In this article. a compact dual-band. 2-elements antenna-diplexer is investigated and extended to a $2\times 2$ multi-input and multi-output (MIMO) antenna. The proposed design employs half-mode Substrate Integrated Waveguide (HMSIW) technology. https://www.balboasurfandsstylers.shop/product-category/womens-l-s-crop-tee/