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A significant advancement in antenna design, with implications for 6th generation (6G) networks, has been reported by researchers from the City University of Hong Kong (CityUHK). A study, published in Nature Communications, describes a new metasurface antenna capable of generating and controlling multiple frequency components simultaneously through software, potentially revolutionising wireless communication systems.

Led by Professor Chan Chi-hou, Chair Professor in the Department of Electrical Engineering at CityUHK, the research introduces a concept referred to as a “synthetic moving-envelope” metasurface. The design enables antennas to independently manage arbitrary harmonic frequencies and wave properties, an achievement not previously demonstrated. Reports suggest this innovation may enhance data transmission capacity and provide advanced functionality for real-time imaging, wireless power transfer, and secure communication systems essential for future networks.

Key Features and Applications

According to the study, the technology allows for the simultaneous transmission of multiple signals in different directions, increasing channel efficiency. As per the research team, this capability holds particular importance for 6G networks, where integration of communication and sensing technologies is crucial.

The antenna’s ability to achieve spectral control via a simple coding strategy was highlighted by Professor Chan, who also serves as Director of the State Key Laboratory of Terahertz and Millimetre Waves. Professor Wu Gengbo, another researcher involved in the project, indicated that the system’s 1-bit coding approach and sideband-proof design offer compatibility with on-chip integration. Potential uses could extend beyond communications to include cognitive radar, integrated photonics, and even quantum science.

A Step Towards 6G Networks

As detailed in the report, this development represents a departure from conventional fixed-parameter antennas, opening possibilities for more dynamic and efficient systems. While practical applications remain under exploration, the metasurface antenna’s innovative approach is seen as a critical step towards enabling the advanced communication demands of 6G.

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Science

This Is When Axiom-4 Mission Carrying Shubhashu Shukla Will Be Launched

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13 hours ago

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June 16, 2025

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This Is When Axiom-4 Mission Carrying Shubhashu Shukla Will Be Launched

NASA, Axiom Space, and SpaceX are targeting no earlier than June 19 for the fourth private astronaut mission to the International Space Station. The Axiom Mission 4 launch was postponed from June 12 as the agency continued evaluating repairs made to a recent leak on the ISS. The small leaks, located in the Zvezda service module’s aft section, had been under observation for years. Now, following a recent repair, the pressure in the module’s transfer tunnel has remained stable, indicating either successful sealing of leaks or compensatory airflow from other station compartments.

NASA Targets June 19 for Axiom-4 Launch as ISS Pressure Holds and Falcon 9 Passes Final Tests

As per a NASA update, while the stable pressure offers promise, teams are still evaluating whether it reflects a successful seal or airflow leakage across the hatch from the main station. Monitoring pressure changes over time is expected to provide clearer insights. Adjustments in launch schedules are considered routine by NASA and its international partners, particularly when onboard station operations require urgent prioritisation.

Progress on the evaluation front has allowed the review of new launch windows. The earlier hold was further compounded by a liquid oxygen leak discovered during post-static fire inspections of the SpaceX Falcon 9 rocket. SpaceX successfully performed a wet dress rehearsal after repairs, validating that the rocket is good to go for launch from the Kennedy Space Centre‘s Launch Complex 39A.

The mission will be commanded by Peggy Whitson, an experienced NASA astronaut who is Axiom Space’s director of human spaceflight. India’s Shubhanshu Shukla of ISRO will pilot the mission. The mission specialists include Polish ESA astronaut Sławosz Uznański-Wiśniewski and Hungarian astronaut Tibor Kapu. The mission represents an extension of Axiom’s increasingly prominent position in commercial human spaceflight.

The new launch date for the Axiom-4 mission is currently targeted for June 19, 2025. SpaceX has verified that all of the technical issues that caused the first delay have been resolved. Further updates will be released as NASA and its partners finalise operational assessments, as shared by Union Minister Dr. Jitendra Singh in an official statement.

