Waveguide Gaskets: Types, Features & Selection

Waveguide gaskets, though small, are crucial for ensuring proper sealing in waveguide joints. They prevent leaks and minimize signal loss. This guide highlights their types, materials, and applications in various RF systems. We’ll cover the basics, different types, and a selection guide, including functions and benefits.

What is a Waveguide Gasket?

A “gasket” is a specially designed structure used to join two waveguide flanges together. Because it’s used for waveguides, it’s known as a waveguide gasket. Figure 1 illustrates this. Materials like CHO-SEAL 1212 and CHO-SEAL 1239 are commonly used.

Figure 1: Waveguide gasket

Waveguide gaskets are available for standard UG, CMR, and CPR flange types.

Types of Waveguide Gasket

Here are the common types of waveguide gaskets, categorized by size and shape:

• Die-cut rectangular
• Die-cut circular
• Molded rectangular, with “O” cross-section
• Molded circular, with “O” cross-section (O-rings)
• Molded circular, with “D” cross-section (D-rings)
• Molded rectangular, with … (The original article appears to have an incomplete sentence here. More information would be needed to complete it.)

Based on function, there are two main types:

• Pressure Seal: Uses a non-conductive gasket.

  • Designed to fit into flange grooves.
  • Made of silicon or neoprene.
  • Typically comes in O-ring or rectangular shapes.

• Pressure and RF Seal: Uses a conductive gasket.

  • Filled with conductive material.
  • Made of copper or silver.

Functions and Benefits of Waveguide Gasket

Waveguide gaskets offer several functional benefits:

• Provides effective EMI Shielding and pressure sealing for covers, flanges, and chokes.
• Ensures low RF signal loss during transmission and minimizes signal leakage at waveguide joint sections.
• Ensures maximum heat transfer with minimal outgassing.

Selection Guide for Waveguide Gasket

Consider these technical specifications when selecting a waveguide gasket:

• Frequency Band of operation (Ka, K, Ku, X, X1, Xb, C, S, W, L)
• Size and shape of the gasket
• Type of flanges (UG, CPR, CMR)
• Functionality: Conductive (Pressure & RF seal) or non-conductive (Pressure seal only)

Conclusion

Waveguide gaskets are vital for maintaining system efficiency by preventing leakage and ensuring durability. Selecting the correct gasket enhances RF system performance.