CouplerSingle (Single Coupler)
Symbol
Available in ADS
Parameters
Name |
Description |
Units |
Default |
|---|---|---|---|
Coupling |
Coupling factor |
dB |
10 |
F1 |
First frequency breakpoint |
|
|
F2 |
Second frequency breakpoint |
|
|
F3 |
Third frequency breakpoint |
|
|
MVSWR1 |
Main arm Voltage standing wave ratio for frequency ≤ F1 |
None |
1 |
MVSWR2 |
Main arm Voltage standing wave ratio for F1 < frequency ≤ F2 |
None |
1 |
MVSWR3 |
Main arm voltage standing wave ratio for F2 < frequency ≤ F3 |
None |
1 |
MVSWR4 |
Main arm voltage standing wave ratio for frequency > F3 |
None |
1 |
CVSWR1 |
Coupled arm voltage standing wave ratio for frequency ≤ F1 |
None |
1 |
CVSWR2 |
Coupled arm voltage standing wave ratio for F1 < frequency ≤ F2 |
None |
1 |
CVSWR3 |
Coupled arm voltage standing wave ratio for F2 < frequency ≤ F3 |
None |
1 |
CVSWR4 |
Coupled arm voltage standing wave ratio for frequency > F3 |
None |
1 |
Loss1 |
Attenuation for frequencies ≤ F1 |
dB |
0 |
Loss2 |
Attenuation for F1< frequency ≤ F2 |
dB |
0 |
Loss3 |
Attenuation for F2 > frequency ≤ F3 |
dB |
0 |
Loss4 |
Attenuation for frequencies > F3 |
dB |
0 |
Direct1 |
Directivity for frequency ≤ F1 |
dB |
100 |
Direct2 |
Directivity for F1 < frequency ≤ F2 |
dB |
100 |
Direct3 |
Directivity for F2 < frequency ≤ F3 |
dB |
100 |
Direct4 |
Directivity for frequency > F3 |
dB |
100 |
ZRef |
Reference impedance for all ports |
Ohm |
50 |
Temp |
Temperature |
°C |
None |
CheckPassivity |
Check passivity flag: if set to yes, a passivity check is performed and a warning is output if the device is not passive; if set to no, a passivity check is not performed. |
None |
yes |
Notes/Equations
- Port 1 is the input port; port 2 is the through port; port 3 is the coupled port. Note that the placement of these pins in ADS differs from many standard textbooks.
- Both ports of the main arm (ports 1 and 2) are assumed to have the same VSWR.
- Coupling is assumed to be constant across all frequency bands.
- Loss is the dissipation of the coupler; it affects S21 and S12 only. These S-parameters are calculated as if the coupler was dissipationless and are then scaled by
- Internally, coupler isolation is calculated as Coupling + Direct in dB.
- Up to three frequency breakpoints can be used to define four bands, with different directivity losses and VSWR values for each frequency band. If no frequencies are specified, then this model is frequency independent and uses Direct1, Loss1, and VSWR1 only.
- There is a 90-degree phase shift between the input and the coupled ports.
- In the coupled arm, the two ports are uncoupled.
- This is an ideal component with potentially non-causal behavior. It is not recommended for transient simulation.