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Concept for the implementation of very high directivity and decade bandwidth in compact microstrip directional couplers

Alt, Alexander ORCID: https://orcid.org/0000-0002-7621-4940, Schwerg, Nikolai, Wangler, Christian and Gruner, Daniel 2017. Concept for the implementation of very high directivity and decade bandwidth in compact microstrip directional couplers. Presented at: 2016 46th European Microwave Conference (EuMC), London, UK, 3-7 October 2017. 2016 46th European Microwave Conference (EuMC). IEEE, pp. 210-213. 10.1109/EuMC.2016.7824315

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Abstract

A concept to induce a very high directivity and a flat coupling over a large bandwidth in compact microstrip directional couplers is presented. By introducing lumped element based compensation networks at the isolated and coupled port of a simple electrically short directional coupler, a very high directivity and a constant coupling over enormous bandwidths up to one decade can be achieved. With a design focusing on flat coupling, a high power directional coupler with a coupling length of only 50 mm, less then λ/25 at the middle of the band, was shown to have a coupling in the range of 52.11 dB ± 0.05 dB from 37.4 MHz to 200 MHz. In a further design step with focus on directivity and coupling flatness at the same, the coupling stayed within 55.25 dB ± 0.35 dB from 22 MHz to 164 MHz with a directivity of greater than 50 dB (30 dB) from 35 MHz to 84 MHz (20 MHz to 187 MHz).

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Publisher: IEEE
ISBN: 978-2-87487-043-9
Date of First Compliant Deposit: 31 July 2017
Last Modified: 05 Jan 2024 08:27
URI: https://orca.cardiff.ac.uk/id/eprint/103119

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