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Are the antenna lengths of signal jammers all the same?

Are the antenna lengths of signal jammers all the same?

  • 2022-10-24

signal jammer

As one of the most important components of the signal jammer, the antenna is the most common for every customer who comes into contact with this product. The most common one is the cylindrical omnidirectional antenna. When customers have the opportunity to see different models, After using various types of signal jammers for different purposes, you will find that in addition to the different appearances of the jamming devices, the antennas configured are also different. In particular, there are multiple antennas configured by some interfering devices, and their lengths are exactly the same, but there are multiple antennas configured by some devices, and their lengths are not exactly the same. What is going on?

First of all, let's take a look at the structure of the omnidirectional antenna. The antenna of the signal jammer we usually see is actually only the shell of the antenna. The antenna shell is hollow in the middle, and the real performance of the antenna is in the shell. , Hidden in the antenna shell is the antenna core, which can be a radio frequency cable, or an antenna vibrator made of copper wire, copper sheet or other metal materials.

The length of the core of the antenna is related to its corresponding standing wave frequency. Different standing wave frequencies use different antenna core lengths. According to the characteristics of the relationship between frequency and wavelength, there is a basic rule: the higher the frequency, the shorter the core length of the antenna, on the contrary, the lower the frequency, the longer the core length of the antenna.

We sometimes see signal jammers that use the same length of antenna. In fact, these antennas use a uniform length of the antenna housing, which is done for aesthetics and uniformity. In fact, each of these antennas with the same length corresponds to a working frequency band. Therefore, if you only need to observe these antennas carefully, you will find that the tail ends of these antennas will have clear identification marks of frequency parameters. In practical applications, usually low-power signal jammers use omnidirectional antennas of the same length.

In high-power signal jammers, the configured omnidirectional antennas have relatively high requirements for technical indicators such as carrying power and standing wave ratio, and also to avoid wasting unnecessary antenna casing sleeves. It is no longer mandatory to make the length of the antenna exactly the same. It even sometimes appears on high-power signal jammers. Not only will the antenna lengths of each frequency band be inconsistent, but also the diameter of the omnidirectional antenna will be inconsistent.


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