A balanced reflection type HMIC vector modulator over 34–36GHz based on cold state pHEMTs

Author

Dongquan Sun ; Yanyan Fan ; Jinping Xu ; Shu Jiang

Author_Institution

State Key Lab. of Millimeter Waves, Southeast Univ., Nanjing, China

fYear

2015

fDate

March 30 2015-April 1 2015

Firstpage

1

Lastpage

4

Abstract

A vector modulatorat Ka band consisting of two balanced I/Q bi-phase attenuatorsis presented in this paper. The bi-phase attenuators are of reflection type, in which cold state pHEMTs are employed as tunable impedance loads. Due to the balanced structure, parasitic effects of the pHEMTs are effectively cancelled. A prototype of the vector modulator is fabricated by HMIC technique. The measured dynamic range of amplitude is about 28dB with 360 degree tunable phase. The maximum transmission coefficient is about -8dB while the return loss is better than 15dB at the whole operation band of 34-36GHz.

Keywords

modulators; transistors; HMIC vector modulator; I/Q bi-phase attenuatorsis; balanced reflection; balanced structure; cold state pHEMT; parasitic effects; pseudomorphic high electron mobility transistors; tunable impedance loads; vector modulator; Binary phase shift keying; Frequency modulation; Microwave communication; Optical modulation; Optical reflection; Phase measurement; Q measurement; I/Q; Ka band; balanced structure; pHEMT; reflection type; vector modulator;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Symposium (IWS), 2015 IEEE International

Conference_Location

Shenzhen

Type

conf

DOI

10.1109/IEEE-IWS.2015.7164511

Filename

7164511