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This paper presents a preliminary investigation on the body proximity cross-polarization properties considering the human walking motions for BAN on-body wireless communication systems. A novel concept of the BP-XPR (Body Proximity Cross-Polarization Power Ratio) in on-body channel is defined, which has been quantified based on relative antenna locations and radiation gain of test antennas. The analytical...
This paper presents a three-axis decoupling stubloaded parallel dipole array antenna with tri-orthogonal polarization directivity. The decoupling characteristics are realized using the phase shifter composed of a quarter-wavelength stub placed at two sides of three parallel dipole array antenna for creating the opposite phase of the current distribution. Further, the quarter-wavelength stub is operated...
This paper presents a disk-loaded monopole stacked with patch antenna (DLMP) with a low-profile structure. The DLMP has three driven ports, each of which can create independent radiation patterns with orthogonally polarized characteristics. A design example is presented to achieve an overall height of 10 mm at 2 GHz. The calculated results show that the DLMP has well-defined monopole mode and patch...
This paper presents a polarization-controlled MIMO antenna to realize ultra high-speed and high-capacity mobile communications. The proposed antenna is comprised of three orthogonal dipoles, which can be controlled using a weight function created based on the variation of cross polarization power ratio (XPR) and the antenna inclination angle. By adjusting a phase shift between the antenna elements...
This paper investigates the mutual interactions between MIMO antenna radiation and multipath characteristics to obtain useful knowledge that can be employed in the design of a three-dimensional OTA system. In investigating factors that may affect the MIMO channel capacity, we focus on two key parameters, the incident wave power distribution in the elevation direction and the radiation pattern of terminal...
This paper presents a new methodology of an Over-the-Air (OTA) testing using an arm-swinging dynamic phantom applied to wireless Body Area Network (BAN) systems. The phantom has unique features, in that swinging of the right and left arms and the direction and speed of swing can be controlled independently, leading to excellent capability for replicating the variety of natural walking and running...
This paper presents a new methodology for BAN-OTA testing using a fading emulator with a dynamic phantom. The key to the success of the proposed apparatus is to provide the fading emulator with a proper K-factor that can represent an actual propagation environment under consideration. Hence, experiments for getting the knowledge of K-factor in indoor environments have been carried out. It is revealed...
This paper presents a new methodology for BAN-OTA Testing using a developed fading emulator with a dynamic phantom. The key to the success of the proposed apparatus is to provide the fading emulator with a proper K-factor that can represent an actual propagation environment under consideration. Firstly, a configuration of the developed fading emulator used for BAN-OTA Testing is shown. Based on the...
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