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In a lot of textbooks, filters seem to be designed around a matching source and load impedance. However, If I have a filter stage between an antenna and an LNA, wouldn't I want the load impedance(i...
#2: Post edited
by
Olin Lathrop
·
2020-10-10T15:46:08Z (about 4 years ago)
Removed content-free fluff
Hello.- In a lot of textbooks, filters seem to be designed around a matching source and load impedance. However, If I have a filter stage between an antenna and an LNA, wouldn't I want the load impedance(input to the LNA) to be large with respect to the source(antenna) in order to not attenuate the signal even further?
- I guess another way to phrase this is why do we care about maximum power transfer at this stage and not preserving as much of the signal amplitude as possible instead?
- In a lot of textbooks, filters seem to be designed around a matching source and load impedance. However, If I have a filter stage between an antenna and an LNA, wouldn't I want the load impedance(input to the LNA) to be large with respect to the source(antenna) in order to not attenuate the signal even further?
- I guess another way to phrase this is why do we care about maximum power transfer at this stage and not preserving as much of the signal amplitude as possible instead?
#1: Initial revision
by
jm567
·
2020-10-09T22:53:02Z (about 4 years ago)
Filter Impedance Consideration
Hello. In a lot of textbooks, filters seem to be designed around a matching source and load impedance. However, If I have a filter stage between an antenna and an LNA, wouldn't I want the load impedance(input to the LNA) to be large with respect to the source(antenna) in order to not attenuate the signal even further? I guess another way to phrase this is why do we care about maximum power transfer at this stage and not preserving as much of the signal amplitude as possible instead?