Hybrid balanced frequency doubler up-converting from 2.45 to 4.9 GHz using packaged GaN HEMTs and a Moore space-filling coupler design approach

Morales Fernandez, Ainhoa, Fernandez Barciela, Monica, Martin Rodriguez, Fernando and Tasker, Paul ORCID: https://orcid.org/0000-0002-6760-7830 2025. Hybrid balanced frequency doubler up-converting from 2.45 to 4.9 GHz using packaged GaN HEMTs and a Moore space-filling coupler design approach. International Journal of Microwave and Wireless Technologies 10.1017/s1759078725101955

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Abstract

A hybrid Balanced Frequency Doubler working up-converting from 2.45 to 4.9 GHz using packaged GaN HEMTs and with no amplification stage, was designed and its performance validated with measurements. The design procedure is detailed, including a brief study of the HEMT optimum bias point. Moore space filling curves are used in the design of the input hybrid coupler, to reduce its size at the fundamental frequency. A maximum measured conversion gain of 11.5 dB with a second harmonic output power of 26.3 dBm was obtained, while fundamental and third harmonic suppression exceeds 40 dBc.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Schools > Engineering
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/4.0, Type: open-access
Publisher:	Cambridge University Press
ISSN:	1759-0787
Date of First Compliant Deposit:	1 September 2025
Date of Acceptance:	20 July 2025
Last Modified:	01 Sep 2025 15:00
URI:	https://orca.cardiff.ac.uk/id/eprint/180805

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