**5. Conclusion**

The architecture of the PIFA on PCB with meandering line was shown. The measurement results of return loss and gain performances shown that it has better performances compared to the dielectric antennas as well as without any extra matching components. When only single communication technology is used in IoT product, PIFA is recommended. Using meandering line can reduce the antenna size as well as keeping the performance. PIFA design, therefore, is suitable for ISM band and other IoT applications. In the product utilizing numbers of communication technologies at same times, one wideband antenna integrated in the product is more suitable. Both foldable and non-foldable wideband structures, therefore, were proposed and fabricated for their different uses in IoT applications. Both measurement results of two structures show more than 65% in bandwidth. Their operating frequency covers IoT applications in GPS, the 2.4 GHz ISM band, and the common 3GPP WCDMA and LTE bands. And the foldable structure has advantage of wearable applications.

During the design process, the type of antenna is firstly confirmed and then the key parameters such as frequency and size need to be determined. Simulation software and measurement equipment are important tools to verify its performance and further design iterations may be required for fine-tuning the performance.

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**Author details**

Man Ho Tsoi and Steve W.Y. Mung\*

provided the original work is properly cited.

The Hong Kong Polytechnic University, Hong Kong

\*Address all correspondence to: mungwaiyin@hotmail.com

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

*Planar Antenna Design for Internet of Things Applications*

*DOI: http://dx.doi.org/10.5772/intechopen.92456*
