Multiple bandstop filters can always be expressed in terms of a multiple bandpass filter.
2.
Bandstop filters can be regarded as a combination of a lowpass and a highpass filter.
3.
In fact, in some treatments, the bandstop filter is considered to be a type of multiple passband filter having two passbands.
4.
Where \ lambda _ g is the wavelength corresponding to the central rejection frequency of the bandstop filter, measured-of course-in the microstrip line material.
5.
The dual circuit of the bandstop filter can be obtained simply equating the reflection coefficient of the bandstop FSS to the transmission coefficient of the bandpass FSS to obtain ( if we use L 1, C 1 for the bandstop patch FSS and L 2, C 2 for the bandpass mesh FSS ):
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