30/03/2021
Many people often say "I need a band pass filter from frequency F1 to F2" when mentioning filter requirements. But In addition to frequency, filter also contains other key indicators.
Let’s take a look at the key indicators of a filter. The key indicators of a filter include frequency, stopband rejection, insertion loss, passband ripple, handling power, connector.
Everyone knows the frequency and not much to say. Stopband rejection refers to the degree of suppression of signals outside the passband, and the unit is dBc. For example, for a 9800~9880MHz bandpass filter, we require stopband rejection≥30dBc@9760MHz&≥30dBc @9920 MHz.
Insertion loss refers to the power loss that occurs when the signal passes through the filter, and the unit is dB.
Passband ripple is the range of signal fluctuations in the passband, usually expressed in dB.
Handling Power refers to the power that this filter can withstand when it is working. It needs to be clear whether it is continuous wave power or peak power.
Finally, it is necessary to clearly identify which type of connector is used.
If there are size restrictions, weight restrictions, working temperature requirements, etc., they can be provided to the engineer together.
That will help to improve communication efficiency.
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