Miniaturized Circularly Polarized Loop Antenna for Biomedical Applications

A novel circularly polarized antenna is proposed at 2.42-2.48 GHz Industrial, Scientific, and Medical band for implantable applications. By properly positioning the feed and shorts, either right-hand circular polarization property or lefthand circular polarization property can be realized. Slow wave concept is utilized by loading patches to the radiated loop antenna to achieve miniaturization. Thus, a compact size of 13 mm 13 mm 1.27 mm is obtained. Compared to the unloaded loop antenna of the same size, the centre frequency shifts from 1.93 GHz to 882.5 MHz, which suggests a miniaturization of 54.4%. The simulated results show that a wide bandwidth of 18.2% can be realized with |S11| below -10dB and axial ratio below 3 dB. The simulated realized gain is -32 dBi at 2.45 GHz. The measurement is carried out in both skin-mimicking gel and pork, and a bandwidth of 27.8% and 29.4% can be achieved with |S11| below dB, respectively. The measurement of |S21|reveals that circular polarization can be obtained for the proposed configuration.

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