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Practical Electronics/High Pass Filter
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Low Pass Filter
RL Network
Plot three points above we have a graph . From graph, we see voltage does not change with frequency on High Frequency therefore RL network can be used as High Pass Filter
CR Network
Plot three points above we have a graph . From graph, we see voltage does not change with frequency on High Frequency therefore LR network can be used as High Pass Filter
Summary
In general
High Pass Filter can be constructed from the two networks RL or CR network .
High Pass Filter has stable voltage does not change with frequency on Low Frequency .
High pass filter can be expressed in a mathematical form of
T = RC for RC network
for RL network