Power splitter design for two-element antenna array with high mutual coupling

Dept. of Electron. & Telecommun., Bradford Univ., UK
Electronics Letters (Impact Factor: 0.93). 03/2006; 42(4):195 - 196. DOI: 10.1049/el:20064202
Source: IEEE Xplore


Design principles for a power splitter driving a strongly coupled two-element handset array antenna have been derived and studied. Splitter circuits using lumped elements and distributed microstrip elements were designed and tested. The results show reasonable agreement between measured and theoretical results.

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    ABSTRACT: In recent years, electromagnetic dosimetry has been increasingly oriented towards the evaluation of energy deposition in the human body due to an exposure to cellular telephones. In this case of near-field exposure, the significant dosimetric parameters are the specific absorption rate (SAR). This kind of definition causes a technical problem, because the SAR inside a person cannot be measured. Therefore, some indirect way is needed to establish the compliance of a certain device with the basic restrictions. This paper therefore mainly deals with SAR measurement for phased antenna array including some antenna prototypes. Some of these measurements on one other form of the array (using helices) have been only optimised empirically. The measurements use the dosimetric techniques already developed for the compliance testing of mobile telephones. The experimental approach is then described, based on invasive SAR measurements by means of miniaturised E-field probes inside a control phantom. The relative measured SAR values between the uses of phased antenna array to the conventional single antenna handset are presented.
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