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In this letter, 3D printing technology is used to modify the substrate shape with the aim of modifying the antenna's performance. The antenna substrate is made using a 3D printer and commercially available materials. A ridge near the center of the patch has been used to downshift the resonant frequency of the antenna. The effect of the ridge shape has been investigated via simulations and measurements...
MIMO antenna concepts for electronic eyewear devices operating in 4G cellular standard are proposed in this paper. Coupling element type antennas and matching circuits are used to obtain a high bandwidth potential for the coverage of the 700–960MHz and 1.7–2.7GHz frequency bands. To obtain a dual-antenna MIMO configuration, two CE type antennas are placed on the two sides of the head, resulting in...
A heterogeneous substrate is designed when the permittivity of a substrate is changed as a function of location. Due to non-uniformity of the electric fields in a patch, loading of different areas with heterogeneous dielectrics can change behavior. In this paper heterogeneous substrates are employed to increase the bandwidth of a patch by combining its first and second resonance.
This paper considers the design of microwave patch antennas using bespoke substrates. The permittivity of the substrate is controlled by inserting small scale metallic inclusions into a host medium and can be obtained using an S-parameter inversion algorithm on the results of plane-wave simulations. Electromagnetic simulations have been used to compare the performance of the patch on the heterogeneous...
This paper investigates the concept of creating substrates with heterogeneous dielectric properties. By suitably locating areas of low and high permittivity, the second resonance can be moved closer to the 1st resonance and multiband antennas can be created. By combining, the resonances, the bandwidth of the antenna can be increased.
This study investigates the Over the Air (OTA) power measurements from a mobile phone when held by the CTIA hand phantom compared to a number of participant's hands. A measurement setup in a shielded environment was setup to ensure that all the participants held the mobile phone in a similar fashion to the hand phantom so that accurate comparisons could be made. Measured results show that the received...
An analytical study of heterogeneous substrates created by including small particles arranged in a cubic lattice within a host medium is presented in this paper. Rapid advances in nanomaterial fabrication techniques will allow in the near future, heterogeneous samples to be created with nano or micro-sized inclusions, and this paper investigates the electromagnetic (EM) properties of these structures...
An analytical study of artificial materials created by embedding spherical nano-particles in an infinite homogenous medium is presented in this paper. Propositions by various contributors to this area of the nanomaterials' field have been compared with respect to their approaches in finding the effective constituent parameters, over wide frequency ranges. Their closed form equations were examined...
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