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A Compact Two-dimensional Power Divider for a Dielectric Rod Antenna Array Based on Multimode Interference

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Abstract

In this work, multimode interference is investigated for the design of a two-dimensional fully dielectric power divider, well suited for the usage of dielectric waveguides. Most important, power division is achieved in a single device without the need of cascading multiple dividers. This allows to design a very compact and lightweight power divider, well applicable for dielectric rod antenna arrays. As a proof of concept for the used technique, a 16-way power divider with 4 × 4 output ports, made out of Rexolite, is realized, working in a frequency range between 90 and 105 GHz. For the S-parameter measurements, a special measurement setup, including a modular pin probe technique as well as radiation taper for waveguide termination, is proposed. The measurements are in good agreement with the simulations with a power split of − 15 dB for all output ports within the desired frequency range. This is equal to an additional insertion loss of 3 dB. To demonstrate the usability for antenna arrays, a fully dielectric rod antenna array is realized based on the proposed power divider. With this array, a gain of 22.5 dBi at 97.5 GHz was achieved.

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Acknowledgements

The authors would like to thank CST AG, Darmstadt, Germany, for providing CST Studio Suite. Stefan Reese is highly acknowledged for the photographs.

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Authors and Affiliations

  1. Institute for Microwave Engineering and Photonics, Technische Universität Darmstadt, 64283, Darmstadt, Germany

    Roland Reese, Henning Tesmer, Matthias Jost, Ersin Polat, Matthias Nickel, Rolf Jakoby & Holger Maune

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  1. Roland Reese
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  2. Henning Tesmer
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  3. Matthias Jost
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  4. Ersin Polat
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  5. Matthias Nickel
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  6. Rolf Jakoby
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  7. Holger Maune
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Correspondence to Roland Reese.

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Reese, R., Tesmer, H., Jost, M. et al. A Compact Two-dimensional Power Divider for a Dielectric Rod Antenna Array Based on Multimode Interference. J Infrared Milli Terahz Waves 39, 1185–1202 (2018). https://doi.org/10.1007/s10762-018-0535-x

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  • DOI: https://doi.org/10.1007/s10762-018-0535-x

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