volume | PIER Journals

2013-01-17

Ultra-Broadband High Efficiency Mode Converter

Abdelwahed Tribak,

Professor Abdelwahed Tribak

National Institute of Posts and Telecommunications (INPT)

Morocco

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Jamal Zbitou,

Dr. Jamal Zbitou

LITEN. Faculté Polydisciplinaire de Khouribga FPK

France

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Angel Mediavilla Sanchez,

Dr. Angel Mediavilla Sanchez

Dept. of Communication Engineering

University of Cantabria

Spain

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Naima Amar Touhami

Dr. Naima Amar Touhami

Faculty of Sciences

Abdelmalek Essaadi University

Morocco

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Progress In Electromagnetics Research C, Vol. 36, 145-158, 2013

doi:10.2528/PIERC12111905

Abstract

In this paper we develop a small-sized mode converter with high performance, high conversion efficiency and instantaneous bandwidth as high as 55%. This mode converter transforms energy from the TM01 first high-order mode towards the fundamental TE11 circular waveguide mode. The proposed structure increases the free spurious operating bandwidth in comparison with the existing results in literature. An X/Ku-bands experiment prototype unit was designed, ensuring practical return losses better than 28 dB and insertion losses less than 0.1 dB (conversion efficiency > 98.8%) within the entire frequency bandwidth ranging from 9.25 GHz to 16.25 GHz. The presented architecture offers useful features such as very wide bandwidth, small size, easy achievement as well as excellent performance, which makes it very suitable for High-power microwave (HPM) sources that generate the TM01 circular waveguide mode. In these cases the TE11 mode is needed since it has a convergent radiation pattern able to drive conventional antennas. Moreover, this compact concept is fully scalable to any millimeter frequency band.

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Abdelwahed Tribak, Jamal Zbitou, Angel Mediavilla Sanchez, and Naima Amar Touhami, "Ultra-Broadband High Efficiency Mode Converter," Progress In Electromagnetics Research C, Vol. 36, 145-158, 2013.
doi:10.2528/PIERC12111905

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