Customers who are familiar with mobile phone jammers usually know that each jamming device has many antennas, and as the mobile phone system gradually develops from 2G to 5G, the number of antennas has gradually increased from the initial 3-4 to the present. 10-12 roots. Although most mobile phone jammer manufacturers have adopted the built-in installation of the antenna, there are still many customers who have questions and needs: in the expectation of improving the effect of the mobile phone jammer, is it possible to make the antenna longer and longer? it is good?

The low-power conventional mobile phone jammer is discussed here. Indeed, the most used kind of jamming device is a soft whip omnidirectional antenna with a length of about 20cm. The nominal gain value of this antenna is 2-3dB, and the standing wave frequency of the antenna is The range is from 700MHz-6000MHz. In order to unify and beautify the appearance, the antenna manufacturer uses a uniform length of rubber sleeve for the antenna. However, the real function of the antenna is not the rubber sleeve directly seen on the outside, but the antenna core inside. If the rubber cover is removed, we will easily find that the lengths of the antenna cores in different frequency bands are different.

According to the basic working principle of radio frequency signal transmission through the antenna, the length of the antenna core is inversely proportional to the frequency of the standing wave, that is to say, the higher the frequency of the standing wave, the shorter its wavelength, and the corresponding length of the antenna core also shorter. Similarly, when the frequency value of the standing wave is closer to the low frequency range, the wavelength becomes longer and longer, and the corresponding antenna core length increases accordingly.

From this, it is not difficult to draw a conclusion: in a mobile phone jammer, the antenna with the longest antenna length must be the antenna in the 700-800MHz frequency band, and the antenna with the shortest antenna length must be the antenna with frequency estimation of 5700-5900MHz. Although they seem to be the same length from the outside, the antenna cores inside are definitely different in length!

Let's go back to the original question: Is the longer the mobile phone jammer's antenna the better? Our answer is: In the specified frequency range, calculated strictly according to the corresponding relationship between wavelength and frequency, after increasing the length of the antenna (wire core), the gain value of the antenna is correspondingly improved, then it is necessary to improve the interference performance of the mobile phone jammer. is helpful.