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A Compact Broadband Power Combiner for High-Power, Continuous-Wave Applications
Zihan Yang1, Qiang Zhang1, Kelin Zhou1
1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.
Micromachines
|February 24, 2024
Summary
A novel sixteen-way radial-line waveguide combiner efficiently synthesizes microwave signals for solid-state power sources. This compact device offers high power capacity and low insertion loss, crucial for advanced RF applications.
Area of Science:
- Microwave Engineering
- Electromagnetics
- RF Power Amplification
Background:
- Solid-state power sources require efficient multi-way power synthesis.
- Existing combiners often face limitations in power handling, bandwidth, and insertion loss.
Purpose of the Study:
- To design and experimentally investigate a compact, high-power, broadband combiner.
- To achieve efficient power synthesis for sixteen microwave terminals.
Main Methods:
- Design based on a radial-line waveguide for circumferential symmetry.
- Simulation and experimental verification of performance metrics.
- High-power continuous wave (CW) testing.
Main Results:
- Achieved a relative bandwidth of ~34.6% (2.06-2.93 GHz) with reflection coefficient S1,1 < -20 dB.
- Demonstrated phase imbalance of ±4.5° and 16-way transmission coefficient around -12.0~-12.3 dB at 2.45 GHz.
- Verified handling of at least 3.9 kW CW power without active cooling.
Conclusions:
- The designed radial-line waveguide combiner is suitable for high-power microwave applications.
- Its compact size, broadband operation, and high power capacity are advantageous for solid-state RF sources.
- Further cooling measures can significantly enhance its power handling capabilities.
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