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Earth’s Oceans Enter Danger Zone Due to Rising Acidification, New Study Warns

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June 15, 2025

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Earth’s Oceans Enter Danger Zone Due to Rising Acidification, New Study Warns

The oceans of Earth are in worse condition than it was, thought, said the scientists. This is because of the increased acidity levels that led the sea to enter the danger zone five years ago. As per the new study, oceans are more acidic by releasing carbon dioxide from industrial activities such as fossil fuel burning. This acidification of the oceans damages marine life and the ecosystem, in turn threatening the coastal human communities that are dependent on healthy waters for their life.

Oceans May Have Crossed the Danger Zone in 2020

In the study published on Monday, June 9, 2025, in the journal Global Change Biology, researchers have found that acidification is highly advanced tha it was considered in the previous years. Our oceans might have entered the danger zone in the year 2020. Previous research suggested that the oceans of Earth were approaching a danger zone for ocean acidification.

How Ocean Acidification Happens

Ocean acidification is driven by the absorption of ocean of excess CO2 into the ocean, which is rapidly contributing to the global crisis. CO2 dissolves in seawater, forming carbonic acid, lowering pH levels and invading the vital carbonate ions. This threatens the species in the water, such as corals and shellfish, which depend on calcium carbonate to build their skeletons and shells.

The Planetary Boundary May Be Breached

Recent research depicts that the ocean acidification levels may now be breached, crossing the previous estimate of a 19% aragonite decline from the previous industrial levels. Scientists are alarmed that this change could destabilise the ecosystems of marine and, in turn, the coastal economies. This is a ticking bomb with socioeconomic and environmental consequences.

Global Consequences of Acidification

The recent findings suggest that scientists have feared in the past. Ocean acidification has reached dangerous levels, exceeding the limit that is needed to maintain a healthy and stable environment. As critical habitats degrade, the rippling effects are expected to cause harm to biodiversity, impact food security for many of the people who depend on the oceans for their livelihood.

For the latest tech news and reviews, follow Gadgets 360 on X, Facebook, WhatsApp, Threads and Google News. For the latest videos on gadgets and tech, subscribe to our YouTube channel. If you want to know everything about top influencers, follow our in-house Who’sThat360 on Instagram and YouTube.


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NASA Chandra Spots Distant X-Ray Jet; Telescope Faces Major Budget Cuts

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June 15, 2025

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NASA Chandra Spots Distant X-Ray Jet; Telescope Faces Major Budget Cuts

NASA’s Chandra X-ray Observatory has detected an enormous X-ray jet from quasar J1610+1811, observed at a distance of about 11.6 billion light-years (roughly 3 billion years after the Big Bang). The jet spans over 300,000 light-years and carries particles moving at roughly 92–98% of the speed of light. It is visible in X-rays because high-energy electrons in the jet collide with the much denser cosmic microwave background at that epoch, boosting microwave photons into X-ray energies. These results were presented at the 246th AAS meeting and accepted for publication in The Astrophysical Journal.

Discovery of the Distant X-ray Jet

According to the study, Chandra’s high-resolution X-ray imaging, combined with radio data, allowed the team to isolate the jet at such a great distance. At the quasar’s distance (about 3 billion years after the Big Bang), the cosmic microwave background was much denser. As a result, relativistic electrons in the jet efficiently scatter CMB photons to X-ray energies. From the multiwavelength data the researchers infer that the jet’s particles are moving at roughly 0.92–0.98 c. Such near-light-speed outflows are among the fastest known.

These powerful jets carry enormous energy into intergalactic space and provide a unique probe of how black holes influenced their surroundings during the universe’s early “cosmic noon” era.

Chandra’s Future at Risk

However, the Chandra mission now faces possible defunding: NASA’s proposed budget calls for drastic cuts to its operating funds. For nearly 25 years, Chandra has been a cornerstone of X-ray astronomy, so its loss would constitute a major setback. The SaveChandra campaign warns that losing Chandra would be an “extinction-level event” for U.S. X-ray astronomy. Scientists warn that ending Chandra prematurely would cripple X-ray science.

Andrew Fabian commented Science magazine, “I’m horrified by the prospect of Chandra being shut down prematurely”. Elisa Costantini added in an interview with Science that if cuts proceed, “you will lose a whole generation ” and it will leave “a hole in our knowledge” of high-energy astrophysics. Without Chandra’s capabilities, many studies of the energetic universe would no longer be possible.

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