A Novel 94-GHz MHMET-Based Diode Mixer Using a 3–dB Tandem Coupler
| Autor: | Yong-Hoh Kim, Hyun-Chang Park, Dong-Sik Ko, Byeong-Ok Lim, Jin-Koo Rhee, Sang-Jin Lee, Dan An, Sam-Dong Kim, Mun-Kyo Lee, Sung-Woon Moon |
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| Rok vydání: | 2008 |
| Předmět: |
Materials science
Tandem business.industry Local oscillator Coplanar waveguide Transistor Electrical engineering High-electron-mobility transistor Condensed Matter Physics law.invention W band law Optoelectronics Electrical and Electronic Engineering business Monolithic microwave integrated circuit Diode |
| Zdroj: | IEEE Microwave and Wireless Components Letters. 18:626-628 |
| ISSN: | 1531-1309 |
| Popis: | We report a high-performance 94-GHz monolithic millimeter-wave integrated-circuit diode mixer using metamorphic high-electron mobility transistor (MHEMT) diodes and a coplanar waveguide tandem coupler. A novel single-balanced structure of diode mixer is proposed in this paper, where a 3-dB tandem coupler with two sections of parallel-coupled line and air-bridge crossover structures are used for wide frequency operation. The fabricated mixer exhibits excellent local oscillator-radio-frequency (LO-RF) isolation, greater than 30 dB, in the 5-GHz bandwidth of 91-96 GHz. A good conversion loss of 7.4 dB is measured at 94 GHz. The proposed MHEMT-based diode mixer shows superior LO-RF isolation and conversion loss to those of the W-band mixers reported to date. |
| Databáze: | OpenAIRE |
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