A 4-way Wilkinson splitter is commonly used to achieve 20 dB isolation.

For achieving 20 dB isolation, a Wilkinson power splitter is typically recommended. For example, the MICROLAB/FXR 694-2700 4-way Wilkinson splitter provides 20 dB isolation with 0.9 dB insertion loss and supports up to 50 W of power, using N-type female connectors .

Key Considerations

• Number of Outputs: The isolation rating is often specified per output. A 4-way splitter divides the input signal into four outputs while maintaining the desired isolation between ports .
• Insertion Loss: Even with 20 dB isolation, expect a small insertion loss (typically <1 dB for high-quality splitters) which slightly reduces output power .
• Connector Type: Ensure compatibility with your system; common types include N-type, SMA, BNC, and F-type .
• Frequency Range: Verify the splitter supports your operating frequency. Wilkinson splitters are available for a wide range, from MHz to tens of GHz .
• Power Handling: Check the maximum power rating to avoid damage; the example splitter handles up to 50 W .

Alternative Options

• 2-way or 3-way splitters: If fewer outputs are needed, 2-way or 3-way splitters can also provide high isolation, but the isolation may vary depending on design .
• Custom or higher-port splitters: For more complex systems, splitters with 6, 8, or more outputs are available, still capable of 20 dB isolation . In summary, for 20 dB isolation, a 4-way Wilkinson splitter is a standard choice, balancing isolation, insertion loss, and power handling, but the exact number of outputs and connector type should match your system requirements .