Gasket-D Type
RF Waveguide Gasket ensures reliable sealing and electrical continuity between waveguide flanges. Essential for maintaining low leakage and stable RF performance in microwave systems, radar equipment and satellite communication hardware.
High-Shielding D-Type Gaskets for Waveguide and EMI Protection
AO Microwave’s high-performance D-type gaskets are engineered to deliver reliable environmental sealing alongside robust electromagnetic interference (EMI) shielding across rectangular waveguide flange interfaces. Fabricated from premium, metal-filled elastomers with a specialized "D" cross-section—utilizing conductive silicone or fluorosilicone compounds filled with silver-plated aluminum, silver-plated copper, or nickel-graphite particles—our D-type gaskets achieve low contact resistance across the joint. These gaskets provide an outstanding shielding effectiveness of typically > 100 dB up to 40 GHz, preventing RF leakage and shielding sensitive receiver components from external EMI.
By utilizing the "D" geometry, our gaskets establish a flat contact surface at the base while the rounded top compresses easily to seal surface irregularities. They are essential for ruggedized military transceivers, airborne radar compartments, and high-shielding communication enclosures.
| Part No | Waveguide Type | Dimension (AXBXC)/mm | Material |
|---|---|---|---|
| AO650-MFD | WR650 | 174.8X92.2X5 | Silicon 70deg Shore |
| AO510-MFD | WR510 | 136X72X5 | Silicon 70deg Shore |
| AO430-MFD | WR430 | 117X63X5 | Silicon 70deg Shore |
| AO340-MFD | WR340 | 94X51.5X5 | Silicon 70deg Shore |
| AO284-MFD | WR284 | 79.4X41.3X3.5 | Silicon 70deg Shore |
| AO229-MFD | WR229 | 63X34.5X3.5 | Silicon 70deg Shore |
| AO187-MFD | WR187 | 53.9X28.5X3.5 | Silicon 70deg Shore |
| AO159-MFD | WR159 | 45.5X25.5X3.5 | Silicon 70deg Shore |
| AO137-MFD | WR137 | 41.2X22.2X3.5 | Silicon 70deg Shore |
| AO112-MFD | WR112 | 34.9X19X3.5 | Silicon 70deg Shore |
| AO90-MFD | WR90 | 28X15.5X3.5 | Silicon 70deg Shore |
| AO75-MFD | WR75 | 24.5X15X3.5 | Silicon 70deg Shore |
| AO62-MFD | WR62 | 20.5X12.5X3.5 | Silicon 70deg Shore |
| AO51-MFD | WR51 | 17.8X11.4X3.5 | Silicon 70deg Shore |
Tuning & Compression Benefits of the D-Profile
Gaskets require proper compression to establish a secure seal without being damaged. D-type gaskets utilize a specialized "D" cross-section to optimize mechanical compression.
The flat base of the D-profile ensures a secure seat inside the flange groove, preventing twisting or displacement during assembly. The rounded top compresses easily under lower bolt torque than flat gaskets, establishing continuous contact that seals surface irregularities and prevents EMI leakage. AO Microwave's D-type gaskets are designed with high resilience to maintain reliable shielding over time.
Target Applications & Operational Advantages
By providing concurrent environmental sealing and EMI shielding, our D-type gaskets deliver critical performance in active systems:
Military Avionics Enclosures
Function: Seals waveguide-to-housing interfaces on airborne radar modules.
Advantage: Exceptional shielding effectiveness (>100 dB) prevents internal RF fields from interfering with sensitive avionics.
Shipboard Fire-Control Radars
Function: Seals waveguide flange joints against saltwater spray, rain, and humidity on sea vessels.
Advantage: Nickel-graphite filled fluorosilicone resists galvanic corrosion and exposure to fuel and salt, maintaining sealing performance.
EMI-Shielded Communication Enclosures
Function: Seals cabinet panels and waveguide ports in high-density base stations.
Advantage: Low closure force requirements enable secure environmental and EMI sealing under lower bolt torque.
Gasket-D Type FAQs
Need high-shielding D-Type Gaskets?
Specify your WR size, material (Conductive Silicone/Fluorosilicone), shielding requirements, and quantity — we'll quote in 24 hours.
