Front End | News Ceramic antenna for wearables, IoT and smart cities markets A
ntenova, the UK-based manufacturer of IoT antennas and GNSS modules, has developed a new ceramic
antenna for the ISM bands. The new antenna is named Silvai, part number SCRI024.
Silvai features a novel trace design that improves reception and extends the range. This ISM ceramic antenna measures a mere 1x0.5x0.5 mm, the area of the antenna trace is 30 x 11.5mm, and it works on PCBs as small as 60x30mm. According to Antenova, Silvai is cost-effective with high efficiency. Average efficiency ranges from 55 per cent on 863–870MHz to 70 per cent on 902–928MHz bands. Silvai is said to use an innovative antenna trace to obtain high efficiency; this extends the range compared to other antennas with lower efficiency.
Silvai is designed to operate with all types of ISM modules such as LoRa, Matter, and other
protocols for Wireless Sensor Networks. Silvai is structurally smaller than any of Antenova’s other ISM antennas but provides improved performance on 868 - 915 MHz bands. It directly targets the increasing desire for smaller and smaller devices in wearable, portable, and handheld devices, such as communication and surveillance monitors, medical alert devices and safety alarms disguised as jewellery. Ceramic antennas are resistant to detuning from nearby materials, therefore it can be worn on the body. Michael Castle, product marketing manager at Antenova, said: “Most ISM applications require long range to extend the coverage area. The innovative antenna trace design of the Silvai antenna results in much longer range than other antennas of similar size, while taking a small area so that a design can be as small as possible.”
www.antenova.com/silvai/ Metal nanoclusters for stable lithium–sulfur batteries L Advanced Interconnection_CIE 210x130 ad template 13/10/2021 11:31 Page 1
ithium–sulfur batteries (LSBs) are said to offer high energy storage potential. However, issues like formation of lithium polysulfides and lithium dendrites lead to capacity loss and raise safety concerns. Now, researchers from Japan and China have developed a graphene separator embedded with platinum-doped gold nanoclusters, which enhance lithium-ion transport and facilitate redox reactions. This is said to address the long-standing issues associated
The demand for efficient energy storage systems is ever increasing, especially due to the recent emergence of intermittent renewable energy and the adoption of electric vehicles. In this regard, lithium– sulfur batteries (LSBs), which can store three to five times more energy than traditional lithium-ion batteries, have emerged as a promising solution. LSBs use lithium as the anode and sulfur
with LSBs, setting the stage for their commercialization.
as the cathode, but this combination poses challenges. One significant issue is the “shuttle effect,” in which intermediate lithium polysulfide (LiPS) species formed during cycling migrate between the anode and cathode, resulting in capacity fading, low life cycle, and poor rate performance. Other problems include the expansion of the sulfur cathode during lithium-ion absorption and the formation of insulating lithium–sulfur species and lithium dendrites during battery operation. While various strategies, such as
cathode composites, electrolyte additives, and solid-state electrolytes, have been employed to address these challenges, they involve trade-offs and considerations that limit further development of LSBs.
Recently, atomically precise metal nanoclusters, aggregates of metal atoms ranging from 1–3 nanometers in size, have received considerable attention in materials research, including on LSBs, owing to their high designability as well as unique geometric and electronic structures. However, while many
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