Waveguide switches play a critical role in modern microwave and millimeter-wave systems. As frequency demands continue to increase in radar, satellite communications, and test systems, designers rely on waveguide switches to ensure precise signal routing, minimal loss, and high reliability. AO Microwave, as a leading RF & microwave solutions provider, offers a complete series of waveguide switches covering 5.85 GHz to 110 GHz, supporting a wide range of professional applications.

1. What Is a Waveguide Switch?

A waveguide switch is a device that redirects microwave or millimeter-wave energy between different waveguide paths. By mechanically or electromechanically changing the internal signal route, the switch enables systems to toggle between multiple channels, antennas, or test configurations.

Waveguide switches are valued for:

• Extremely low insertion loss

• High isolation

• Excellent power handling

• Superior performance stability at high frequencies

These advantages make them indispensable in high-precision RF systems.

2. Key Functions of Waveguide Switches

A. Signal Routing / Path Control

The primary function of a waveguide switch is to route signals from one waveguide line to another. This is essential in multi-channel or multi-band systems, where a single signal source needs to be distributed to different outputs.

B. Redundancy Switching

In mission-critical systems such as satellite communication, a waveguide switch ensures uninterrupted operation by switching between primary and backup modules.
This enhances system reliability and prevents downtime.

C. Antenna Selection

Waveguide switches allow a system to connect to different antennas depending on the operational mode, frequency band, or field conditions.
For radar and EW systems, this capability is essential for flexible deployment.

D. Test and Measurement Automation

In laboratory environments, waveguide switches are used to automatically select test paths, allowing engineers to route signals to different DUTs (Devices Under Test) without manually reconnecting waveguides.
This improves test efficiency, repeatability, and safety.

3. Typical Applications of Waveguide Switches

Waveguide switches from AO Microwave are widely used across several high-frequency fields:

Radar Systems

• T/R module routing

• Antenna switching

• Multi-channel radar path selection

Radar systems demand high power capability and extremely stable switching — areas where waveguide switches excel.

Satellite Communication

• Uplink/downlink redundancy switching

• Payload reconfiguration

• Multi-band gateway systems

The reliability of AO Microwave waveguide switches ensures long-term performance even in harsh environments.

Electronic Warfare & Defense

• Fast switching between threat detection channels

• Jammer and receiver path selection

• Mission profile reconfiguration

High isolation and robustness make waveguide switches suitable for EW systems.

Millimeter-Wave Measurement Systems

• Automated test benches

• Vector network analyzer extension modules

• Component validation and verification

Waveguide switches enable automated, accurate measurement setups from 5.85–110 GHz.

4. AO Microwave’s Full Series of Waveguide Switch Products

AO Microwave provides a comprehensive portfolio covering:

• WR137 to WR10 waveguide sizes

• Frequency range: 5.85 GHz – 110 GHz

• Configurations:

  • SPDT (Single-Pole Double-Throw)

  • DPDT (Double-Pole Double-Throw)

  • Multi-throw versions on request

• Actuation types:

  • Electromechanical

  • Manual

  • Latching and failsafe options

Each product is designed for:

• High isolation

• Low VSWR

• Precision alignment

• Long operational lifetime

Custom designs and application-specific models are also available.