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By using optical single sideband modulation, we demonstrated instantaneous frequency measurement, which would be useful to monitor wideband radio signals with agile frequency change.
This paper presents the effect of the impedance curved surface to the characteristics of the RFID tag. The proposed passive RFID tag is placed on the elliptical curved surface. From the simulation result, it this found that the proposed RFID tag has a flat gain in the UHF RFID frequency band in Thailand. Moreover, the variation of the length and width of the elliptical surface is important effect...
Millimeter wave spectrum is the main candidate for body centric wireless applications such as health monitoring, live streaming, and gaming. In this paper, a frequency scanning microstrip antenna array is designed as it provides reconfigurability in the direction of main beam pattern. The designed antenna is an array of 16 elements with the measured impedance bandwidth from 33GHz to 40GHz. The S11...
This paper investigates the electromagnetic backscattering characteristics of moving vehicles when they are illuminated by the radiation of radar antennas. In particular, the vehicles are located close to the antennas as appeared in the anti-collision warning system at millimeter wave (mmW) frequencies. The backscattering fields are processed through the procedure of a realistic radar system to exhibit...
In this article, a bandwidth-enhanced metasurface has been designed using single circular split ring as unit cell on the top surface of a metal backed FR4 substrate. The structure behaves as cross polarization conversion (CPC) metasurface over full width at half maxima (FWHM) bandwidth of 12.94 GHz ranging from 9.44 GHz to 22.38 GHz. The proposed CPC metasurface maintains bandwidth enhancement upto...
This paper propose a method of suppressing inter-user interference in the in-band full duplex communication. In this method, an interference compress technique is used for eliminating the interference at the receiving terminal. Also, we evaluated the achievable transmission rate of the proposed method by using channel state information (CSI) measured by the outdoor field experiment.
A novel mm-wave phased array antenna for whole metal covered 5G mobile handset is proposed. The proposed array antenna consists of eight rotated slot antenna elements that are arranged on the upper frame of the metal-body. The proposed array demonstrates good S-parameter characteristics in frequency band ranging from 27.1 to 28.6 GHz and mutual-coupling between antenna elements is less than −19 dB...
A position estimation technique using electromagnetic wave has been proposed for object detection in wireless power transmission. However, conventional position estimation method has a problem that position estimation accuracy varies with object position. This paper proposes a position estimation method using hyperbola obtained from time difference and ellipse obtained from path length. Due to the...
Dealing with multiple antennas in various wireless devices has raised a distress of health effect. Thus, the investigation towards the relations between the electromagnetic field (EMF) radiation and human health is significant to be discovered. Hence, this paper presents the specific absorption rate (SAR) investigation on a single and 1 × 2 array of microstrip patch antenna operated at 0.8, 0.85,...
We investigated the millimeter-wave absorber integrated planar slot array antenna for a 120-GHz-band close proximity wireless system. Precise alignment and multiple reflection between Tx-Rx antennas become the problem for the application of >100-GHz-close-proximity wireless system. The millimeter-wave absorber integrated planar slot array antenna solves these problems. We adopted the split-ring...
We present passive UHF RFID electro-textile tags integrated into two types of gloves for wearable RFID applications. The performance of the electro-textile glove-tags is evaluated on a male test subject and the results are compared to glove-tags with copper tape antennas. Based on the achieved results, the read ranges of the electro-textile tags are very close to those of the copper tape tags and...
A simple circularly polarized (CP) antenna array is proposed for millimeter-wave applications. The proposed CP antenna array has a two-layer structure, which is easy for fabrication. A circular loop with a parasitic element is used as the radiation element for wideband operation. It is shown that the proposed 4×4 CP antenna array can achieve a gain of 13–16 dBi from 28.5 to 31.5 GHz.
To deal with randomness and uncertainty problems, an adaptive discontinuous Galerkin time domain (A-DGTD) method is proposed to quantify the influence of defect factors. In order to prove the efficiency of the method, the standard statistical analysis is performed to calculate the mean of reflection coefficients caused by random/uncertain physical parameters on a dielectric slab.
A novel method has been developed that uses an equivalent circuit model with lumped elements to design a miniaturized Frequency Selective Surface (FSS), which is based on the theory of meta-materials. Specifically, the equivalent circuit model is introduced to simplify the design of the miniaturized FSS without using numerical analyses such as the method of moments (MoM), finite-difference time-domain...
In order to improve the estimation accuracy of radio propagation simulation using a 3D model reconstructed by depth sensors, recovering missing regions of the 3D model is important. In this paper, we report an evaluation result of indoor radio estimation accuracy by using such a completed 3D model. We first describe the evaluation scene and the measurement method of radio powers we used for experiments...
Electrically small Huygens dipole antennas are reported that are low profile, broadside radiating, have high radiation efficiencies, and are either linear (LP) or circularly (CP) polarized. The Huygens behavior, i.e., a high front-to-back ratio with a cardioid-like pattern, is realized by exciting two (LP) or two pairs (CP) of complementary electric and magnetic dipole radiators, simultaneously having...
The hybrid analysis of mode matching/FEM (MM/FEM) is applied to a waveguide short-slot 2-plane coupler. The analysis model is reduced to the one-eighth model by considering the three-dimensional structural symmetry. The analysis results agree well with those by HFSS.
In this paper, a miniaturized wideband dual-polarized antenna loaded with parasitic loops and straight dipoles has been proposed for 2G/3G/4G base-station applications. Firstly, by loading four parasitic loops to the corners of regular crossed loop dipoles, a miniaturized structure and enhanced impedance bandwidth can be obtained. Then, based on the miniaturized structure, two straight dipoles are...
Four linearly-polarized (LP) metalines are adopted for realizing an LP beam-steering antenna, where one of the four feed points is activated (connected to a source) and the remaining three feed points are non-activated (open-circuited). Similarly, an antenna system composed of four circularly-polarized (CP) metalines is investigated to realize a CP beam-steering antenna. The LP and CP waves radiate...
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