CST – Computer Simulation Technology

Coax Circular Waveguide Transition

Image of the Coax circular waveguide transition. Image of the Coax circular waveguide transition.

Although coaxial to rectangular waveguide transitions are far more common than coaxial to circular waveguide transitions, circular waveguides are easier to manufacture, implement and is often used to feed conical horns. In radar applications where rotary joints are used a circular cross section is necessary.

The circular waveguide can be matched to a coaxial line for a range of impedances by the appropriate choice of probe height and inset from the waveguide's short-circuited end.

The circular waveguide's dominant mode is the TE11 mode with a maximum practical bandwidth of 12.4 % due to cutoff frequency of the TM01 as the coaxial feed does also excite the TM01 mode.

The figures below show the reflection and transmission coefficients for a 50 Ohm design....

Typical reflection coefficient versus normalized frequency. Typical reflection coefficient versus normalized frequency. Typical transmission coefficients versus normalized frequency. Typical transmission coefficients versus normalized frequency.

Rate this Article

0 of 5 Stars
5 Stars
0%
4 Stars
0%
3 Stars
0%
2 Stars
0%
1 Stars
0%
contact support

Your session has expired. Redirecting you to the login page...

We use cookie to operate this website, improve its usability, personalize your experience, and track visits. By continuing to use this site, you are consenting to use of cookies. You have the possibility to manage the parameters and choose whether to accept certain cookies while on the site. For more information, please read our updated privacy policy


Cookie Management

When you browse our website, cookies are enabled by default and data may be read or stored locally on your device. You can set your preferences below:


Functional cookies

These cookies enable additional functionality like saving preferences, allowing social interactions and analyzing usage for site optimization.


Advertising cookies

These cookies enable us and third parties to serve ads that are relevant to your interests.