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Article type: Cover
Pages
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Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Article type: Index
Pages
Toc1-
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Takafumi FUJIMOTO, Hiroshi YOKOYAMA
Article type: Article
Session ID: BCT2014-1
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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A stacked square microstrip antenna (MSA) with a shorting pin combined with a stacked ring MSA is proposed for quadruple band operation. The two antennas are excited by an L-probe feed. Antenna characteristics (VSWR and radiation pattern) and operational principle are clarified by simulation. Moreover, the antenna is designed for Wi-Fi (2.4/5.2/5.6GHz bands) and 4G mobile communication systems (3.5GHz band)
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Kozo Jono, Takafumi Fujimoto
Article type: Article
Session ID: BCT2014-2
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Authors have proposed a printed rectangular monopole antenna for circularly polarization. The simulated bandwidth of 3dB-axial ratio with 10dB-return loss is approximately 84%. RHCP gain is greater than -3dBic at the frequency band with axial ratio≦3dB. In this study, operational principle for wideband circularly polarized wave is clarified by electric current distribution.
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Mitsuo TAGUCHI, Akihiko MORI
Article type: Article
Session ID: BCT2014-3
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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The inverted L antenna composed of the coplanar waveguide located on the same plane of rectangular conducting plane is proposed and analyzed numerically. When the size of conducting plane is 250 mm by 60 mm and the distance between the antenna element and the conducting plane is 25 mm, the return loss larger than 10dB is satisfied at the broadcasting frequencies from 485MHz to 625MHz. The voltage reflection coefficient, the current distribution, and the directivity are investigated as the function of the distance between the antenna element and the ground plane. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moments is used.
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Mitsuo TAGUCHI, Sho TAKEI
Article type: Article
Session ID: BCT2014-4
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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The reception rectifying circuit of the wireless power transmission system composed of the unbalanced fed ultra low profile inverted L antenna on a rectangular conducting plane is studied. The half-wave double voltage rectifying circuit with two schottky diodes is proposed and analyzed numerically. The design frequency is 2.45GHz. The size of rectifying circuit is 32.8mm by 24mm. The input impedances of receiving antenna and rectifying circuit are matched to 50 ohms by adjusting the position and length of short stub. The return loss bandwidth larger than 10dB is 150MHz. In the case of lossless transmission line, the output DC voltage becomes 5.33V for input AC voltage of 3V.
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Ryuichi TESHIMA, Takayuki TANAKA, Ichihiko TOYODA
Article type: Article
Session ID: BCT2014-5
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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The CRLH (Composite Right/Left Handed) metamaterial is an attractive technology to achieve miniature and high performance RF circuits in wireless equipment. Many RF functional circuits have been developed using CRLH microstrip transmission lines. On the other hand, we are focusing on the both-sided microwave circuit technology for next generation RF circuits. In this paper, a CRLH slot line is proposed to integrate CRLH metamaterial technology into both-sided microwave circuits, and its basic characteristics are demonstrated.
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Atsushi MAEDA, Takayuki TANAKA, Ichihiko TOYODA
Article type: Article
Session ID: BCT2014-6
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Recently, CRLH transmission lines have been much attracted in microwave community. We have proposed a new design concept for microwave circuits utilizing the band-gap characteristic of the unbalanced CRLH transmission lines. As an example, a novel branch-line hybrid having a band-rejection function was examined to show the feasibility of this concept. However, this branch-line hybrid can't change the rejection bands. In this paper, concept and design of a new CRLH transmission line with variable band gap are proposed to solve the issue.
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Naoto Hadano, Kazunori Uchida, Keisuke Shigetomi, Masahumi Takematsu
Article type: Article
Pages
25-28
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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In this paper, we use the 1-ray model to estimate electromagnetic field distration and distribution of the communication distance in complicated propagation environments. In the real environment, it is hard to calculate them accurately because of various kinds of attenuation occurred by reflection or diffraction. We have arranged the 1-ray model in order to deal with propagation problems by introducing the amplitude modification factor α and the propagation order of distance β. The two parameters α and β can be determined by comparing the proposed model with the Okumura-Hata model. Applying building coverage ratio to the 1-ray models, we propose a new method to estimate electromagnetic field distributions in various kinds of environments, in addition to the three areas defined by the Okumura-Hata model. We show some numerical examples of estimated distributions of α and communication distance in Fukuoka city.
