Disclosed herein is a novel antenna device design that could be applied in hand-held radio band remote controls for devices. Accordingly, the antenna structure uses a unique ground cut-out and capacitive coupling to the ground structure on a PCB that includes a button located on the other side of the antenna. The design utilizes the close proximity of the battery and battery terminal as part of the antenna structure and their relative placement could be tuned to maintain performance. Further, the selection of inductive chokes for the button control pins allows the antenna to continue to operate without significant degradation to radiated efficiency. The design includes comparable performance while in free space as well as when hand-held. Because of the exact placement of the radiating structures, hand holding does not cause the antenna center frequency to detune as seen with other designs.
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Mei, Vincent and Bevelacqua, Peter, "Single Band Antenna For Ism Remote Controls", Technical Disclosure Commons, (May 08, 2017)