The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This letter presents an experimental methodology for bit-error-rate over-the-air testing to evaluate the communication quality of body area network (BAN) antennas. We proposed a dual-discrete control method to detect an instantaneous bit error rate (BER) using a fading emulator with a dynamic human phantom. Particular emphasis is placed on how to implement the proposed method while simultaneously...
This paper presents a measurement method on the Bit-Error-Rate (BER) Over-The-Air (OTA) Testing of FSK signals for BAN antennas. The human body shadowing effects when a human walks in a multiple radio wave propagation environment are performed by a developed fading emulator with a dynamic phantom. The results show that the shadowing effect caused by the arm in a Rayleigh fading propagation environment...
This paper presents a preliminary investigation on the body proximity cross-polarization properties considering human walking motion for the applications to BAN (Body Area Network) On-Body wireless communication systems. Firstly, 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 on-body antenna locations...
This paper presents a design method for the Disk-Loaded Monopole stacked with Patch antenna (DLMP) using the print circuit board (PCB). The DLMP has three driven ports, each of which can create independent radiation patterns with orthogonally polarized characteristics. In this antenna, a disk-loaded monopole antenna for Z axis is stacked on a patch antenna for X axis and Y axis radiation. And both...
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 presents a dual-polarized turn-style patch antenna for BAN on-body communication systems. Our target is aiming at achieving an orthogonally-polarized omnidirectional radiation pattern in the mounting plane of the antenna, which is similar to the turn-style operating principle. The analytical results of a design example show that the desired radiation characteristics can be realized using...
This paper presents a bilateral fading emulator for MIMO-OTA testing with a function of controlling the correlation of base station. On the basis of the Jakes theory, a methodology for achieving the spatial correlation of a base station antenna by setting the initial phases of scatterers in the two-dimensional channel model is introduced. The experimental results show that the designed correlation...
This paper presents a polarization-controlled active antenna applied to BAN on-body communications. A primal objective is to achieve the enhancement of signal power, not only in downlink but also in uplink dynamic channels, between an access point mounted on the wrist and a sensor module attached to various locations on a human body. The proposed antenna is comprised of two orthogonal antennas, which...
This paper presents a polarization-controlled active antenna applied to BAN on-body communications. A primal objective is to achieve the enhancement of signal power, not only in downlink but also in uplink dynamic channels, between an access point mounted on the wrist and a sensor module attached to various locations on a human body. Firstly, a dynamic channel model to represent the geometrical relationship...
This paper presents a 3-axis weighted-polarization active antenna in order to realize ultra high-speed and high-capacity mobile communications. The proposed antenna is comprised of three orthogonal antennas, two of which can be selected according to a weight function in different situations. The weight function is created based on the variation of cross polarization power ratio (XPR) and the inclination...
This paper presents an automatic impedance-matching algorithm that can sequentially realize a simultaneous conjugate-matching state for all the elements in an N-element array antenna. The analytical results show that the converged solution obtained from the proposed algorithm agrees well with the solution calculated by the analytical deterministic equation, confirming the validity of the proposed...
This paper presents a new methodology of the OTA assessment for 2-dimensional arrangement MIMO array antennas. We have studied the minimum number of scatterers required for conducting a 3-dimensional OTA in a practical apparatus. Particular emphasis is placed on how well handset MIMO antennas with a 2D-structure are characterized using the limited number of scatterers implemented in a fading emulator...
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...
The regression based channel capacity (REC) has been proposed for a simple and efficient evaluation of compact MIMO antennas. By entering the mean effective gains (MEG), correlation of MIMO array elements, and incident wave SNR to the developed regression formula, one can readily estimate the 2 × 2 MIMO channel capacity without a large amount of computer and human resources. The validity of the REC...
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 analytical results on the BER degradation of QPSK signals for BAN antennas for the case where the combined outcome of shadowing and multipath fading emerge simultaneously and different types of human walking models are employed in the analysis. The results show that a probability of a low signal level is higher than that for the Rayleigh distribution owing to shadowing caused by...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.