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A H-band vector modulator MMIC for phase-shifting applications

: Müller, D.; Tessmann, A.; Leuther, A.; Zwick, T.; Kallfass, I.


Papapolymerou, J. (Ed.) ; Institute of Electrical and Electronics Engineers -IEEE-:
IEEE MTT-S International Microwave Symposium, IMS 2015 : Phoenix, Arizona, USA, 17 - 22 May 2015
Piscataway, NJ: IEEE, 2015
ISBN: 978-1-4799-8275-2
ISBN: 978-1-4799-8276-9
International Microwave Symposium (IMS) <2015, Phoenix/Ariz.>
Fraunhofer IAF ()
MMIC; phase shifter; vector modulator; H-band; GaAs; MHEMT

This paper presents a H-Band vector modulator which is optimized for phase shifting applications. The vector modulator is realized using a compact topology based on power dividers, baluns and variable gain amplifiers and shows state-of-the- art performance for frequencies between 235 and 270GHz with very low RMS gain and phase errors. In this frequency range the full 360° phase control range is achieved with less than 6:5 dB insertion loss. The MMIC was fabricated using a 50nm GaAs mHEMT technology and the resulting chip-size is only 1:25mm x 1:00 mm.