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The new QRP small ring antenna short wave radio small ring antenna full high Q value 20 watts - AliExpress
Design, simulation, and fabrication of a double annular ring microstrip antenna based on gaps with multiband feature - ScienceDirect
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Stonex SA1800 3D choke ring antenna | Lowest price online | Global GPS Systems
Design of a differential driven shorted annular ring antenna
Broadband high gain coupled and cascaded circular ring antenna - Yadav - 2021 - International Journal of RF and Microwave Computer-Aided Engineering - Wiley Online Library