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Ryosuke IWAI, Mayumi MATSUNAGA, Toshiaki MATSUNAGA
Article type: Article
Session ID: BCT2014-8
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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In this paper, the results obtained by the statistical studies to clarify the mechanism how round convexities influence Electromagnetic wave propagating around them have been shown. That putting round convexities on the surface of the concrete walls makes reflection waves bigger sometimes has been shown by the authors with numerical analyses and experimental measurements. When the wave length of transmitted waves is about the size of convexities, standing waves obtained by the perpendicularly located concrete walls having round convexities are quite different from those obtained by the flat walls. For this reason, the standing waves made by the concrete walls with various radius of curvature and periodic spaces of round convexities have been simulated by the FDTD method. In conclusion, it has been shown that the amplitude of the reflection wave is changed depending on the distance from the wall.
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Shingo Otsuka, Norimasa Nakashima, Masahiko Sumida, Kazuki Numari
Article type: Article
Session ID: BCT2014-9
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Energy harvesting is the process that collects small amounts of energies in the background and converts them into electric power. Recently, power consumption of digital device has decreased. For this reason, energy harvesting is noticed. The Fukuoka Institute of Technology is located near two AM radio broadcasting stations. We speculate that a considerable electric power is obtained by the electromagnetic waves radiated from the two stations. In this paper, we make rectifying antenna that coverts the electromagnetic waves into DC electric power. This rectifying antenna is located at the place approximately 50 meters away from one of the AM radio broadcasting stations and is checked the performance of the energy provision. As a consequence, this rectifying antenna provides the maximum power of 2.39[mW] at the place. Regarding this rectifying antenna as a DC voltage source, an internal resistance and an electromotive force are 510[kΩ] and 71.4[V],respectively.
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Takuma Hashimoto, Kazunori Uchida, Masafumi Takematsu
Article type: Article
Session ID: BCT2014-10
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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This paper is concerned with the propagation characteristics of electromagnetic (EM) waves propagating along inhomogeneous random rough surfaces (RRSs). Applying a least squares method (LSM) to the 1-ray model, we can estimate modification factor α and propagation order of distance β characterizing the 1-ray model in comparison with the numerical results computed by discrete ray tracing method (DRTM), and thus we can analyze the propagation characteristics along inhomogeneous RRSs. Finally, we show some numerical examples and discuss the efficacy of our proposed method.
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Motohiko IWAIDA, Jiro IWASHIGE, Saki KAMEYAMA
Article type: Article
Session ID: BCT2014-11
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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It is important to estimate the wave propagation paths in the urban areas from the viewpoint of effective utilization of radio resources. In urban areas, walls and edges of buildings and other structures affect radio propagation. In this paper, we consider electromagnetic waves diffracted by two edges with arbitrary angles.
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Noriyuki KAGIYAMA, Yusuke SAITA, Tsutomu ITO, Hisashi MORISHITA
Article type: Article
Session ID: BCT2014-12
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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We have studied the helmet antenna for disaster prevention in order to propose the structure that a transceiver, antenna and microphone are mounted on the helmet which has already been served as disaster prevention. Since the helmet antenna needs to have the characteristics of miniaturization and multiband, we have considered the combined folded dipole antenna with one port. First, we analyze the characteristics of the plane and hemispherical antenna model. Next, we analyze the restraint of radiation to the head direction using the human head model.
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Tsutomu ITO, Shingo TANAKA, Hisashi MORISHITA
Article type: Article
Session ID: BCT2014-13
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Folded dipole antenna with feed line has been already reported as a wideband antenna. This antenna can be used for a small terminal and is composed on the same plane as the ground. Relative bandwidth (VSWR≤3) is about 65%, but the antenna itself is prominent from the ground plane by 12 mm. In this report, we propose two different configurations of the antenna in 3D so that the antenna does not protrude from the ground plane as much as possible. The relative bandwidth, radiation pattern and gain are investigated. As a result, it is confirmed that that antenna prominence can be reduced and wider bandwidth over 78% and 93% are obtained by the measurement of the prototypes. Also, basic performance of the new models shows better omnidirectional characteristic and reasonable gain compared with the conventional model.
