Numerical and experimental generated data during project https://doi.org/10.1038/s41598-025-19415-7

The dataset was generated during a project aimed at developing a novel a self-duplexing circularly polarized implantable (SDCPI) antenna for wireless capsule endoscopy (WCE) application having two separate ports, with port 1 providing a wideband response covering MICS (402 MHz), ISM (433 MHz) band, and port 2 covering ISM (915 MHz) band. The proposed SDCPI antenna achieved a very compact volume of π × (5.1)2 × 0.127 = 10.3 mm3 by semi-circular slots on the radiating patch and shorting pins. The proposed capsule integrated implantable antenna was thoroughly analyzed through simulations in various parts of the digestive tract (stomach, small intestine, and colon) and was later fabricated and tested. The measurements were carried out in minced pork, and the results obtained showed close resemblance to the simulated results. The proposed SDCPI antenna offers a -10 dB impedance bandwidth and CP bandwidth of 151 and 273 MHz, and 10% and 15% at 402 and 915 MHz, respectively. Furthermore, it exhibits measured gain of -36 and − 25 dBi at 402 and 915 MHz, respectively. To evaluate the human safety of the proposed SDCPI antenna, specific absorption rate (SAR) at 402 and 915 MHz was estimated in the stomach, small intestine, and colon, and was found to be within the limits allowed by the IEEE standards.