Three protection abilities of antenna of cell phone jammer

Other Technical Parameters of Antenna of Cell Phone Jammer

1. Passive intermodulation (PIM) of antenna of cell phone jammer The PIM characteristic means the intermodulation effect of such passive components as the joint, feeder line, antenna, filter and so on caused by their own nonlinearity when they work under the condition of high-power signal of many carrier frequencies.

Normally, the passive component is considered to be linear. But passive components have the certain nonlinearity to different extent under the high-power condition. This kind of nonlinearity can be caused by the following factors: metal contact o different materials; unsmooth contacting surface of the same material; the joint is not close; the magnetic material exists and so on.

The intermodulation product will interfere with the communication system especially the intermodulation product lying in the receiving band will seriously influence the receiving performance of the system. Therefore, there are the strict requirements for the intermodulation characteristic of such passive components as the joint, cable, antenna and so on in the GSM system. The passive intermodulation index of the joint we select can reach -150dBc; that of the cable can reach -170dBc; that of the antenna can reach -150dBc.

2. Size and weight of antenna of cell phone jammer The configuration should be as small as possible and the weight should be as light as possible under the condition that every electrical index is met for the convenience of storage, transportation, installation and safety of the antenna.

3. Wind load of antenna of cell phone jammer The base station antenna is normally installed in the high building and iron tower. Especially in the costal area, the perennial wind speed is big so it is required that the antenna can work normally at the speed of 36m/s and it will not be damaged at the speed of 55m/s.

4. Working temperature and humidity of antenna of cell phone jammer The base station antenna should work normally in the temperature range of -40℃-+65℃ and in the relative humidity range of 0-100%.

5. Lightening protection of antenna of cell phone jammer The input ports of all radio frequencies of the base station antenna are all required to be grounded directly.

6. Three protection abilities of antenna of cell phone jammer The base station antenna should have the three protection abilities, i.e. moisture protection, salt frog protection and fungus protection. For the omnidirectional antenna of the base station, the inverted installation should be allowed and at the same time, the three protection requirements should be met.

7. Types of antenna of cell phone jammer The antenna has directional antenna and omnidirectional antenna according to the direction; single polarization antenna and dual polarization antenna according to the polarization form. Different antenna forms should be adopted according to different locations, different landforms and different user distributions and other situations.

The antenna has many types (models). The main types of the current base station antennae are as follows: 1. Omnidirectional and middle-gain（8-9dBi）, high-gain（more than 9dBi）ordinary antenna (without zero padding and forming technology). 2. Omnidirectional and middle-gain（8-9dBi）, high-gain（more than 9dBi）formed antenna (zero padding). 3. Omnidirectional high-gain（more than 9dBi）ordinary wave beam downdip antenna (without zero padding, 2°-6°) 4. Directional middle-gain（12-15dBi）, high-gain（more than 15dBi）ordinary antenna-plane half-power wave beam width 90°. 5. Directional middle-gain（13-16dBi）, high-gain（more than 16dBi）ordinary antenna-plane half-power wave beam width 65°. 6. Omnidirectional high-gain（more than 9dBi）formed wave beam downdip antenna (zero padding 5%-25%, descending 1.25°-6°).