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Mitsuo TAGUCHI, Ryodo YOSHIZAWA
Article type: Article
Session ID: BCT2014-14
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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The Vivaldi antenna on the dielectric substrate with the size of 100 mm by 60 mm is numerically analyzed. Its input impedance, radiation characteristics, and the near field distribution are studied. The design frequencies are from 3 GHz to 6 GHz. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moments is used.
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Mitsuo TAGUCHI, Kazunari IMAYOSHI
Article type: Article
Session ID: BCT2014-15
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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The slot antenna on a rectangular conducting plate is numerically analyzed. The slot antenna is excited by the sine-wave voltage generator with the frequency of 500 MHz at its center. The current distribution on the conducting plate and the electromagnetic field distribution on the slot are studied for three slots antenna with different width. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moments is used.
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Hiroyuki MAEMA, Takeshi FUKUSAKO
Article type: Article
Session ID: BCT2014-16
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Radiation efficiency of an electrically small and low profile antenna is improved by stacked elements. The meander line elements are stacked closely with an interval of 25 μm. The elements are close to the back conductor with a closest distance of 2 mm and satisfied the ka=0.476. This electrically small and low profile antenna has achieved a radiation efficiency of 79% in both simulated and measured results.
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Kittima LERTSAKWIMARN, Chuwong PHONGCHAROENPANICH, Takeshi FUKUSAKO
Article type: Article
Session ID: BCT2014-17
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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This paper presents an electrically small and circularly polarized antenna with omnidirectional radiation pattern. This antenna consists of a horizontal loop element with double U-shaped parasitic structures and a vertical element from a feeding point to generate circular polarization. An omnidirectional radiation pattern of circular polarization is obtained in 360-degree azimuth directions with the maximum gain of -1.9 dBic in the parallel direction to the ground plane at 900 MHz band. The overall size of the proposed antenna including the ground plane is 48 mm × 20 mm × 12.8 mm (0.14λ × 0.06λ × 0.04λ) with ka = 0.46 < 0.5 (k: wavenumber at the resonant frequency, a: radius of a sphere surrounding the antenna), corresponding to a definition of electrically small antenna. The measured results show that the fabricated circularly polarized antenna has the omnidirectional radiation pattern. The simulated and measured results are also demonstrated and discussed.
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Yukihiko UEHARA, Eisuke NISHIYAMA, Ichihiko TOYODA
Article type: Article
Session ID: BCT2014-18
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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In this paper, a wide-angle rectenna employing microstrip array antenna and Magic-Ts using both-sided MIC technology is proposed. The Magic-T converts two received signals to their in-phase and anti-phase components. Then each component is rectified to DC power, respectively. The feasibility and basic characteristics of the proposed wide-angle rectenna is experimentally examined. Much wider reception angle than those of conventional array antennas was obtained.
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Yuta YOSHITAKE, Takafumi FUJIMOTO
Article type: Article
Session ID: BCT2014-19
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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A dual band circularly polarized square microstrip antenna with one pair of L-shaped slit at each edge is proposed. The antenna is fed by an L-probe coaxial feed. The bandwidths of 3dB-axial ratio wit -10dB-|S11| are greater than 10MHz at both L1 band and L2 band in GPS. By simulations, the relationships between gain and parameters of antenna geometry are investigated. Moreover, to ascertain the accuracy of the simulated results, the simulated axial ratio and return loss are compared to experimental data.
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Haruyasu ONODA
Article type: Article
Session ID: BCT2014-20
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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In 2003, terrestrial digital HDTV broadcasting service started. Most of the TV programs were produced in HDTV. However, at that time there were some difficulties for broadcasting live road races in HDTV, as there wasn't enough capacity to send the transmission in those days. We solved the problem of live broadcasting for road races by using a new transmission system. It uses ARIB STD-B33 digital 800MHz FPU and H. 264 CODEC. In addition to those technologies, we also use some other techniques to produce road race programs more simply and stably. We will introduce our method in this report. According to the new frequency allocation plan, broadcasters are required to adjust their transmission frequencies for FPU equipment from 800MHz to 1.2/2.3GHz. We also continue to develop transmission techniques to adapt to the new frequencies.
