DPX-020/E diplexer consists of one low-pass filter and one high-pass filter. It includes three inputs/ outputs so that one port is used for connecting to antenna and other two ports are considered for connecting to two radios in frequency band of VHF and V/UHF. Configuration of the two mentioned filters causes the radios use one antenna simultaneously for transmitting/receiving information. Low signal loss in passing frequency band, high isolation between the ports, no need to electrical power supply, and low weight/size are some advantages of the DPX-020/E.