A High-Order Model for Fast Estimation of Electromagnetic Absorption Induced by Multiple Transmitters in Portable Devices

In the development of 5G communication systems, multiantenna transmitting architectures and millimeter-wave operating frequency bands are effective ways to improve the communication data rate. In order to estimate the electromagnetic exposure under multiantenna transmitters installed in portable devices working in long-term evolution (LTE) and millimeter-wave bands, this paper generalizes a low-order model to higher orders based on the Fourier series expansion for a fast and accurate evaluation and prediction of electromagnetic absorption (EA) as a function of the phase difference among multiple transmitters. Several numerical and experimental examples are given to demonstrate the effectiveness of the proposed high-order model in multiple LTE, 5G, and millimeter-wave communication bands. With the excellent capability of calculating and predicting EA with a low error, this high-order model can be used to improve the bio-electromagnetic performances of multiantenna portable devices when combined with other communication technologies.

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