Electromagnetic Topology Analysis to Coupling Wires Enclosed in Cavities with Apertures

Abstract

We use both electromagnetic topology (EMT) and the Baum-Liu-Tesche (BLT) equation to analyze a cavity model with an aperture. More precisely, we combine the aperture coupling theory and EMT to study the issues of the electromagnetic field penetration through apertures into a cavity and the coupling to a two-wire transmission line in it. We employ the equivalence principle to establish the equivalent source on the aperture. Then, we obtain the semi analytic solutions of the load response of the two-wire line in the cavity based on the Baum-Liu-Tesche (BLT) equation. In addition, based on the Agrawal model, we give the coupling current distribution at two loads for a two-wire line in the cavity. Finally, we present some numerical results to demonstrate the semi-analytic approach of this paper. In fact, these numerical results on the electric field shielding (EFS) of a rectangular cavity with an aperture agree well with the experimental results in the literature. Furthermore, for a two-wire line in the cavity with an aperture the induced current peaks at loads are observed in the frequency range, some of which are associated with the resonance of the aperture, and others correspond to the resonant frequencies of the cavity.

A Study on the Utility of Statistical Power Balance Method for Efficient Electromagnetic Analysis of Large and Complex Structures

“…[5] . 케이블 등을 따라 전달되는 전 도성 잡음 경로에 대해서는 상대적으로 간섭 전달 경로의 파악 및 상호 작용 다이어그램의 작성이 용 이하여 다중 전송선 [6] , 꼬임 케이블 [7] , 비선형 부하 [8] 등의 [9], [10] . 본 논문에서는 대형 구조에서의 복사성 전자파 분포의 빠르고도 효율적인 해석을 위한 하나의 방법 으로서 통계적인 분포에 기반을 둔 전력 균형 방법 (Power Balance Method: PWB)에 대해 다루고, 그 유 용성을 고찰하고자 한다.…”

Analytical Formulation for Electromagnetic Leakage Field to Transmission Line Coupling through Covered Apertures of Multiple Enclosures

“…The electromagnetic field coupling with wires, PCBs, and other objects located in an enclosure through apertures has become an important issue in recent years [1][2][3]. In particular, the electromagnetic field coupling with wires, an indispensable part of electronic systems used for circuital connection and signal transmission, has attracted much more attention in circuit related EMI problems [4][5][6][7].…”

“…As a result, analytical approaches [6][7][8][9][10][11], which provide a much faster and more convenient technique of calculation and analysis of the effect of different parameters on the voltage and current induced on the wires, have been especially used in predicting the electromagnetic field coupling with wires. In the previous studies, Li et al [6] have implemented the electromagnetic topology theory for electromagnetic field coupling with a two-conductor transmission line (TL) in a rectangular enclosure with apertures illuminated by an external plane wave. Based on the equivalent lumped-pi circuit model, the electromagnetic field coupling with a single-conductor TL in a rectangular enclosure excited by an internal electric dipole is investigated in [7].…”

“…The ILCM technique has also been used to study the electromagnetic coupling between lines and loops inside a rectangular enclosure [10,11]. References [6][7][8][9][10][11] concentrate on the field problems of a single enclosure. However, there are few studies for the electromagnetic field coupling with TLs in multiple apertured enclosures.…”