Are the antenna lengths of signal jammers the same?

The antenna is a key component of a signal jammer and one that customers often encounter when using these devices. The most common type of antenna is a cylindrical omnidirectional antenna. However, when customers have the opportunity to explore different models and use signal jammers for various purposes, they may notice that the antennas look and are configured differently.

To understand these differences, let’s take a look at the structure of an omnidirectional antenna. The antenna we usually see on a signal jammer is essentially the outer shell of the antenna. The outer shell is hollow, and the actual performance of the antenna is located inside it. The antenna core is hidden inside the antenna shell and can be an RF cable or a metal vibrator made of copper wire or copper sheet.

The length of the antenna core is related to its corresponding standing wave frequency. Different frequencies require antenna cores of different lengths. Based on the relationship between frequency and wavelength, a basic rule applies: higher frequencies require shorter antenna cores, while lower frequencies require longer antenna cores.

Although we may encounter Cell Phone jammers with antennas of the same length, these antennas are designed to cover specific frequency bands. The uniform length of the antenna shell is mainly for aesthetics and uniformity, but a closer look at the tail end of the antenna will reveal obvious frequency parameter identification. In practical applications, low-power signal jammers generally use omnidirectional antennas of equal length, while high-power signal jammers have more stringent technical requirements for omnidirectional antennas, such as power capacity, standing wave ratio, etc. In order to avoid unnecessary waste of antenna shell materials, the antenna length no longer needs to be completely consistent. High-power signal jammers may use antennas of different lengths for different frequency bands, and even the diameters of omnidirectional antennas may be different.

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