Directional ( or constant impedance) combining filters for FM band.
Suitable to connect two or more transmitters working at different frequencies to the same antenna system.
This system is convenient when the working frequencies of the transmitters have a short distance. With our modular configuration it is possible to connect transmitters with working frequencies with spacing up to 0,7 MHz. Constant impedance combining filters permit an expansion of the transmitting system to future needs. The isolation between the two transmitters is obtained by using hibrid couplers and band-pass filters. This system is more expensive than star combining filters type, but more reliable.