Salaudeen K. OlawaleSani SaminuYahya A. SuleimanMuniru O. IdrisAdisa Y. Adebayo2026-08-272026-08-272026Salaudeen, K.O. Saminu, S. Yahaya, S.A. Muniru, I. O. Adisa, Y.A. Jabire, A.H. (2026): Design and Performance Analysis of a Tissue-Load Stable H-Slotted Patch Antenna for 2.45 GHz Breast Phantom Sensing Applications. Centrepoint Journal (Science Edition). 30(2), 42-542141-3819https://uilspace.unilorin.edu.ng/handle/123456789/18521The detection of solid tumors, especially in the breast, is crucial to improving patient outcomes and minimizing the side effects of cancer treatment. This study presents a highly miniaturized rectangular H-slotted PIFA operating in the 2.45 GHz ISM band; the design incorporates an H-shaped slot on top of the radiating patch to reduce the antenna size and improve current-path meandering. Simulation results from CST Studio Suite indicate that the proposed design resonates at 2.45 GHz with a -10 dB impedance bandwidth of approximately 277 MHz (2.33 – 2.61 GHz), a record Return Loss (S11) of -51.65 dB, and a VSWR of 1.005 in free-space conditions, demonstrating a near-perfect impedance match. The antenna exhibits a realized gain of 3.5 dBi at 70% efficiency. and a directional radiation pattern with a directivity of 4.16 dBi, enabling effective electromagnetic energy penetration into breast tissues. The antenna was also shown to be stable in its resonant frequency while modeled within a three-layered breast phantom model (skin-fat-gland). The presence of a 5 mm malignant tumor produces a noticeable shift in the reflection coefficient from -51.65 dB to -39.20 dB, demonstrating the antenna’s sensitivity to dielectric-property variations between healthy and cancerous tissues. Finally, a maximum 1-g averaged specific absorption rate (SAR) of 0.103 W/kg at 10 mW input was achieved, which is substantially below the FCC safety limit of 1.6 W/kg. The results demonstrate that the proposed H-slotted antenna is a compact and stable sensor with the capability to detect early-stage breast tumors effectivelyenBreast Cancer detectionMicrowave imagingSARPatch AntennaISM Band.Article