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Machine-to-Machine (M2M) communications are increasingly important as an enabler for emerging Internet of Things (IoT) applications. In this paper, two types of UHF antennas for M2M communications are summarized. Both types of the antennas operate around 480MHz and are low profile with a size of 0.1λ. One type is based on magneto-dielectric material, and the other is based on a novel structure design...
In this paper, a compact tunable microstrip patch antenna with Co2Z hexaferrite substrate (µr=15, εr=12) that resonates on 360 MHz has been designed and fabricated, of which the frequency can be tuned by ∼2.5/1. Compared with an identically sized patch antenna with dielectric material Rogers TMM13i (µr=1, εr=12) operating at 1120 MHz, the magnetic antenna on the Co2Z substrate exhibited a high bandwidth...
This paper presents a miniaturized antenna for ultra high frequency (UHF) Machine-to-Machine (M2M) communications. Basic structure of the antenna is a printed monopole fed through a microstrip line. A magneto-dielectric material MF114 is used as superstrate to achieve antenna miniaturization as well as increase its bandwidth. This antenna works at 480MHz, and has 8.3MHz bandwidth. Dimension of its...
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