TCoupler (Tee Power Divider)

Symbol

Parameters

Name	Description	Unit	Default
Subst	Microstrip substrate name	None	MSub1
F	Center frequency	GHz	1
Zo1	Characteristic impedance of input port 1	Ohm	50
Zo2	Characteristic impedance of output port 2	Ohm	50
Zo3	Characteristic impedance of output port 3	Ohm	50
K	Ratio of power out port 2 to power out port 3	None	1.0
Delta	Length added to quarter-wave sections for tuning performance	mil	0

Notes

1. A tee power divider splits the power at the input (pin 1) between the two outputs (pins 2 and 3). Unequal or equal power splits can be realized. The input port will be matched to its feeding line, although in general the output ports will not be matched.
2. The value of K can be set to realize the desired power split out of ports 2 and 3. However, choosing K larger than 3 to 4 (or smaller than 1/3 to 1/4) can cause the ratio of the widths of the tee branches to violate the range of the MTEE simulation model. While the simulation will still proceed, the results can have some inaccuracies.
3. Quarter-wave matching sections are provided on the output ports to ensure a proper power split is achieved.
4. The optimization minimizes the input reflection coefficient (S11) at the design center frequency by changing the length of the quarter wave transformers on the output legs.
5. A SmartComponent subnetwork is empty until the Design Assistant is used to generate the design. Refer to Design Assistant.

For a more detailed discussion of this device, see: D. M. Pozar, Microwave Engineering, 2nd Edition, John Wiley & Sons: New York, 1998, pp. 360-361.

Example

A tee power divider was designed for a center frequency of 1 GHz with an unequal power split (K=3.5). Tuning using the Optimization Assistant yielded a value of Delta = -34.633 mil.