attenuator pad design

Hi i would like to design a variable attenuator pad (~18dB) using ADS Momentum Simulation. Did anyone have any good suggestion regarding the attenuator design info and link to design on that in microwave circuit?

Look at the attachment file. May be, it will helpful for you.

Hi i would like ask anyone know the constraint of designing passive attenuator design in microwave (pi-network, tee-network for example) ?

Dear,

Check this link for complete Attenuator Design Equations:

http://www.rfcafe.com/references/ele...ttenuators.htm

If you want a fixed attenuation you can use sourface mount Attenuators From Minicircuits (PAT & LAT Series,DC-7GHz)

Good Luck

You can calculate either a PI or T network. One will have more realizable values than the other depending on if you are building from lumped components, deposited as a thin flim, or thick film. If you are using lumped components you need to know to a degree the package parasitics since this will affect the attenuation over frequency. Capacitance in paralllel with the resistive material limits the amount of attenuation you can achieve. If designing a thin film then 2.5D EM simulation is very usefull.

PI attenuator arrangement (almost) always usable for higher frequencies, because the attenuator "length" is only one resistor "long" opposite to the T arrangement , which is two component "long"