The Limitations of Increasing Transmit Power in Full-Band Shielding Devices

## Exploring the Ineffectiveness of Power Enhancement in Full-Band Shielding Devices

As the deployment of 5G base stations continues to accelerate in recent years, the excessive density of these stations has resulted in a shorter effective distance for full-band shielding devices. In response to this issue, customers have expressed a desire to increase the transmit power of these devices. However, the results are often disappointing. This article aims to shed light on the limitations of power enhancement in full-band shielding devices and explain why the effective range does not significantly increase.

The Challenge of Increasing Transmit Power:

To test the effective interference distance, mobile phones are commonly used. Assuming that the radius of the effective interference area in a field test is 10 meters, replacing the device with a full-band shielding device that has an average output power of 4W reveals some interesting findings. Firstly, it is almost impossible to double the effective interference radius, meaning it is unlikely to reach a radius of 20 meters in the given field environment. However, it is observed that compared to the original 10-meter distance, increasing the transmit power by twice does result in a slight increase in the effective shielding distance, possibly reaching around 12 or 13 meters. At times, there may even be no noticeable change, with the effective range remaining close to approximately 10 meters.

Understanding the Conversion of Power Units:

The reason behind this limited improvement lies in the field of radio frequency communication, where the commonly used unit to represent RF output power, “Watt” (W), is converted into an electrical level unit known as “dBm.” For every doubling of power in Watts, the corresponding electrical level value increases by 3dBm. Referring back to the previous example, when the output power is 2W, the corresponding electrical level value is 33dBm. When the power is doubled to 4W, the electrical level value becomes 36dBm. Similarly, when the power is doubled again to 8W, the electrical level value becomes 39dBm. However, this increase is within a certain range, making it difficult to observe a significant improvement in the distance covered by full-band shielding devices.

Conclusion:

Despite the desire to increase the transmit power of full-band shielding devices to extend their effective range, the limitations of power enhancement become apparent. The conversion of power units from Watts to dBm reveals that doubling the power does not result in a doubling of the effective interference radius. While there may be a slight increase in the effective shielding distance, it is often not significant enough to meet the expectations of customers. As the deployment of 5G base stations continues, it is crucial to explore alternative solutions to address the challenges posed by the excessive density of these stations and ensure effective signal interference.