Abstract
Schroeder 방식의 QRD(quadratic Residue Diffuser) 구조에서 더욱 진화한 경사진 QRD를 사용하여 전자파 잔향실(reverberation chamber) 내의 전자기장 균일도를 향상시켰다. FDTD(Finite-Difference Time-Domain) 수치 해석방식을 이용하여 <TEX>$2{\sim}3GHz$</TEX> 대역에서의 전자파 잔향실 내의 전자기장의 분포를 해석하였다. QRD 경사 각도의 조절과 경사 방향을 전환하여 전자파 잔향실 내부의 시험 공간에서의 <TEX>E_x,\;E_y,\;E_z$</TEX> 샘플의 표준편차 및 공차가 각각 0.3 dB, 2.5 dB 향상되고 전체적으로 전자기장 분포의 균일성이 확보되었다. The field uniformity inside the reverberation chamber has been improved using sets of quadratic residue diffuser (QRD). The electromagnetic field inside the reverberation chamber with the dimension of <TEX>$100{\times}80{\times}80cm$</TEX> has been analyzed by the finite-difference time-domain(FDTD) method. The calculated fields in a <TEX>$40{\times}30{\times}30cm$</TEX> test volume have been sampled to obtain a standard deviation and field uniformity. Results show that the standard deviation of the calculated field and uniformity have been improved by varying angles and orientation of the inclined surfaces of the QRDs installed inside the reverberation chamber.
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