PASSIVE INTERMODULATION INTERFERENCE CONTROL CIRCUITS

摘要

Passive intermodulation interference control circuits constructed from distributed elements of defined length and impedance segments of transmission media. The distributed elements can be combined with conventional discrete elements, such as resistors, to create a passive circuit that can be tuned to have a desired frequency response by selecting the size, length and position of the distributed elements. That is, the complete PIM interference control circuit is typically constructed from a combination of discrete and distributed elements and directly connected to or within the transmission media carrying the analog electromagnetic energy through a continuous extension of the transmission media. As such, the PIM interference control circuit can be located very close to the source of the PIM interference, such as the antenna's power divider. When strategically located in this positionk, the PIM circuit controls the intermodulation interference right at the source, before it enters the electronics of the receiver.