A compact circularly polarized (CP) implantable antenna working at 915 MHz, at the industrial, scientific, and medical (ISM) band is developed in this paper. The proposed radiator is based on a fully planar and low profile patch antenna with a ground plane and different slots but without any via holes what makes the structure a good candidate for implantable devices. The circular polarization is achieved by means of introducing a surrounding and asymmetrical U-shaped structure. A meander line has been included in the inside of the U-shaped structure to increase the electrical length of the antenna without increasing its mechanical dimensions. An impedance bandwidth of 18.9 % from 810 to 980 MHz and an axial ratio of 17.2 % from 850 to 1010 MHz has been achieved. The proposed antenna has a compact size of 5.2 × 5.6 × 0.25 mm3 which seems to be the smallest antenna over the recently reported implantable antennas. In addition, the proposed antenna achieves a relatively high gain value of -23 dBi.
A compact circularly polarized (CP) implantable antenna working at 915 MHz, at the industrial, scientific, and medical (ISM) band is developed in this paper. The proposed radiator is based on a fully planar and low profile patch antenna with a ground plane and different slots but without any via holes what makes the structure a good candidate for implantable devices. The circular polarization is achieved by means of introducing a surrounding and asymmetrical U-shaped structure. A meander line has been included in the inside of the U-shaped structure to increase the electrical length of the antenna without increasing its mechanical dimensions. An impedance bandwidth of 18.9 % from 810 to 980 MHz and an axial ratio of 17.2 % from 850 to 1010 MHz has been achieved. The proposed antenna has a compact size of 5.2 × 5.6 × 0.25 mm3 which seems to be the smallest antenna over the recently reported implantable antennas. In addition, the proposed antenna achieves a relatively high gain value of -23 dBi. Read More
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