XC1400P-03S Datasheet, PDF (23/24 Pages) Anaren Microwave – Hybrid Coupler 3 dB, 90°

Variable Phase Shifter Circuit Utilizing a 3dB Coupler
Model XC1400P-03S
Rev B
Input
1
Γ× 0.707V ∠θ
0.707V∠θ (-3dB)
4
Vdc
Varactor Diodes
Output
2
3
* |Γ (0.5V ∠2θ -90 + 0.5V ∠2θ -90)| =| Γ|
0.707V ∠θ -90 (-3dB)
Γ× 0.707V ∠θ -90
• The phase angle of the signal exiting port 2 will vary with the phase angle of Γ, which is the reflection angle from
the varactor. The varactors must be matched so that their reflection coefficients are equal.
The Quadrifilar Antenna Feeding Network Utilizing 3dB Couplers
Input 1V -->
50 ohm
termination
Output 1
0.25V∠ 0
Output 2
0.25V∠ -90
50 ohm
termination
90 degree
transmission
line
50 ohm
termination
Output 3
0.25V∠ -180
Output 4
0.25V∠ -270
The Quadrifilar antenna network illustrated above use three 3dB (hybrid) couplers and one 90-degree transmission line
as phase shifter. The first 3dB hybrid coupler splits the input signal in half and also introduces a 0° phase shift in one
path and a 90° phase shift in the other path. The 0° path is connected directly to another 3dB hybrid coupler. This
second hybrid coupler again splits the signal in half and introduces another 0° phase shift in one path and a 90° phase
shift in the other. The 90° path from the first 3dB hybrid is connected to a piece of transmission line that is 90° long. This
transmission line is then connected to a third 3dB hybrid coupler which splits the signal in half and introduces another a
0° phase shift in one path and a 90° phase shift in the other. The resulting output signals are as required for radiation
and are labeled in the figure.
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