This Letter presents a dual polarised monostatic patch antenna with a simple two‐tap RF/analogue domain‐based self‐interference cancellation (SIC) (RF‐SIC) circuitry to achieve high interport isolation in a comparatively wider bandwidth for a 2.4 GHz in‐band full duplex wireless transceiver. A brief mathematical description for the deployed two‐tap RF‐SIC is also presented to provide insight into self‐interference (SI) suppression in a comparatively wider bandwidth. The implemented antenna with a two‐tap RF‐SIC circuitry achieves around 80 dB T x –R x isolation for a 20 MHz bandwidth in addition to more than 90 dB peak isolation for measurements performed in a lab environment where SI may result from the nearby placed objects. The deployed two‐tap RF‐SIC circuit can be tuned to effectively cancel out SI caused by reflections of the radio signal from the surroundings. Moreover, an 80 dB isolation bandwidth can be tuned within a 10 dB return loss bandwidth of the implemented dual polarised antenna.