期刊
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
卷 11, 期 6, 页码 712-715出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TTHZ.2021.3105580
关键词
Low-noise amplifiers (LNAs); perfect magnetic conductor (PMC) packaging; microwave amplifiers; microwave integrated circuits; millimeter wave devices; periodic structures; waveguide package
资金
- CONICYT-PFCHA/Doctorado Nacional/2019 [21190632]
- Chilean National Commission for Scientific and Technological Research (CONICYT-ANID) through its Grants Basal [AFB-170002]
- Fondecyt [1180700]
This letter presents a scalable metasurface as a solution for unwanted oscillations in packaging large-width microwave integrated circuits, successfully implemented in a compact W-band receiver to increase isolation between components and eliminate oscillation issues.
When packaging large-width microwave integrated circuits, care has to be taken to avoid structures that could sustain unwanted oscillations. Unfortunately, this situation may not be attainable since large holding cavities are prone to support parasitic waveguide modes that could produce a feedback loop which, in turn, is especially dangerous in high-gain components with poor match with subsequent elements. This letter presents an scalable metasurface, implemented as a gap-waveguide perfect magnetic conductor, suitable to overcome this problem in millimeter- and submillimeter-band receivers. The proposed solution was integrated into a compact W-band (75-110 GHz) receiver where a large chip-width amplifier was placed near a mixer, thus generating oscillations at high-gain levels compromising its operation at some frequencies. The metasurface was incorporated at the top of the amplifier's cavity where it did not only suppressed completely the oscillation, but also increased isolation between components. As a result, the receiver became fully operational as attested by measurements of its noise temperature at the compromised frequencies.
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