CAJ | 학술논문

针对传统宏元胞法时效性低通用性弱的缺陷，提出了一种改进的宏元胞法，即将相移常数的多值问题转化为对同一周期结构相位解卷绕起始频点的判定问题，如此可方便地提取出唯一精确的相移常数。由于新方法严格考量了元胞间电磁场的互耦效应，仅需一次仿真或实测便可计算出元胞间存在任意耦合强度的一维人工周期传输线的色散和Bloch阻抗性能。运用新方法提取了经典的非平衡态和平衡态互易非对称微带复合左右手传输线的色散特性，并与传统的本征模式法、解卷绕法和单元胞法的提取结果进行了对比。进一步利用改进宏元胞法和解卷绕法的提取结果分别反演出微带复合左右手传输线的 S参数，基于改进宏元胞法解的 S参数与全波仿真S参数之间良好的一致性证实了新方法的精确性。
침대전통굉원포법시효성저통용성약적결함，제출료일충개진적굉원포법，즉장상이상수적다치문제전화위대동일주기결구상위해권요기시빈점적판정문제，여차가방편지제취출유일정학적상이상수。유우신방법엄격고량료원포간전자장적호우효응，부수일차방진혹실측편가계산출원포간존재임의우합강도적일유인공주기전수선적색산화Bloch조항성능。운용신방법제취료경전적비평형태화평형태호역비대칭미대복합좌우수전수선적색산특성，병여전통적본정모식법、해권요법화단원포법적제취결과진행료대비。진일보이용개진굉원포법화해권요법적제취결과분별반연출미대복합좌우수전수선적 S삼수，기우개진굉원포법해적 S삼수여전파방진S삼수지간량호적일치성증실료신방법적정학성。
In view of the poor time-efficiency and generality of the traditional macro cell method ,an improved macro cell method(IMCM)is proposed ,capable of extracting the dispersive properties of any 1D reciprocal artificial periodic transmission line (APTL )with finite periodicity .Key to the IMCM lies in that the multiple-root problem of the initially extracted phase shift constant is transferred to the problem of judging the starting frequency of the phase unwrapping ,making it easy to determine the uniquely correct phase shift constant .Since the electromagnetic coupling effects among unit cells of a periodic structure are rigorously consid-ered in the IMCM ,both the dispersion and Bloch impedance characteristics can be accurately and effectively extracted with simula-tion or measurement only once ,however strong the coupling intensity is .As examples ,the proposed IMCM is applied to extract the dispersive properties of the classical reciprocal asymmetric microstrip composite right-/left-handed transmission lines (CRLHTLs )in the unbalanced and balanced states ,and the extraction results are compared to those from the traditional eigenmode method ,unwrap-ping method(UPM)and single cell method .Furthermore ,S parameters of the microstrip CRLHTL are retrieved using the extraction results of the IMCM and the UPM ,and the former S parameters coincide perfectly with the full-wave results ,confirming the accura-cy of the IMCM .