研究目的
To present a tunable narrowband substrate integrated waveguide (SIW) cavity-based quadrature hybrid coupler for high-performance applications with wide spurious-free range, low-power consumption, and high-power handling capability.
研究成果
The proposed tunable quadrature hybrid coupler achieves a 69% tuning range from 1.32 GHz, with low insertion loss, high isolation, wide spurious-free range, low power consumption, and high power handling capability, making it suitable for narrowband moderate high-power applications.
研究不足
The simulations do not perfectly match measurements due to higher external quality factor in the fabricated coupler, leading to deviations in matching, isolation, and phase difference. The tuning range and performance may be limited by fabrication tolerances and material properties.
1：Experimental Design and Method Selection:
The design employs four high-Q SIW evanescent-mode cavity resonators tuned with piezoelectric actuators. The coupling scheme is analyzed using even- and odd-mode analysis, with coupling coefficients and external quality factor derived from equivalent circuits. Software tools like ADS and HFSS are used for simulation and optimization.
2：Sample Selection and Data Sources:
A 60-mil-thick substrate (RO4003C) is used for fabrication. The coupler is fabricated using a commercial milling and plating system.
3：List of Experimental Equipment and Materials:
Substrate (RO4003C, Rogers Co.), piezoelectric actuators (T216-A4NO-273X, Piezo Systems), silver disk, silver epoxy, Parylene-N-layer, milling and plating system.
4：Experimental Procedures and Operational Workflow:
The coupler is fabricated, and S-parameters are measured at different tuning states (beginning, middle, end of tuning range). Measurement procedures follow those detailed in reference [7].
5：7]. Data Analysis Methods:
5. Data Analysis Methods: S-parameters, insertion loss, fractional bandwidth, phase error, amplitude imbalance, reflection, isolation, and spurious-free range are analyzed from measured and simulated data.
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substrate
RO4003C
Rogers Co.
Used as the base material for fabricating the coupler, providing the structural and electrical properties needed for the SIW design.
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Advanced Design System software
ADS
Keysight Technologies
Used for optimizing coupling coefficients and simulating the coupler design.
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piezoelectric actuator
T216-A4NO-273X
Piezo Systems
Used to tune the resonators in the coupler, allowing frequency adjustment with low power consumption and high force.
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silver disk
Attached to the piezoelectric actuator for tuning, part of the resonator structure.
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silver epoxy
Used to attach the silver disk to the piezoelectric actuator, ensuring electrical and mechanical connection.
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Parylene-N-layer
Coated on the top of each post to prevent shorting with the silver disk, providing insulation.
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milling and plating system
Used for fabricating the coupler, involving machining and metal deposition processes.
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High-Frequency Structure Simulator software
HFSS
ANSYS
Used for 3D simulation and optimization of the coupler structure.
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