CST – Computer Simulation Technology

High-Power Coax-to-waveguide Transition

Image of the High-power coax-to-waveguide transition Image of the High-power coax-to-waveguide transition

The high power coax-to-waveguide coupler employs a T-bar type transition to prevent arcing, while maintaining good bandwidth. A coaxial connector is mounted on the center-line of the waveguide broad wall with its bare center pin extending into the guide. The center pin meets the T-bar, whose diameter steps down toward the waveguide walls.

The rule of thumb for a good transition, is achieving a transmission coefficient of better than -0.1 dB across the band. This particular design typically achieves that across the simulated 40% bandwidth, depending on the choice of waveguide dimensions. Custom waveguide dimensions may be specified as part of the design objectives.

Typical reflection (S11) and transmission (S21) performance of the device Typical reflection (S11) and transmission (S21) performance of the device
Image of the High-power coax-to-waveguide transition Image of the High-power coax-to-waveguide transition

The high power coax-to-waveguide coupler employs a T-bar type transition to prevent arcing, while maintaining good bandwidth. A coaxial connector is mounted on the center-line of the waveguide broad wall with its bare center pin extending into the guide. The center pin meets the T-bar, whose diameter steps down toward the waveguide walls.

The rule of thumb for a good transition, is achieving a transmission coefficient of better than -0.1 dB across the band. This particular design typically achieves that across the simulated 40% bandwidth, depending on the choice of waveguide dimensions. Custom waveguide dimensions may be specified as part of the design objectives.

Typical reflection (S11) and transmission (S21) performance of the device Typical reflection (S11) and transmission (S21) performance of the device

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