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BSF_Polynomial (Bandstop Filter, Polynomial)

Symbol

Available in ADS and RFDE

Parameters

Name

Description

Units

Default

Numerator

List of numerator coefficients

None

list(1)

Denominator

List of denominator coefficients

None

list(1,1.4,1)

Gain

Gain factor

None

1.0

Fcenter

Passband Edge Frequency

GHz

1

BWpass

Passband Edge-to-Edge Width

GHz

1.0

StopType

Stopband input impedance type: OPEN or SHORT

None

open

Z1

Input port reference impedance

Ohm

50

Z2

Output port reference impedance

Ohm

50

Notes/Equations
  1. This is an S-domain filter.
  2. Denominator and Numerator are lists of polynomial coefficients.
    The transfer function for the filter is:

    where
    S = −j  ×  (F o /F low − F low /F o )/(Freq/F o − F o /Freq)
    and
    Freq is the analysis frequency
    F low = Fcenter − 0.5 × BWpass
    F o = sqrt((Fcenter - 0.5 × BWpass) × Fcenter + 0.5 × BWpass))
    At least one Denominator coefficient must be supplied.
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