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Related Experiment Video

Updated: Jun 24, 2026

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Published on: December 15, 2021

High-power millimeter-wave rotary joint.

T H Chang¹, B R Yu

¹Department of Physics, National Tsing Hua University, Hsinchu 300, Taiwan. thschang@phys.nthu.edu.tw

The Review of Scientific Instruments

|April 2, 2009

Summary

This summary is machine-generated.

This study presents an ideal rotary joint for microwave and terahertz applications. The designed TE(01) mode converter rotary joint achieves 97% transmission and operates reliably up to 210 W.

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Area of Science:

Microwave Engineering
Electromagnetics
Component Design

Background:

Rotary joints are critical microwave components connecting fixed and rotating parts.
Interface discontinuities in rotary joints can significantly impact signal transmission.
Traditional rotary joints face challenges with signal integrity and power handling.

Purpose of the Study:

To systematically analyze the impact of interface discontinuities on various waveguide modes in rotary joints.
To design, fabricate, and test a novel rotary joint utilizing the TE(01) mode for superior performance.
To evaluate the transmission characteristics, bandwidth, and power handling capabilities of the developed rotary joint.

Main Methods:

Systematic simulation of waveguide modes at the rotary joint interface.
Design and fabrication of a rotary joint based on two identical TE(01) mode converters.
Back-to-back transmission measurements to validate simulation results.
High-power experiments to assess operational limits.

Main Results:

The TE(01) mode transmission was found to be independent of joint geometry, making it ideal for rotary applications.
The fabricated rotary joint achieved an optimum transmission of 97% with an 8.5 GHz bandwidth centered at 35.0 GHz.
The device demonstrated rotation angle independence and operated successfully up to 210 W peak input power at 18% duty.

Conclusions:

The TE(01) mode rotary joint offers excellent performance and is suitable for millimeter-wave and terahertz frequencies.
The design overcomes the critical joint gap issue prevalent in higher frequency applications.
This technology provides a robust solution for high-power, wide-bandwidth rotary joint requirements.