Impedance- A characteristic of the design of RF signal products, usually express in ohms and allows for system design for maximum signal transfer throughout system.

Input Return Loss– The standing wave ratio measured at the input port of an RF component with all ports properly terminated, expressed in dB. (Also referred to as Input VSWR, expressed as a ratio.

Insertion Loss- The characteristic of a splitter or a combiner that expresses in dB the signal loss between input and output signal levels.

IP2– Second order intercept point, the point at which second order products create spurious outputs, typically out of band.

IP3- Third order intercept point, the point at which third order products create spurious outputs, typically out of band.

Isolation– The characteristic of the separation expressed in dB of the output to output, input to input, or input to output port of RF Signal Management Products.

Inverting- Typically the output of a mixer in which the Local Oscillator frequency is above the input frequency and the output is the difference of the two frequencies.

L-Band– Frequencies ranging between 950 and 2,150 MHz

LNB- Low noise block converter, usually used on the downlink side of a satellite feed.