Can Older Signal Jammers Block 5G Signals?

Understanding the Limitations and Seeking Solutions

In recent years, the introduction of 5G networks has revolutionized the telecommunications industry. However, this advancement has also posed challenges for older models of signal jammers, which may not be capable of effectively blocking 5G signals. Communication experts explain that 5G networks operate on new radio frequency bands, rendering many older models of signal jammers incompatible with this technology.

Understanding the Frequency Bands of 5G Networks

To comprehend the limitations of older signal jammers, it is essential to understand the frequency bands utilized by 5G networks in China. China Telecom and China Unicom primarily employ the 3.5GHz frequency band, with each having access to 100MHz spectrum resources. On the other hand, China Mobile predominantly utilizes the 2.6GHz frequency band, with 160MHz spectrum resources, and the 4.9GHz frequency band, with 100MHz spectrum resources.

Working Principle of Full-Band Signal Jammers

Full-band signal jammers operate by emitting stronger signals within the corresponding frequency bands of mobile networks, thereby suppressing interfering signals and achieving the desired blocking effect. However, there are two possible reasons why older signal jammers may fail to block 5G signals. Firstly, it is plausible that 5G signals fall outside the working range of the full-band signal jammers used at specific locations. Secondly, 5G signals themselves may possess stronger resistance to interference, making it challenging for full-band signal jammers to successfully suppress them.

The Evolution of Communication Technology

As communication technology continues to evolve, the 5G signal standard differs from its predecessor, 4G. Consequently, older models of full-band signal jammers may not be capable of completely disrupting 5G signals. This limitation is not surprising, as 5G networks utilize new radio frequency bands that many older models of signal jammers do not support.

Addressing the Issue

To address this loophole, it is crucial to identify the types of signals present near examination venues in advance and deploy newer models of full-band signal jammers accordingly. Upgrading existing full-band signal jammers to support 5G technology is a viable solution. These upgraded devices can effectively block signals from 2G, 3G, 4G, 5G, WiFi, Bluetooth, covert earpieces, walkie-talkies, wireless data transmission, and more.

Case Study: SMa-818Q Full-Band Signal Jammer in Yunnan Province

In Yunnan Province’s Shilin County, the local examination center has successfully employed the SMa-818Q full-band signal jammer, which ensures comprehensive interference across all signal standards, leaving no room for vulnerabilities.


The incompatibility of older signal jammers with 5G signals is a foreseeable consequence of the rapid advancements in communication technology. As 5G networks utilize new radio frequency bands, many older models of signal jammers are unable to effectively block these signals. However, by upgrading existing technology and deploying newer models of full-band signal jammers, it is possible to bridge this gap and ensure the uninterrupted functioning of examination venues and other sensitive areas.