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Abstract: In this letter, a dual-band rotational feed circularly polarized (CP) antenna array is proposed. The dual-band antenna element consists of two pairs of symmetric dipoles. The low-frequency ...

This is a cheap option to implement an Activ-IoTy compatible checkpoint. Athletics events are usually controlled by officials with different roles such as: judges, timekeepers and starters. Other ...

Product link: https://www.elecrow.com/esp32-display-series-hmi-touch-screen.html Code link: https://github.com/Elecrow-RD/CrowPanel-ESP32-Display-Course-File ...