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Takafumi FUJIMOTO, Rikiya Taniyama
Article type: Article
Session ID: BCT2014-21
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Authors have proposed a printed rectangular monopole antenna for circular polarization. The radiation characteristics of the wideband circular polarization are achieved by designing the antenna asymmetrically. The simulated bandwidths (3dB-axial ratio with 10dB-return loss) are approximately 64%. In this paper, miniaturization of the antenna proposed by authors is examined. The size of the antenna miniaturized in this paper is approximately 40% of the antenna proposed in the authors' previous study. The bandwidth is approximately 40%.
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Mitsuo TAGUCHI, Hirotaka OBA
Article type: Article
Session ID: BCT2014-22
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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The circular polarized antenna composed of an unbalanced fed ultra low profile inverted L antenna and L shaped slot is proposed for the reader antenna of the portable terminal of RFID. At UHF band from 915 MHz to 930 MHz, the condition make the circular polarization is the S_<11> less than -10dB and axial ratio less than -3dB. The analysis model met this condition. In the numerical analysis, the electromagnetic simulator "WIPL-D" based on method of moment is used.
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Kazuya KINOSHITA, Ryohei WATANABE, Masaharu SATO, Hirofumi ICHIKI, Tsu ...
Article type: Article
Session ID: BCT2014-23
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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This paper presents a characteristics of microstrip antenna located near radioactive source. Electric devices in high does area, such as outer space and nuclear power plant, may be damaged or unserviceable. It may be possible that gamma-ray makes change the function of electric devices or electrical properties of the substrate in the devices. Therefore it is important to make clear the influence of gamma-rays irradiation to electric properties of the material. This paper will show the characteristics of microstrip antenna under the low-level gamma rays irradiation, and it becomes the fundamental data to clarify the influence of radiative source to the material.
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Yoshitake HAMA, Tsuyoshi MATSUOKA, Masato OGATA
Article type: Article
Session ID: BCT2014-24
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Authors launched a 1 seg TV station at Kyushu Sangyo University in September 2012, which is designed to be used for on-campus broadcasting. The service area is limited to the small area not to affect other wireless services. Therefore it is very important to make clear the service area for effective use of the service. The service area is closely correlated to the electric field at the point. In this paper, the electric field strength on the broadcasting service is measured on campus. And the receiving characteristics on the same point are evaluated by using the several one segment broadcasting receiver. From the results, we illustrate the area map that indicate the receivable area on campus.
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Yuuta KATAHIRA, Yuusuke MIZOGUCHI, Masato OGATA, Tsuyoshi MATSUOKA
Article type: Article
Session ID: BCT2014-25
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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We have operated KSU area one-seg broadcasting service taking advantage of TV white space since September 2012. The KSU area one-seg broadcasting service aims to contribute to the community by providing many useful pieces of information and news about our university and the neighboring area. Broadcasting outdoor events live is an effective means to attain our objective. In this paper we make live broadcasting system using an RTSP server and a WLAN connection and carry out a demonstration experiment at our campus festival.
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Kazunori UCHIDA, Masafumi TAKEMATSU, Junichi HONDA
Article type: Article
Session ID: BCT2014-26
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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This technical report is concerned with a criterion for discretizing random rough surfaces (RRS) generated by the convolution method when we analyze the propagation characteristics along RRS by using discrete ray tracing method (DRTM). Based on numerical discussions, a discretization criterion for RRS generation is proposed in a simple form to guarantee RRS convergence and another criterion for DRTM is also proposed to keep the accuracy of numerical field intensities. Some numerical results are shown to demonstrate the effectiveness of the proposed criteria.
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Hiroki OHTA
Article type: Article
Session ID: BCT2014-27
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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In the analysis using digital terrestrial television broadcasting (DTTB) of a propagation characteristic, when observing minute change of frequency or a phase, influence of the phase noise included in the frequency reference of a transmitting system and a system of measurement in addition to thermal noise, etc. cannot be disregarded. In addition, the phase characteristic of the receiving cable by a temperature change also influences. In this study, we investigate methods for suppressing the phase noise affecting the measurement of the propagation characteristics in the propagation path. And we propose a method to measure precisely by suppressing the noise by using the DTTB signal passing through the CATV line.
