Jakarta, INTI – In the connected digital era, wireless signal quality is a key determinant of smooth communication and access to information. However, challenges arise when tall buildings in big cities block signals, causing interference or even blank spots. In response to this problem, the National Research and Innovation Agency (BRIN) is developing a signal reflector to strengthen wireless networks, especially at the 3.5 GHz frequency which is widely used in modern communication technologies such as 5G.
Practical and Affordable Solution for Big Cities
According to Taufiqqurrachman, a BRIN researcher involved in the project, reflectors are a more economical alternative solution to the construction of BTS (Base Transceiver Station) towers, which require a large amount of land and money. "These reflectors are small and can be installed on the walls of buildings or city poles. Its function is to reflect the signal towards users who are blocked by buildings," he explained when interviewed in Bandung on Wednesday (May 28, 2025).
Testing Two Materials: FR4 vs F4BMX220
In this research, Taufiq designed a circular reflector using two different substrate materials: FR4 and F4BMX220. Both were simulation tested to determine their performance in reflecting signals, absorbing power, and how wide their frequency coverage (bandwidth) is, including when the angle of incidence of the signal changes.
The results show that the F4BMX220 material is superior to FR4. Despite its narrower bandwidth, the reflector with this material is capable of reflecting signals with high power and remains stable up to an angle of 60 degrees. This capability is very suitable for use in densely built environments such as large cities.
The Importance of Reflectors in 5G Communication
The 3.5 GHz frequency signals used in this research are an important part of 5G networks. However, such high frequencies are more susceptible to physical obstacles such as walls and concrete. The reflector serves to divert the signal so that it can still reach users even if it is blocked by buildings.
"These electromagnetic waves are easily blocked by solid objects. With a reflector, the signal can be redirected so that it can still be accessed by users behind barriers," Taufiq added.
Solutions for Future Smart Cities
This reflector innovation opens up new opportunities to strengthen wireless networks without the need to build large infrastructure. BRIN believes that this technology is very suitable for the smart city concept, as it is efficient, cost-effective, and easy to install in various urban areas.
Conclusion
BRIN's innovative signal reflector is a smart solution to signal interference in dense urban areas. With a simple design, low cost, and high effectiveness, this reflector is able to optimally reflect 3.5 GHz signals, especially to support 5G networks. This technology not only strengthens connectivity without the need for large infrastructure, but is also relevant to support the development of smart cities in the future.
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