Abstract
This paper presents a study into radiation pattern measurements of an electrically small dielectric resonator antenna (DRA) operating between 2.4 and 2.5 GHz in the industrial, scientific and medical (ISM) radio band for body-centric wireless communication applications. To eliminate the distortion of the radiation pattern associated with the unwanted radiation from a metallic coaxial cable feeding the antenna we have replaced it with a fibre optic feed and an electro-optical (EO) transducer. The optical signal is then converted back to RF using an Opto-Electric Field Sensor (OEFS) system. To ensure traceable measurements of the radiation pattern performance of the wearable antenna a generic head and torso solid anthropomorphic phantom model has been employed. Furthermore, to illustrate the benefits of the method, numerical simulations of the co-polar and cross-polar H-plane radiation patterns at 2.4, 2.45, and 2.5 GHz are compared with the measured results obtained using: (i) an optical fibre; and (ii) a metallic coaxial cable.
Highlights
The rapid growth of the wireless communications market has resulted in new applications constantly being developed
This paper presents a study into measurement of the radiation pattern of a body-wearable electrically small dielectric resonator antenna (DRA) using a non-invasive Opto-Electric Field Sensor (OEFS) optical fibre link system
The measured results using the optical fibre link were validated with numerical simulation and measurements using a metallic coaxial cable
Summary
The rapid growth of the wireless communications market has resulted in new applications constantly being developed. When testing a prototype wearable antenna, it is normal to connect it to a metallic coaxial feed cable, even though such a cable may not be present in the final application of the antenna This makes it difficult to assess the radiation performance of such antennas especially ones without a balun or adequate balancing match, as they are prone to unwanted common mode currents on the metallic coaxial cable used to feed the antenna during the measurement [25]. This paper presents a study into measurement of the radiation pattern of a body-wearable electrically small dielectric resonator antenna (DRA) using a non-invasive Opto-Electric Field Sensor (OEFS) optical fibre link system. Radiation performance using an optical fibre link, an anechoic chamber and a solid anthropomorphic phantom, whose electromagnetic properties sufficiently match those of human tissue and organs over the frequency range of interest.
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