|
Introduction
Microwave circuit simulation is an integral part of design of microwave
devices. Using full-wave EM simulation is not a good option for the
starting calculations because it involves usage of great amount of
memory and requires considerable simulation time. Thus, in circuit
solvers, circuit elements are often modeled by predefined closed-form
library components whose characterization is performed faster than the
full wave EM simulation. Although closed-form models have their
drawbacks, in many cases using them is enough, or at least it gives a
good estimate on the system performance early on in the design process.
WIPL-D Microwave
WIPL-D Microwave is a software package which serves as fast and accurate
design and simulation tool for projects involving microwave circuits,
components and antennas. It is integrated with WIPL-D EM solver, WIPL-D
Optimizer and WIPL-D Time Domain Solver. Its user-friendly schematic
capture allows easy circuit modeling, inclusion of user-defined EM
component models, and import of data in Touchstone format. Component
library includes closed-form and 3D EM models in four implementation
technologies:
• Microstrip,
• Coplanar waveguide,
• Rectangular waveguide,
• Coaxial,
In addition, lumped elements and many idealized device models are
available in the library.
WIPL-D Microwave can be used to develop complex structures such as:
• RF and microwave filters,
• Matching structures,
• Resonators,
• Directional couplers,
• Power dividers,
• Connectors.
Simulation Examples
Microwave circuits shown in Figs 1-3 are analyzed using WIPL-D
Microwave.
The circuit shown in Fig. 1 is implemented in rectangular waveguide
technology. It is a single-stub tuner which is used to match the circuit
at 10 GHz. S11 parameter of the circuit is shown in Fig. 2.
|
Figure 1. Single-stub tuner with
rectangular waveguides |
Figure 2. S11 parameter for the
stub tuner |
The circuit shown in Fig. 3 is a diplexer
implemented in microstrip technology, intended to operate in 2 GHz and
2.2 GHz bands. Its S11 and S21 parameters are shown in Fig. 4.
|
Figure 3. Diplexer |
Figure 4. S parameters for the
diplexer |
The circuit shown in Fig. 5 is a
Chebyshev impedance transformer implemented in coaxial technology
designed to operate as a matching circuit in a wide band: from 2 GHz up
to 8.5 GHz. Its S11 parameter is shown in Fig. 6.
|
Figure 5. Coaxial Chebyshev
impedance transformer |
Figure 6. S11 parameter for
Chebyshev impedance transformer |
Conclusion
WIPL-D Microwave is a suitable tool for simulation of microwave circuits
thanks to it user-friendly schematic capture, a library of components
with several types of models (ideal, closed-form, EM) and a dynamic link
with the 3D EM solver.Three simple examples were presented here in order
to show that WIPL-D Microwave can be a useful tool for circuit
simulation even if no EM simulation is required.
Download PDF |
