<p>This paper proposes a small electrically implantable antenna with incorporated the slot-stub techniques for neural recording and stimulation The proposed antenna consists of a printed monopole CPW-fed antenna with a compact size of 10 × 10 × 1.6 mm³. The slots and stubs techniques are used to achieve the fully ultra-wideband impedance bandwidth. The antenna is analyzed in the presence of air and heterogeneous multilayer tissues of adult head and child head (created by their electrical properties) in Ansys HFSS software for the first time, as per the author’s best knowledge. The antenna is fabricated, and measurements are performed in air and chicken meat. The simulated and measured fractional bandwidth percentage of antenna are 132.2 (in adult head), 113.9 (in child head), 128.2 (in chicken meat). The gain of antenna is −11.9 dBi (in adult head) and −15.6 dBi (in chicken meat) at 6.5&#xa0;GHz. In addition, the specific absorption rate (SAR) of the antenna is analyzed in both situations. The power link budget is numerically analyzed between the proposed antenna and the receiver dummy antenna. The link margin of 15dB is achieved within a distance of 50&#xa0;m.</p>