실내 무선측위를 위한 IR-UWB 안테나 설계

Abstract

The IR-UWB radar is an immerging technology to improve the existing indoor wireless positioning systems by allowing accurate location tracking within cm range in low-cost and low-power consumption. In this paper proposes antennas for IR-UWB radars and applies them to NVA-R661 modules to verify their usefulness. The proposed antenna is a quasi-Yagi antenna and tapered slot antenna. The quasi-Yagi antenna is fabricated on a TRF-45 substrate with a dielectric constant of 4.5, a loss tangent of 0.0035, and a thickness 0.61 mm. The proposed quasi-Yagi antenna satisfies VSWR ≤ 2 within 5.03 ∼ 9.39 ㎓ band, achieving a wide impedance bandwidth of 4.36 ㎓. The antenna gain is measured to be 4.91 ㏈i, 5.41 ㏈i, 5.68 ㏈i, 6.46 ㏈i and 5.08 ㏈i in 5, 6, 7, 8 and 9 ㎓ frequency respectively. Tapered slot antenna was fabricated on a TRF-45 substrate with a dielectric constant of 4.5, a loss tangent of 0.0035, and a thickness 1.62 mm. The fabricated tapered slot antenna satisfies VSWR ≤ 2 within 4.45 ∼ 12.03 ㎓ band, achieves a wide bandwidth of 7.58 ㎓. The antenna gain is measured to be 6.76 ㏈i, 7.50 ㏈i, 7.38 ㏈i, 7.59 ㏈i and 8.92 ㏈i in 5, 6, 7, 8 and 9 ㎓ frequency respectively. To verify the practicality of the proposed antenna, signal processing was analyzed in terms of background subtraction, signal attenuation compensation, and detection. The RMSE of the quasi-Yagi antenna is 6.7764 and the RMSE of tapered slot antenna is 6.7474.