Hi!
i'm also interested in serial (chip or so) microstrip 3-bit Ku-band phase shifters specifications and suppliers (URL) if you know please inform
Thank you.
vio1965@mail.ru

Hello,

You can start by looking up Schiffman phase shifters on the internet.  These types of phase shifters offer large bandwidths with very consistent phase shifts.  These were introduced by B.W. Schiffman in the April 1958 IRE transactions on Microwave Theory and Techniques, available from the IEEE.

If you mean how is it done, then the most common way is to have switches and different lengths of microstrip lines to switch in 22.5, 45, 90 and 180 degree lengths. typically that's for phased array antennas. At lower frequencies (under 500 Mhz), instead of switching in differenct line lengths, groups of LC combo's are used (inductor/capacitor) to acquire the phase shifting.

Otherwise, some of the newer technologies have a long line of variable capacitors that are biased and the electrical length changes with the bias voltage, Agile Materials makes this new product.

Mini-Circuits and Hittite corporation have some of the GaAs technology phase shifters.
kch.