Modeling of Microstrip Circuits

6-Way Divider – Modeling
and Analyzing in WIPL-D Pro

Matching Network Design
for Power Amplifiers

Power Detector with a
Zero-Bias Schottky Diode

Wilkinson Combiner/Divider
at High MW Frequencies

6-Way Divider – Modeling and Analyzing in WIPL-D Pro

In this application, we will analyze 6-way divider. The divider will be simulated from 1.4 GHz to 1.6 GHz. The results of interest will be s11, s21, s31… s71 parameters.

Feeding port is marked using number 1 while other 6 ports are marked using numbers 2-7. The divider is fed by probe with SMA connector (Figure 2).


Figure 1. Layout of the divider.


Figure 2. SMA connector on the first port.

Modeling


Figure 3. Table of symbols.

In WIPL-D, there are procedures for modeling the divider:

  • by using WIPL-D own tool (defining symbols, nodes, creating plates…)
  • by using WIPL-D own tool (defining symbols, grids; creating plates…)
  • by using AW Modeler for importing .dxf file
  • by using WIPL-D Pro CAD for importing .x_t, .stp, .sat, .iges…

The first procedure will be presented in this paper. It is very simple, but it takes a bit more time than the other procedures. Nevertheless, with this procedure we can obtain optimal mesh and minimize simulation time.

All dimensions are given using symbols. Table of symbols is presented in Figure 3.

Layout of the Wipl-D model and clarifications of some symbols are shown in Figure 4.


Figure 4. Layout of Wipl-D model.

Feeder on the port 1 is modeled as coaxial line using Wipl-D objects (BoR and Circle). Specifications of BoR and Circle objects are presented in Figures 5-6.


Figure 5. Specification of a BoR object.


Figure 6. Specification of Circle object.

Feeder attached to the first port is shown in the Figure 7.

Feeders on the other ports (ports 2-7) are the same. Model of this feeder is shown in Figure 8.


Figure 7. Coaxial feeder on the first port.


Figure 8. Feeder on the port 2.

Simulation settings

Frequency range mentioned above (1.4 GHz to 1.6 GHz) was divided into 11 frequency points. Operation mode ANTENNA (One generator at time) is chosen.

As we can see from Figure 1 and Figure 3, model is symmetrical versus x0z plane. Anyway, we simulated the whole model.

Simulation Results

Table 1. Simulation time and number of unknowns.

Simulation time per frequency Number of unknowns
99 sec 2487

The simulation was carried out on Intel® Core™ 2 Quad 64 bit processor (2.66 GHz) with 4 GB of RAM. The tool used for simulation is WIPL-D Pro on Windows XP platform.

Magnitude of s11 (in dB) parameters is shown in Figure 9.


Figure 9. Magnitude of S11 parameters.

Results for the other parameters of interest are shown in Figures 10-11. Because of symmetry of the structure, parameters s21 and s31, s41 and s51 and finally, pair of s61 and s71 are with the same values. Thus, only parameters s21, s41 and s61 are displayed here.


Figure 10a. Parameter s21 – magnitude.


Figure 10b. Parameter s11 – phase.


Figure 11a. Parameter s41 – magnitude.


Figure 11b. Parameter s41 – phase.


Figure 12a. Parameter s61 – magnitude.


Figure 12b. Parameter s41 – phase.

PDF application note

If you have a specific problem in mind and you are not sure if WIPL-D software can handle that problem, contact us. We will analyze your needs and try to help, and if our products satisfy your requirements, we will make you the best possible offer for purchase.