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Madoka NAKAMURA, Hiroaki MIYASAKA, Yoshikazu NARIKIYO, Masayuki TAKADA
Article type: Article
Session ID: BCT2014-28
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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NHK is conducting research on the next generation of digital terrestrial broadcasting to enable large-volume content services such as Super Hi-Vision and studying on the large capacity transmission technologies using dual polarized MIMO and ultra multi-level OFDM. And, expansion of FFT size and reduction of GI ratio were conducted in order to expand transmission capacity. When some services for fixed receivers and for mobile terminals are transmitted by frequency-division multiplexing in the large FFT size systems, the BER characteristics would be suffered from the Inter-Carrier Interference (ICI). In this report, the mobile reception performances applied channel estimation based basis expansion model and ICI compensation by belief propagation are reported with the computer simulation.
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Yoshikazu NARIKIYO, Hiroaki MIYASAKA, Madoka NAKAMURA, Hitoshi SANEI, ...
Article type: Article
Session ID: BCT2014-29
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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We are developing a next-generation terrestrial broadcasting transmission system for handheld and mobile reception which uses two transmission antennas and two receiving antennas (Multiple-Input Multiple-Output: MIMO) and be able to transmit large capacity contents stably. In the case of MIMO system, channel impulse responses from each transmission antenna to each reception antenna must be estimated. We have studied the estimation method by Walsh coded scattered pilot. This paper describes the computer simulation results of the SFBC-MIMO and the SDM-MIMO transmission system under mobile reception environments. As the result, the SDM-MIMO system reception performance is better than SFBC-MIMO system when the transmission rate is 4bits/Hz or more.
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Takuya SHITOMI, Shingo ASAKURA, Susumu SAITO, Tomohiro SAITO, Kazuhiko ...
Article type: Article
Session ID: BCT2014-30
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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NHK is conducting research on the next-generation of digital terrestrial broadcasting using UHF band to enable large-volume content services such as 8K Super Hi-Vision. As a technology to expand transmission capacity, we have studied dual-polarized MIMO which uses two orthogonal polarizations simultaneously and ultra multi-level OFDM in which the carrier modulation is expanded up to 4096 QAM. We evaluated the transmission characteristics of Non-uniform mapping which optimizes the distance between the symbols in QAM constellation. We confirmed the advantages of Non-uniform mapping compared with the conventional uniform mapping in dual-polarized MIMO, ultra multi-level OFDM transmission.
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Syouhaku Gyuu, Takeshi Higashino, Minoru Okada, Ziji Ma
Article type: Article
Session ID: BCT2014-31
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Orthogonal Frequency Division Multiplexing (OFDM) is a type of multi-carrier scheme, which has been widely used in wideband digital communication systems. Recently, a novel technique called Compressive Sensing (CS) has been proposed to estimate the Channel State Information (CSI) for OFDM system, which provides an improvement of channel estimation performance even in the doubly-selective fading channel. However, the high computational complexity of CS restricts its implementation of practical applications. In this paper, a new method using 2-Step CS-based (2-SCS) channel estimation is proposed, which can effectively reduce the computational complexity. The Numerical results demonstrate that the proposed method gives accurate channel estimation performance for OFDM system.
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Fumiyasu Suginoshita, Satoshi Okabe, Jun Tsumochi
Article type: Article
Session ID: BCT2014-32
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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We are developing next generation FPU that is 120-GHz-band wireless transmission system for the uncompressed dual-green SHV signal (24 Gbit/s). This paper first analyzes BER estimation for the 120-GHz-band FPU, and then describes the results of transmission trials over a distance of 250 m up to 1250 m in clear-sky conditions.
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Article type: Appendix
Pages
App1-
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Article type: Appendix
Pages
App2-
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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Article type: Appendix
Pages
App3-
Published: January 22, 2014
Released on J-STAGE: September 22, 2017
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