Currently, to enhance PCB shielding, mobile phones use two main methods - soldered perforated cans and plated covers with EMI gaskets.

　　In addition to this, there is the latest boom in mobile phone miniaturization. This means that high-frequency components are now crammed into very tight spaces, which in turn reduces the size of the printed circuit board (PCB) required.

　　In a recent study, when traditional test methods were used to understand shielding requirements in battery-operated portable wireless designs, several shortcomings were identified. Most of the test methods available today were developed to identify the materials that make up the EMI enclosure. However, there is currently no officially published test method to study the Shielding Effectiveness (SE) of an assembled shield on a portable wireless device PCB.

　　After the mobile phone shielding device is turned on, the effective coverage of the shielded signal is usually tens of square meters to hundreds of square meters. However, due to the influence of the communication base station near the usage scene or other factors, the shielding range may not achieve the expected effect. At this time, people always want to use some methods to expand the coverage of the shielded signal, so that the shielding effect of the mobile signal jammer can be greatly improved. Improve.

　　So, what are the ways to improve the shielding effect of mobile phone jammers?

　　The answer is to look for it in two ways. The first aspect is to analyze from the mobile phone jammer itself. For example, whether the mobile phone jammer is a qualified product of a regular manufacturer, whether its working frequency band is completely correct, and whether it has a frequency bandwidth. Is it too wide to reduce the average output power? Is the frequency band division of mobile phone jammers reasonable? Are there too many band combinations? Are the antenna gain values ​​ideal to support cell phone shields? If the antenna gain is only 1-2dB, then replace the antenna with a gain value of 3-5dB, and the shielding effect will be significantly improved.

　　The second aspect is to analyze the installation environment and surrounding environment of the mobile phone shielding device, such as: is the mobile phone shielding device wall-mounted or desktop placed? Is the installation height too high? The usual recommended height is 1.8-2.5 meters. Or is it too low to put it directly on the ground? This will cause too many obstacles in the signal transmission path, serious signal attenuation, and affect the shielding effect. In addition to these factors, observe and analyze the distribution of surrounding base stations. It is recommended to install the mobile phone shielding device on the transmission path from the base station to the site, usually close to the window of the room.

　　If you want the cell phone jammer to cover a larger area, the simple and straightforward way is to use a more powerful jammer gps.