24 GHz circularly polarized Doppler radar with a single antenna

Author

Kim, Jeong-Geun ; Sim, Sang-Hoon ; Cheon, Sanghoon ; Hong, Songcheol

Author_Institution

Dept EECS, Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea

Volume

2

fYear

2005

fDate

4-6 Oct. 2005

Abstract

24 GHz circularly polarized Doppler front-end with a single antenna is developed. The radar system is composed of 24 GHz circularly polarized Doppler radar module, signal conditioning block, DAQ unit, and signal processing program. 24 GHz Doppler radar receiver front-end IC which is comprised of 3-stage LNA, single-ended mixer, and Lange coupler is fabricated with commercial InGaP/GaAs HBT technology. To reduce the chip size and suppress self-mixing, single-ended mixer which uses Tx leakage as a LO signal of the mixer is used. The operation of the developed radar front-end is demonstrated by measuring human vital signal. Compact size and high sensitivity can be achieved at the same time with the circularly polarized Doppler radar with a single antenna.

Keywords

Doppler radar; III-V semiconductors; gallium arsenide; gallium compounds; indium compounds; millimetre wave antennas; 24 GHz; Doppler radar receiver front-end IC; HBT technology; InGaP-GaAs; LNA; Lange coupler; human vital signal; radar system; sensitivity; single antenna; single-ended mixer; Antenna measurements; Data acquisition; Doppler radar; Gallium arsenide; Heterojunction bipolar transistors; Polarization; Radar antennas; Radar measurements; Radar signal processing; Signal processing;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2005 European

Print_ISBN

2-9600551-2-8

Type

conf

DOI

10.1109/EUMC.2005.1610194

Filename

1610194