Differences between GPRS, WiFi and Bluetooth wireless antenna

1、 GPRS antenna is different in each GSM band

GPRS refers to the realization of digital transmission in GSM frequency band, which is 890-960mhz in 2G era and 900-1800mhz in 3G era. The channels of various operators are different, and the frequency bands of 2G and 3G are also different, so the GPRS antennas of 2G and 3G are also different.

2、 WiFi wireless antenna and Bluetooth wireless antenna

WiFi wireless antenna and Bluetooth wireless antenna use 2.4G frequency band, but if subdivided, the two protocols use channels with different frequencies, just like the channel on the highway. WiFi takes the small lane, Bluetooth takes the cargo lane, cars can't go to the arrival lane, and trucks can't go to the small lane.

Because the channels are very close, the antenna can be universal, but the effect will be biased (it doesn't matter because the PCB antenna covers a wide frequency band). As long as it is a whip antenna, it can be used for Bluetooth and WiFi, because the signal requirements of Bluetooth wireless antenna and WiFi wireless antenna are not much different, and the communication distance is about ten meters.

However, GPRS antenna has high requirements for signals. Generally, the communication radius of cellular GPRS network is a few kilometers. The equipment receiving signals generally uses a unique round hole antenna, otherwise the signal cannot be received. The general frequency of GPRS is about 1GHz, while WiFi is between 2.4GHz and 5GHz, and Bluetooth is almost the same. Therefore, the antenna of WiFi wireless antenna and Bluetooth wireless antenna is different from that of GPRS antenna.

There is a relationship between the wavelength and the size of the receiving antenna. If the wavelength is different, the antenna size is different. In addition, there is the problem of impedance matching. Impedance mismatch will cause signal reflection and signal attenuation.