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An ultra-wideband MMIC balanced frequency doubler using line-unified HEMTs

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2 Author(s)
Takenaka, Tsutomu ; ATR Opt. & Radio Commun. Res. Lab., Kyoto, Japan ; Ogawa, H.

A very small, ultrawideband, MMIC balanced frequency doubler that uses line-unified HEMT configurations is proposed. A chip size of 1.0 mm×0.9 mm is achieved with a conversion loss of 8-10 dB in the 4-40-GHz output harmonics frequency range and fundamental frequency signal isolation of better than 21 dB above the input fundamental frequency of 7 GHz. Circuit parameters are optimized in a novel and simple prediction using an equation derived from the HEMT's DC characteristic and a linear-state CAD software package. The doubler has promise for realizing miniaturized, wideband MMIC transmitters/receivers

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:40 ,  Issue: 10 )