Phase Shift Design

Phase Shifter Design TutorialSheet 1 of 12

Phase Shifter Design Tutorial Introduction Phase shifters are devices used to adjust transmission phase in a system, they can be fixed phase digital phase shifters or analogue variable types. Switched-Line Phase shifter These phase shifters are similar to their attenuator equivalent where two SPDT switches are used to switch two line lengths, one of which is X degrees longer in electrical length than the other. The circuit is shown in Figure 1.
Vcontrol

Line length 2

Line length 1

Figure 1 Switched-line phase shifter. Line length 2 has a longer electrical length than line length 1 so when switched in line will cause an in-line phase shift φ=β(l2-l1).
Required phase shift φ = β(l 2 l 1 ) Where β =

ω
Vp

and Vp =

1

ε eff

Example Design a switched-line phase shifter wit