A low cost X-band HMIC vector modulator

Author

Wang, Ling ; Tang, Xiao-Hong ; Xiao, Fei ; Liu, Ren-Hou

Author_Institution

Sch. of Electr. Eng., China Univ. of Electron. Sci. & Technol., Chengdu, China

Volume

1

fYear

2005

fDate

4-7 Dec. 2005

Abstract

A low cost X-band HMIC (hybrid microwave integrated circuit) vector modulator used in a 9-10GHz phase controlled array radar system is designed by using unpowered FETs as the control elements. Due to the effect of FET parasitic parameters, bi-phase modulators are not ideal 180° phase difference, and thus the dynamic range of the HMIC vector modulator is reduced. In order to widen the dynamic range, the characteristic impedance of the bi-phase modulator has increased to 70 ohm from 50 ohm. The final measurement results show that the analogue control of the HMIC vector modulator extends over a range of 14dB for amplitude and over 0-360 degrees for phase at the frequency of 9.6GHz, and that the mean square errors of the phase are lower than ±5° for a 3.1% instantaneous bandwidth wherever in 9-10GHz.

Keywords

hybrid integrated circuits; mean square error methods; microwave field effect transistors; microwave integrated circuits; modulators; phased array radar; 9 to 10 GHz; FET parasitic parameters; HMIC vector modulator; X-band vector modulator; analogue control; bi-phase modulator; hybrid microwave integrated circuit; mean square errors; phase controlled array radar system; unpowered FET; Control systems; Costs; Dynamic range; Hybrid integrated circuits; Microwave FET integrated circuits; Microwave antenna arrays; Microwave integrated circuits; Phase modulation; Phased arrays; Radar;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings

Print_ISBN

0-7803-9433-X

Type

conf

DOI

10.1109/APMC.2005.1606293

Filename

1606293