Description
Conformal antennas are the antenna that conforms to a surface and whose shape is mainly determined by considering aero-dynamicity, compactness, and low profile dimensions along with their electromagnetic property. Conformal antennas are widely used as missile and aircraft antenna, where they can easily be placed on cylindrical or conical surfaces.Conformal antennas have also been developed for wrist, shoulder, chest, head wearable devices. Microstrip antennas have emerged as the most suitable option for developing a conformal antenna because of its inherent advantage of compactness, low profile, and ease of fabrication. But at the same time, microstrip antenna suffers from narrow bandwidth,low gain, and high conductor loss. Dielectric resonator antenna came up as a suitable alternative to microstrip antenna as it exhibits higher gain, better bandwidth, and low loss.But achieving all antenna objectives maintaining dielectric resonator antenna conformal to some specific surface is challenging for the antenna designer. In this research work,conformal microstrip as well as dielectric resonator antennas have been developed for wearable applications or cellular communications. At first, conformal microstrip antenna on lightweight semi flexible substrate has been developed to support Global Positioning System, GPS (1.575 GHz) and Industrial, Science and Medical, ISM (2.45 GHz) bands in body worn applications. Antennas for body worn applications need to be tested under bending conditions as well as in the presence of a human body. Therefore, experiments have been conducted under three different cases, namely, ‘flat wearable’, ‘cylindrical wearable’ and ‘wrist wearable’. Wearable antennas with circular polarisation can ensure reliable communication despite human body movement. Hence in the next research work, circular polarization has been incorporated in a rigid pocket sized microstrip antenna along with wide impedance bandwidth. Because of wide impedance bandwidth and axial ratio bandwidth, this structure can support a wide range of applications. Antenna radiation has the potential to be harmful to the human body. So, radio frequency exposure testing is required for antennas used in wearable applications. For this purpose, specific absorption rate has been measured for the presented antenna structure.
Details
Publisher - CLASSICBOOKS
Author(s) - SAUMYA DAS
Paperback
Published Date - August 07 2023
ISBN - 9603438000171
Dimensions - 27.9 x 21.6 x 1 cm
Page Count - 170
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