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This paper presents a novel concept data collecting device for body-centric wireless communications, smart robe or blanket. It couples to sensor units on human body wirelessly by just putting on the human body. It is consisting of textile-based free access mat. The free access mat is a thin sheet-shaped waveguide which wireless devices can couple to at an arbitrary position on it. We investigate the...
In this paper, we describe an RF energy-harvesting circuit printed on a single FR4 substrate to ensure compact and low profile design at 2.1 GHz. The circuit integrates a notched Circular Microstrip Patch Antenna (CMPA) with a fully matched single diode rectifier to form an efficient rectifying antenna. By cutting two electrically small triangular notches, at 45° and 315° of the patch, it is possible...
This paper proposes a dual-band rectifier circuit that uses Schottky diodes to convert DTV signals (470 - 770 MHz) and tag reader signals (950 - 956 MHz) to DC voltages for passive tag activation and enhanced range operation. Converted DC voltage in the presence or absence of tag reader is investigated in Agilent's ADS simulator under multi-tone or single tone excitation, respectively. Generally,...
Large channel capacity is achieved by Multi-Input Multi-Output (MIMO) technology with multi-antenna at the transmitter and receiver side, and many studies to maximize the channel capacity have been performed [1], [2]. In indoor wireless communications for small area as typified by femtocell and wireless LAN, the channel capacity has been reported to be enhanced by directional antennas and multi-polarization...
In multiple-input multiple-output (MIMO) systems, orthogonal polarization is utilized to achieve small mutual coupling and low spatial correlation. We present the 4 times 4 MIMO channel measurements in the line-of-sight (LOS) environment in a small room. We reveal the difference of the channel capacity dependent on receiving positions by comparison of the vertical polarized antenna configuration (V)...
This paper presents an electrically small and low profile plate loop antenna with dual inverted-F resonant modes for mobile satellite communication systems in the VHF band. The proposed antenna consists of a feed element and a parasitic element for dual mode operation. A square patch element attached to an inner loop provides the function to adjust the frequency of higher resonant mode. Its dominant...
A lightweight phantom is made by a plastic shell with a shape of the human head and it has a cavity inside. The cavity is filled entirely or partially with the absorbers. In the next section, we evaluate the characteristics of the phantom with a dipole antenna near a COST244 spherical model imitating the human head. The radiation patterns are measured in experiment, and the phantom is compared with...
Metamaterials are artificially constructed to have special electromagnetic properties not found in nature. In recent years, metamaterial is noted as a new kind of device, and the composite right/left-handed transmission lines have been proposed, which are characterized by antiparallel phase and group velocities and negative refractive index. The materials were termed as left-handed materials due to...
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