광대역 선형 스위프 특성을 갖는 X-밴드

Abstract

Frequency Modulated Continuous Wave (FMCW) radar with a single antenna configuration is used to several application field such as a level sensor, a short distance sensor, a radio wave altimeter and an equipment for collision preventing of vehicles etc. In general, the resolution of the FMCW radar may be mainly depend on linearity of frequency sweep. For a linear frequency sweep, in this paper, we proposed a frequency synthesizer using phase-looked loop (PLL) applicable to X-band FMCW radar.

To design the frequency synthesizer which has a broadband linear sweep from 10 GHz to 11 GHz, we use a PLL IC which operates up to 2.8 GHz, and a prescaler which turns down the frequency from X-band to UHF-band. The measured results show that the linear frequency sweep range is from 10GHz to 11GHz and the output power of the synthesizer over the operating frequency band is minimum 7dBm, and the phase noise is about -80dBc/Hz at 100kHz offset from 11GHz.