumenIn this paper, we present the modeling and experimental validation of an efficient, compact, and high-isolation waveguide duplexer operating at 225 GHz. While duplexers based on ferrite circulators are key components of many monostatic radar systems, at W-band frequencies and above the performance of waveguide circulators rapidly deteriorates. The design presented here uses a ferrite-free duplexing concept based on transmitting and receiving in orthogonal circular polarizations. The circular polarization is efficiently generated in waveguide using a septum orthomode transducer polarizer, leading to a compact device with a single horn antenna. The complete duplexer is designed using efficient numerical algorithms, resulting in a fabricated device with a measured 10% fractional bandwidth, a return loss better than 20 dB, isolation of 30 dB, and insertion loss below 1 dB.
URLhttp://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6525512
DOI10.1109/TTHZ.2013.2264317