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Design >> RF Design >> Phase Shifter Design with a Branch Line Coupler
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Message started by nabla on May 22^nd, 2016, 5:17pm

Title: Phase Shifter Design with a Branch Line Coupler
Post by nabla on May 22^nd, 2016, 5:17pm

Hei,

i want to rebuild a 360 ° Phase Shifter from this paper "A Full-360 Reflection-Type Phase Shifter With Constant Insertion Loss for 2.45 GHz". If you can´t the the Paper on IEEEexplore here is the Link to the circuit of the Phase Shifter Design with a Branch Line Coupler.

https://goo.gl/93Hw0n

The Design:

I took the coupling factor rz = 2

I calculated the series inductor Ls with 2.354 nH and then the optimale Rp with 80 Ohm. The solution of ZB1 = 50 Ohm, ZB2 = 25 Ohm, Zt = 25 Ohm, Zt/2 = 12.5 Ohm and ZA = 25 Ohm.

I use the varactor diode from skyworks smv 1245

Afterwards I simulate the circuit in ADS. But my Problem is the structure of the circuit. Can you help me with the correct circuit. I simply do not achieve 360° >:( What am I doing wrong :-/ ??