研究目的
To study the energy recovery in microstrip passive circuits from the power losses into heat using a thermoelectric generator (TEG) based on the Seebeck effect principle.
研究成果
The paper demonstrates that a notable amount of power can be recovered from microwave passive components working under moderate power signals by using a TEG based on the Seebeck effect principle. A proof-of-concept device consisting of a bandpass filter for WiMAX applications integrated with a TEG system was fabricated and characterized, showing that 245 μW can be continuously supplied to the load for a CW signal power of 2 W at 3.48 GHz. Future research may improve the recovered power by increasing the heat flux through the TEG or by choosing an appropriate arrangement involving the metal housing.
研究不足
The efficiency of commercial TEGs is usually lower than 1%, and the thermal impedance matching condition is difficult to meet for TEG due to its small thermal resistance in comparison to commercial heat sinks used for electronic applications.
1：Experimental Design and Method Selection:
The study involves the integration of a TEG with a microstrip circuit to convert dissipated power into heat to DC electrical power. Design guidelines are provided to optimize recovered power while maintaining good isolation between the RF signal and the TEG system.
2：Sample Selection and Data Sources:
A third-order bandpass filter for WiMAX applications is used as a demonstrator circuit. The substrate used is Megtron 6 from Panasonic.
3：List of Experimental Equipment and Materials:
The TEG used is the TGP-651 from Micropelt. The setup includes a high power measurement setup, digital multimeter, and infrared camera model SC7600BB from FLIR Systems.
4：Experimental Procedures and Operational Workflow:
The thermal and electrical characterization of the integrated device is performed under different scenarios, varying the heat sink and operation frequency. The input power is fixed at 2 W for all situations.
5：Data Analysis Methods:
The power loss into heat by the microwave circuit is calculated, and the efficiency of the proposed integrated device is defined and computed from the measurement results.
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