Answer my following questions.
pancho_hideboo wrote on Mar 4th, 2009, 4:34am:Attached S21 is insertion loss of MEMS Switch ?
giorgilloz wrote on Mar 9th, 2009, 4:14am:For the SOLT calibration, of course, i used a commercial SOLT kit calibration of Karl SUSS.
You seemed to use commercial calibration fixture for SOLT. But what calibration fixture did you use for TRL ? Did you make it by yourself ?
For both SOLT and TRL calibration fixtures you used, sizes are same as "ScreenHunter_01_Mar__10_10_04.gif" ?
Any taper geometry is used for relaxing sudden size change ?
giorgilloz wrote on Mar 10th, 2009, 3:13am:My question is if the oscillations in the measurement are due to the finite ground plane configuration of the CPW.
What do you mean by
the oscillations ?
If you mean radiation toward CPW groud plane edge direction due to resonance, it is arouid 27.5GHz of "Insertion_Loss.gif".
giorgilloz wrote on Mar 10th, 2009, 3:13am:Moreover, I guess that the oscillation is enhanced around the 35 GHz frequency because the pitch I am using is wider than the CPW geometry
and I am not far from the edges, with possible enhancement of the higher frequencies reflections.
If calibration is correctly done, such multiple reflection effects can be removed.
Using SOLT calibration, show me following two S21.
(1) S21 of THRU pattern of SOLT
(2) S21 of THRU pattern of TRL