*Question E9E08:
What is a use for a Wilkinson divider?*  

*Correct Answer is  C: To divide power equally between two 50-ohm loads while maintaining 50-ohm input impedance*  

### AI Response: (may contain errors)  

A Wilkinson divider is a specific type of power divider used in RF and microwave applications. Let's break down why the correct answer is correct and why the other choices are incorrect.

### Correct Answer: C
**To divide power equally between two 50-ohm loads while maintaining 50-ohm input impedance**

- **Explanation**: A Wilkinson divider is designed to split an input signal into two equal output signals while maintaining the same impedance at the input and outputs. It is specifically used to divide power equally between two loads, typically 50-ohm loads, which is common in RF systems. The divider also provides isolation between the output ports, which is a key feature.

### Incorrect Choices:

- **A: To divide the operating frequency of a transmitter signal so it can be used on a lower frequency band**
  - **Explanation**: This choice describes a frequency divider, not a power divider. A frequency divider reduces the frequency of a signal, which is not the function of a Wilkinson divider.

- **B: To feed high-impedance antennas from a low-impedance source**
  - **Explanation**: This choice describes an impedance transformer or matching network, which is used to match different impedances. A Wilkinson divider is not used for impedance transformation between high and low impedances.

- **D: To divide the frequency of the input to a counter to increase its frequency range**
  - **Explanation**: Similar to choice A, this describes a frequency divider, which is used to reduce the frequency of a signal for measurement purposes. A Wilkinson divider does not perform frequency division.

### Key Points:
- **Impedance Matching**: The Wilkinson divider maintains a 50-ohm impedance at all ports, which is crucial for minimizing reflections in RF systems.
- **Isolation**: It provides isolation between the output ports, which prevents interaction between the loads connected to each port.

Understanding the specific function of a Wilkinson divider helps in identifying its correct application in RF systems.