W-band power amplifier using broadband impedance-transforming coupled line couplers
| Autor: | Sang-Ho Lee, Youngwoo Kwon, Jungsik Kim, Jinho Jeong, Hosang Kwon, Wansik Kim, Seokchul Lee |
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| Rok vydání: | 2015 |
| Předmět: |
Engineering
business.industry Amplifier Electrical engineering High-electron-mobility transistor Condensed Matter Physics Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials W band Return loss Insertion loss Power dividers and directional couplers Optoelectronics Electrical and Electronic Engineering business Electrical impedance Monolithic microwave integrated circuit |
| Zdroj: | Microwave and Optical Technology Letters. 57:803-806 |
| ISSN: | 0895-2477 |
| DOI: | 10.1002/mop.28965 |
| Popis: | In this letter, a compact and broadband impedance-transforming 90° hybrid is proposed, where two coupled lines with different characteristic impedances are cascaded to transform 50 to 25 Ω. The designed 50–25 Ω transforming coupler on a GaAs substrate shows a measured insertion loss of 1.1 dB with a return loss of 29.0 dB at 77 GHz. The insertion loss is lower than 2.0 dB in the range from 30 to 97 GHz. The proposed impedance-transforming couplers are used in the design of a W-band balanced power amplifier (PA) with a port impedance of 25 Ω, which allows the compact and broadband design of matching circuits in the PA. The PA fabricated by a 0.15-μm GaAs pHEMT process shows a small-signal gain of 13.3 dB at 79.5 GHz with a 3-dB bandwidth of 21.4% (from 72 to 89 GHz). The measured output power is as high as 16.7 dBm at 75 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:803–806, 2015 |
| Databáze: | OpenAIRE |
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