Thread: Impedance of Band Pass Filter

(1) How do I calculate the impedance using the transfer function of the Inverting Band Pass Filter shown in the link below?

http://www.electronics-tutorials.ws/filter/fil51.gif

The Transfer Function is H(jw)=jwR2C1/[(jwR2C2)(jwR1C1)]

(2) How is this transfer function derived/obtained?

Transfer function of low pass filter: - (R2/R1) * (1/[jwR2C+1])
Transfer function of high pass filter: - (jwR2C)/(jwR1C+1)

So if I multiply these together it seems I get the transfer function of the band pass filter H(jw) multiplied by R2/R1.
So how does the R2/R1 just disapear from the transfer function?