This article presents a simple wideband rectangular antenna in foldable and non-foldable (printed circuit board (PCB)) structures for Internet of Things (IoT) applications. Both are simple structures with two similar rectangular metal planes which cover multiple frequency bands such as GPS, WCDMA/LTE, and 2.4 GHz industrial, scientific, and medical (ISM) bands. This wideband antenna is suitable to integrate into the short- and long-range wireless applications such as the short-range 2.4 GHz ISM band and standard cellular bands. This lowers the overall size of the product as well as the cost in the applications. In this article, the configuration and operation principle are presented as well as its trade-offs on the design parameters. Simulated and experimental results of foldable and non-foldable (PCB) structures show that the antenna is suited for IoT applications.

In this paper, a transmission line is proposed to propagate both audio and microwave signals. The input and output chokes at audio input and output paths isolate the microwave signal transmitting to audio input and output respectively. The proposed transmission line shows that audio and microwave signals can be mixed together in the same line, which reduces the size of print circuit board (PCB). This proposed transmission-line circuit can be designed in any transmission structures and it shows that the overall result is the same as individual result.

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