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bandstop การใช้

ประโยคมือถือ
  • Multiple bandstop filters can always be expressed in terms of a multiple bandpass filter.
  • Bandstop filters can be regarded as a combination of a lowpass and a highpass filter.
  • The usual bandforms are lowpass, highpass, bandpass and bandstop, but others are possible.
  • Similar concepts are applied in audio compression, where sound frequencies inaudible to humans are bandstop filtered.
  • The equivalent circuit for a patch-type bandstop FSS is shown in Fig . 2.4 . 1-2.
  • In fact, in some treatments, the bandstop filter is considered to be a type of multiple passband filter having two passbands.
  • Where \ lambda _ g is the wavelength corresponding to the central rejection frequency of the bandstop filter, measured-of course-in the microstrip line material.
  • This produces a bandpass circuit ( with parameters L 2, C 2 ) which is the dual of the bandstop circuit ( with parameters L 1, C 1 ).
  • The two fundamental types of FSS are shown in Fig . 2.4 . 1-1 to the right-the bandpass mesh-type FSS and the bandstop patch-type FSS ( Metal-mesh optical filters ).
  • For small values of ?, the impedance of the inductor, j?L, is smaller than the impedance of the capacitor, 1 / j?C, therefore the capacitor dominates the shunt impedance and so the patch-type bandstop FSS is capacitive below resonance.
  • A bandpass mesh-type FSS sheet is a parallel connection of L, C and bandstop patch-type FSS sheet is a series connection of L, C and in both cases, the L, C values are determined from the center frequency and bandwidth of the filter.
  • 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 ):
  • 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 ):
  • 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 ):