RF High Stopband Rejection Small Size Telecom High Pass Filters

It allows signals with frequencies greater than a certain threshold to pass, but rejects signals with frequencies less than that threshold. The passive high-pass filter is a filter composed of passive components (R, L and C), using the principle that the reactance of capacitors and inductors changes with the change of frequency. The advantages of high-pass filter are: the circuit is relatively simple, does not require DC power supply, high reliability; It can effectively suppress the low frequency signal and make the high frequency signal pass through. The disadvantage of high-pass filter is that the attenuation rate is relatively large, which may affect the accuracy of the signal; The signal in the passband has energy loss, the load effect is obvious, and the use of inductors is easy to cause electromagnetic induction, and the volume and weight of the filter are relatively large when the inductance L is large, which is not applicable in the low frequency domain.