Looking back, communication has evolved rapidly, supporting its now common use in both military and civilian fields. The more traditional HF-VHF-UHF frequencies were put aside and considered part of the "old communications world". The development of mobile phone shielding also changes with the development of communications. Communications in recent years have allowed for the wider use of HF frequencies with modern wideband HF (WBHF) delivering rates up to 240 kpbs on 48 kHz wide channels. HF communications are used for intercontinental connections and are suitable for military purposes worldwide such as aircraft, submarines, naval ships, etc..
Additionally, HF communications encryption (such as HF hopping) becomes easier to deploy, causing intelligence agencies to have major problems in decrypting HF frequencies once they are turned on. Cell phone jammer can use up to 5KW output power per frequency band for long-distance high-frequency interference. Provide operators with an open communication window.
The high-frequency interference inside the mobile phone shielding device can reach up to 36 channels. Shields the entire HF frequency from 1.5MHz to 30Mhz.
Number-based jamming (i.e. “smart jamming”). Cell Phone Shield scans for interference at super fast speeds.
Mobile phone shields are designed in a variety of specifications. For example, in vehicles, on naval ships and on aircraft dedicated to electronic warfare, in examination rooms, directional or omnidirectional antennas can be connected to the outside of signal blockers for high-frequency interference, and mobile phone shields can also have built-in antennas.