The gain of GSM/DCS omnidirectional antenna of cell phone jammer

The gain of GSM/DCS omnidirectional antenna of cell phone jammer is 1-2dBi.
Currently, mobile phone antenna circuit main use of the following three forms, the following were introduced.
The antenna switch circuit has four control signals: U151 2-pin output signal control U150 ANTl within the antenna switch is turned to move transmitter or receiver circuit. U151 3-pin output signal control U150 in ANT2 antenna switch is turned to the outside or turning transmitter receiver circuit. RX275-DCS signal control U150 within the DCS band signal and the internal or external antenna is connected. RX275-GSM-PCS signal control U150 within the GSM, PCN-band signal and the internal or external antenna is connected. Some cell phone antenna circuit with a duplex filter (duplexer). Diplexer is a passive device. Internal filters including transmit and receive filters, which are band-pass filter. Duplexer has three ports, namely, public-ended antenna port, transmit output and receive input. Nokia 5110 mobile phone on the use made of this form of the antenna circuit, the circuit shown in Figure 4-5. cell phone jammer is ideal for a large room, restaurant and cinema.
Nokia 3310 mobile phone with built-in antenna. Antenna receives induction of cellular high-frequency signal is converted into electrical signals, these signals include GSM900 receive RF signals. DCSl800 receive RF signals, and other unwanted signals. Antenna to the RF signal is first to reach Z502. Z502 is a dual information contained RF switch devices. Its GSM and DCS RF signal RF signal channel switching, but also for receiving and transmitting RF signals to be separated. Z502 module control signal from the N500. When TXVGSM signal is active, Z502 GSM antenna connected to the receiver and transmitter circuit; when TXVDCS signal is active, Z502 connect the antenna to the DCS receiver and transmitter circuits. As can be seen from the above analysis, two information and antenna switch in the circuit structure and function are very similar, the difference is, the antenna switch IC is a set of internal switches and no filter, and dual-duplex information not only inside filter, but also includes the switching circuit. cell phone jammer needs 12V car power. 
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