EXPERIMENT-4
AIM: Design Coupler Using ADS.
Theory:
A coupler is basically a device that couples the power from the input
port to two or more output ports equally with less loss and with or without the
phase difference. The branch line coupler is a 3 dB coupler with 900-phase
difference between the two output ports. An ideal branch line coupler as shown
in figure 1 is a four-port network and is perfectly matched at all the four
ports.
The [S] matrix of the ideal branch line coupler is given as follows
To Design coupler at 2 GHz and
simulate the performance using ADS.
Calculate the values of the
capacitances (C0 & C1) and inductances (L) required for the Lumped
model of the coupler shown in Figure using the given formulae.
Where fc is the design frequency of the coupler
Z0 is the characteristic impedance of the transmission line
Typical Design Specifications:
Design Frequency fc = 2 GHz
Angular Frequency ω in radians =
2pfc = 1.25 x 1010
Characteristic
Impedance Z0 = 50 p
Substituting
the values in the above design equation the values for the lumped model are
obtained as
follows
C1 = 1.6
pF
L = 2.8
nH
C0 =
0.66 pF
Design in ADS:
Simulation
Results:
Conclusion:
No comments:
Post a Comment