Band Pass

Defines a band pass filter with the parameters shown in the configuration window above. A band pass filter passes frequencies in the pass band with minimal attenuation and rejects (attenuates) signals outside of the pass band. A band pass filter will attenuate both low and high frequencies as seen below in the plot of a band pass filter in EMIT.

Noise Temperature (K): Noise power added by the filter.

Insertion Loss: Insertion loss defines the magnitude by which pass band signals are attenuated and is specified in dB. The pass band of the band pass filter is defined as all frequencies that are above the lower cutoff frequency and below the higher cutoff frequency.

Stop Band Attenuation: Stop band attenuation defines the magnitude of the attenuation for signals with frequencies below the lower stop band frequency and above the higher stop band frequency. The attenuation of signals with frequencies between the lower stop band frequency and the lower cutoff frequency or between the higher cutoff frequency and the higher stop band frequency is determined by calculating the slope between these points and assuming a linear roll-off.

Lower Stop Band: The lower stop band defines the maximum frequency of the lower stop band. All frequencies below the lower stop band value are attenuated by an amount equal to the stop band attenuation.

Lower Cutoff: The lower cutoff defines the minimum frequency of the pass band. All frequencies between the lower cutoff and the higher cutoff are attenuated by an amount equal to the filter's insertion loss.

Higher Cutoff: The higher cutoff defines the maximum frequency of the pass band. All frequencies between the lower cutoff and the higher cutoff are attenuated by an amount equal to the filter's insertion loss.

Higher Stop Band: The higher stop band defines the minimum frequency of the higher stop band. All frequencies greater than the higher stop band value are attenuated by an amount equal to the stop band attenuation.