The Impact of Multiple Antennas on Cell Phone Signal Blockers

Cell phone signal blockers are widely available in various models on the market today. Regardless of their power or device size, these blockers are equipped with multiple antennas. Some people may be concerned about the excessive number of antennas and wonder if it is possible to reduce their quantity. This article aims to address this question and explore the implications of reducing the number of antennas on cell phone signal blockers.

The Relationship Between Antennas and Signal Blocker Modules:

The number of antennas on a cell phone signal blocker is equal to the number of signal blocker modules. In order to completely block all 2G, 3G, 4G, 5G, and WiFi signals, a signal blocker would require at least 10 to 12 frequency bands, according to the various frequency band standards of different mobile phone systems. This means that a signal blocker needs to be equipped with 10 to 12 shielding modules that cover these frequency bands, thereby determining the number of antennas required.

Feasibility of Reducing the Number of Antennas:

In theory, it is possible to reduce the number of antennas on a cell phone signal blocker, and there are no technical barriers to doing so. However, there are certain associated losses when merging multiple antennas. These include:

  1. Increased size: Merging antennas of different frequency bands requires the use of a combiner, which increases the space required for installation and consequently enlarges the overall size of the signal blocker.
  2. Signal attenuation: The connection between the shielding modules and the antennas through the combiner or connecting cables may result in signal attenuation. This can lead to a decrease in the effective power transmitted from the antennas.
  3. Decreased antenna gain: Merging multiple frequency bands into a single transmitting antenna increases its bandwidth. However, this increase in bandwidth reduces the antenna’s gain, further decreasing the effective transmission power of the cell phone signal blocker.


In conclusion, the decision to merge multiple antennas on a cell phone signal blocker is a trade-off. If maximizing the blocking effect of the signal blocker is the primary concern, then the option of merging antennas should be abandoned. While reducing the number of antennas may improve aesthetics and concealment during usage, it comes at the cost of increased size, signal attenuation, and decreased antenna gain. Ultimately, the choice depends on the specific requirements and priorities of the user.