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This paper presents a reliable and efficient analytical model to calculate the shielding effectiveness (SE) of a rectangular enclosure with wire penetration under plane wave illumination over frequency range of 0 to 2.5GHz. The wire is equivalent to monopole antenna, and the four-element lumped-parameter equivalent circuit for monopole antenna is established to represent the coupling process between electric field and the wire. Based on dynamic Green function, the approximate solution of the electric field distribution in the enclosure excited by the internal wire is derived, and Bethe's theory is used to calculate the approximate solution of the electric field distribution in the enclosure excited by the aperture when the aperture size is not negligible. Several cases are presented to verify the validity of the model. The effects of the length of the wire inside and outside the enclosure, wire penetration and observation point position as well as incident direction of plane wave on the SE are discussed in detail. Simulation result of the proposed model are in good agreement with that of the transmission line matrix (TLM) method. [ABSTRACT FROM AUTHOR]

This paper develops a hybrid model based on the combination of full-wave simulation method and circuit model analytic algorithm, which can predict the shielding effectiveness of a perforated rectangular enclosure irradiated by a planewave with arbitrary incident and polarization direction. In order to take the effect of the electromagnetic losses of the aperture into account, the full-wave simulation method is adopted to calculate the coupling voltage of the aperture. The circular aperture or rectangular aperture with arbitrary length-width ratio can be positioned anywhere in the front panel of the enclosure. Taking the effect of the thickness into account, we establish the equivalent circuit model of the perforated enclosure with aperture coupling voltage as an equivalent voltage source. Then, the TEmn and TMmn modes of the coupling electric field at arbitrary observation point within the enclosure are calculated based on waveguide theory. Simulation results of the hybrid model are in good agreement with those of transmission line matrix method within the frequency range of 0-3 GHz. Solution times using the hybrid model are far less than those required by pure numerical methods. [ABSTRACT FROM AUTHOR]

In this paper, we consider a shared-antenna full-duplex massive MU-MIMO system and prove that the self-interference (SI) at the base station (BS) can be suppressed, though the direct-path SI exists and the signal/SI channel is imperfectly estimated. The BS is assumed to employ zero-forcing (ZF) or maximal-ratio transmission/maximal-ratio combining (MRT/MRC) method to linearly process signals. We propose a precoded SI channel training scheme by employing orthogonal sequences and downlink precoding, so the SI channel can be estimated like the signal channel with a much lower dimension. Based on the channel estimation, we further analyze the SI suppression by combining the SI removal and the large-scale antenna linear processing (LALP) method. Numerical results show that an additional 36 dB SI can be suppressed by combining the SI removal and the LALP suppression. We derive the tight closed-form lower bounds of the achievable rates for the combined suppression. Finally, we maximize the system spectral efficiency and energy efficiency based on the simulation and closed-form approximations. [ABSTRACT FROM AUTHOR]

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