AWR Microwave Office Microwave & Millimetrewave Electronics

Discuss the importance of impedance matching to maximize the transfer of power through a system.
PART A
1. Maximizing Power Transfer:
1. State the Maximum Power Transfer Theorem.
2. For the circuit below, find the impedance ?? that will match the load ?? = ?? +
???? to the generator ?? = 50 Ω at frequency ? = 2 GHz.

2. An RC load with an impedance of?? = 100 − ?50 Ω must be matched to a 50 Ω line at a frequency f0 = 1.393 GHz, Find an impedance matching circuit based on the following techniques:
1. Using either calculator, programming languages, and/or Smith Charts: L-section impedance n.
matching (LC lumped elements).

2. Using Smith Charts (scan into report or hand in during class): Single-stub tuning (use open-
circuit shunt stubs).
3. Using MATLAB or any other programming tools (include code in report): Quarter- wave
transformer. Note: perfect matching will not be achieved. Explain why and calculate the
reflection coefficient Γ.

PART B
Simulate in AWR the three cases above using either microstrip transmission lines or relevant LC
lumped elements. A lumped element component can also be used to create the load.

PART C
In this lab Smith Charts will be demonstrated as a means of visually testing the impedance
matching properties of various structures and devices.
Describe how the Smith Chart setting on a VNA was used to explore impedance matching of an
antenna.

PART D
CONCLUSION