Understanding the Frequency Bands of Mobile Signal Blockers

Exploring the Configuration of Signal Blocking Modules in Mobile Signal Blockers

Mobile signal blockers, commonly known as cell phone jammers, are devices designed to block signals across various frequency bands. In order to effectively block signals from 2G, 3G, 4G, and 5G networks, a standard mobile signal blocker typically contains no less than 10 signal blocking modules. This article aims to provide an overview of the frequency bands used in mobile communication and the configuration of signal blocking modules within mobile signal blockers.

Frequency Bands in Mobile Communication:

To understand the configuration of signal blocking modules, it is important to first grasp the division of frequency bands in current mobile communication. According to international standards and domestic regulations in China, the known frequency range for mobile communication as of the end of 2022 is between 700MHz and 4960MHz. It is worth noting that the 4800MHz-4960MHz range is designated for China Mobile and China Broadcasting’s 5G network, which falls under the ultra-high frequency band. However, this frequency band is not widely deployed in China and is currently limited to specific applications in certain locations.

Configuration of Signal Blocking Modules:

Considering the exclusion of the 4800MHz frequency band, the main frequency bands for mobile communication are primarily distributed between 700MHz and 3600MHz. Within this range, several key frequency bands are utilized, including 700MHz, 800MHz, 900MHz, 1800MHz, 1900MHz, 2000MHz, 2100MHz, 2300MHz, 2500MHz, and 3400MHz. When designing and configuring signal blocking modules for these frequency bands, manufacturers of mobile signal blockers often combine or share components based on the matching parameters of power amplifiers and signal sources. Commonly shared modules include 800MHz/900MHz, 1800MHz/1900MHz, 2000MHz/2100MHz, 2300MHz/2400MHz, 2500MHz/2600MHz, and 3400MHz/3500MHz.


In conclusion, while a mobile signal blocker may contain more than 10 different signal blocking modules, it is likely that there are at least 4 to 6 identical module configurations. Each configuration consists of two interchangeable modules, which are adjusted during factory calibration to correspond to specific mobile frequency bands by tuning the frequency offset and bandwidth. Understanding the frequency bands and the configuration of signal blocking modules in mobile signal blockers is crucial for ensuring effective signal blocking across various generations of mobile networks.