access icon free Simple inverted-F antenna based on independent control of resonant frequency for LTE/wireless wide area network applications

In this study, a simple inverted-F antenna (IFA) that can independently tune resonant frequency is proposed. The proposed antenna covers the hexa-band (long term evolution/wireless wide area network (LTE700/WWAN)) for mobile handset applications. The proposed structure consists of four radiating branches. Each branch operates as an IFA and has a resonant length of quarter-wavelength at the fundamental frequency. One remarkable feature of the proposed antenna is that all four resonant frequencies can be tuned independently without affecting the other resonant frequencies. The independent resonant control is explained through analysis based on parameter study and simulated electric field distribution. The occupied antenna volume of the proposed design is 50 × 15 × 3 mm3, which is appropriate for the smart phone applications. A prototype of the proposed antenna is fabricated and measured, and the obtained results, including the reflection coefficient, efficiency and gain, are presented. A stable and omni-directional radiation pattern with a reasonable gain has been observed over the operating bandwidth.

Inspec keywords: wide area networks; smart phones; omnidirectional antennas; frequency control; antenna radiation patterns; Long Term Evolution

Other keywords: electric fleld distribution; inverted-F antenna stable radiation pattern; resonant frequency independent tuning control; IFA omnidirectional radiation pattern; mobile handset application; smart phone application; wireless wide area network application; reflection coefflcient; LTE application

Subjects: Mobile radio systems; Computer communications; Other computer networks; Single antennas

References

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      • 22. Lee, H.-S., Lee, K.-H., Han, M.-S., Lee, J.-K., Yoon, J.-H., Kim, H.-T.: ‘A quad-band internal antenna having independent controllability of low/high resonant frequencies’. Proc. of the 36th European Microwave Conf., 2006, pp. 831834.
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http://iet.metastore.ingenta.com/content/journals/10.1049/iet-map.2014.0197
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