RF duplexer_other information_Shenzhen Nordson Bo Communication Co., LTD

RF duplexer

Time：2024-06-20 Views：1

　　The receiving end filter resonates with the transmission rate and prevents the transmission power from entering the receiver in series, while the transmitting end filter resonates with the receiving frequency. Some RF duplexers do not label the transmitting and receiving ends, but only label LOW and HIGH. For example, if a certain RF duplexer has LOW=450 and HIGH=460, it means that the LOW end can be connected to a 450 Mbps receiver and the HIGH end can be connected to a 460 Mbps transmitter. The LOW end can also be connected to a 450 Mbps transmitter and the HIGH end can be connected to a 460 Mbps receiver. The transmitting and receiving frequencies can be reversed, but machines with a transmission rate of 460 cannot be connected to the 450 Mbps end of an RF duplexer to avoid damaging the radio and RF duplexer

　　Customize RF duplexers based on radio transmission and reception frequencies. The operating bandwidth of the 400 MHz RF duplex with a frequency difference of 10MHz can ensure an isolation degree of about 90dB at positive and negative 250kHz, and the isolation degree at a single frequency point can reach 120dB. When the frequency of use exceeds the rated bandwidth of the RF duplex, the isolation between transmitter and receiver will sharply decrease, and the transmission standing wave will increase. The sensitivity of the receiving circuit will decrease due to the influence of the transmission part, and it cannot work normally. The U-band of amateur wireless turntables generally has a transmission and reception difference of 5 megahertz. The RF duplex used adopts a narrowband design, which can ensure that the isolation degree does not decrease but the working bandwidth becomes narrower, with a positive or negative frequency of 100KHz. Practice has shown that using an RF duplex is better than using two antennas for transmitting and receiving.