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In this paper, the mutual coupling between a mobile device antenna and a closely integrated miniature moving-coil speaker is investigated. The analysis focuses on the speaker radio-frequency harmonic resonance characteristics and the antenna radiation efficiency degradation due to the presence of a speaker. First, antenna structures with simplified speaker models were numerically examined to assess the impacts of speaker harmonic resonance, antenna pattern, speaker location, and coupling mechanisms on antenna radiation performance. Subsequently, highly detailed speaker models based on commercial speaker designs were characterized through simulations and hardware prototyping. The analysis results reveal that the degradation of antenna radiation efficiency is associated with the enhancement of nonradiative energy stored in a conductively or capacitively coupled resonant speaker. Based on the coupling characteristics, practical design guidelines were proposed to achieve cost-effective antenna–speaker coexistence and optimum antenna radiation efficiency even under the most stringent design constraints. [ABSTRACT FROM AUTHOR]

The objective of this study was to analyze whether advanced simulation platforms provide the effectiveness, accuracy, reliability, and efficiency to predict impairment of mobile-phone RF performance under various usage patterns. The investigation was based on the mechanical CAD data of a commercial phone with two alternative antennas. Three significant hand positions were modeled and evaluated with the device against the SAM head. The results demonstrated high reliability and suitability for providing decision rationale for the design of complex high-end multi-band mobile phones. [ABSTRACT FROM AUTHOR]

The objective of this study was to investigate the cost and time effectiveness of virtual prototyping when applied to the optimization of antenna system design for mobile phones, compared to traditional development approaches. For the proposed evaluation, an enhanced commercial FDTD-based electromagnetic simulation platform, powered with GPU hardware acceleration and distributed network parallelization, was applied. Advanced genetic algorithms (GAs) were used to obtain robust antenna designs, targeting a multi-goal optimum within a minimum number of simulations. Various antenna structures, including folded monopoles, planar-inverted F, and folded-inverted-conformal antennas were considered. An optimized structure was developed in less than 24 hours, indicating the superiority of virtual prototyping over traditional design and optimization procedures for reducing costs, improving quality, and, particularly, in reducing development time. [ABSTRACT FROM AUTHOR]