Resonator-based analysis of the combination of mobile handset antenna and chassis

摘要: The performance of the mobile phone handset antenna-chassis combination is analyzed based on an approximate decomposition waves structure into two resonant wavemodes: antenna-element wavemode and chassis wavemode. A double resonator equivalent circuit model presented used to estimate impedance bandwidth respective distributions radiation losses with typical parameter values at 900 1800 MHz. It noticed that MHz, antenna element represent typically less than 10% total power. Thus, works mainly as a matching element, which couples low-Q chassis. At contribution larger. By enhancing coupling by tuning resonance, it possible obtain over 50% (6 dB return loss) both results given study are fully supported those three-dimensional phone-model simulations, including calculation SAR efficiency values. In prototyping, 6 5.5% was obtained 980 MHz nonradiating volume 1.6 cm/sup 3/ 120 mm long