All issues
Predecessor
40.01 Broadcasting and Communication Technologies(BCT)
Displaying 1-21 of 21 articles from this issue
- |<
- <
- 1
- >
- >|
-
Article type: Cover
Pages Cover1-
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (10K) -
Article type: Index
Pages Toc1-
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (53K) -
Mitsuo TAGUCHI, Tomoi MATSUOArticle type: Article
Session ID: BCT2016-1
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe narrow-band and wideband models of unbalanced feeding ultra low profile inverted L antenna is excited by the Gaussian mono-cycle pulse voltage source. The time response of voltage and current distribution at feed point are investigated and their frequency spectra are discussed. In the numerical analysis, the time domain solver of the electromagnetic simulator WIPL-D based on the Method of Moments is used.View full abstractDownload PDF (446K) -
Mitsuo TAGUCHI, Yuki NAKATAArticle type: Article
Session ID: BCT2016-2
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMIMO antenna composed of four unbalanced fed ultra low profile inverted L antennas on the rectangular conducting plane is proposed and numerically analyzed. The size of conducting plane is 55 mm by 184 mm. The design frequency is 2.4 GHz to 2.497 GHz. The distance between adjacent antenna elements is 58 mm. The parameters of two antenna elements on both side and two central antenna elements are independently optimized so that the scattering parameters. The correlation coefficient of the proposed MIMO antenna becomes less than 0.005. The electromagnetic simulator WIPL-D based on the Moment Method is used for the numerical analysis.View full abstractDownload PDF (4270K) -
Hirotaka UMEZAKI, Takayuki TANAKA, Ichihiko TOYODAArticle type: Article
Session ID: BCT2016-3
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, experimental evaluation of a three-element positive feedback type Push-Push oscillator array using injection locking technology is presented. The oscillator array consists of three Push-Push oscillators, two phase shifters and an injection circuit and it realizes a beam steering function with a simple configuration. However, the oscillation frequency changes when the output phase difference is changed. To solve this issue, we have tried to change the output phase difference at a fixed frequency by using an injection locking technology. In this study, characteristics of the oscillator array using the injection locking technology are experimentally evaluated. 220.4 degrees of phase shift was obtained between the adjacent oscillators at the synchronized frequency around 15 GHz. The phase noise was also improved by about 10 dB at 100-kHz offset frequency due to injection locking.View full abstractDownload PDF (8458K) -
Yuki TANAKA, Eisuke NISHIYAMA, Takayuki TANAKA, Ichihiko TOYODAArticle type: Article
Session ID: BCT2016-4
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, a new dual-feed planar array antenna integrated with a magic-T which employs a slot-line T junction is proposed. The proposed array antenna consists of four microstrip antenna elements and a magic-T which is a combination of a slot-line T junction and slot line-to-microstrip line T branch. Measured return loss and radiation patterns fed from each port are demonstrated by a prototype evaluation. This antenna can be applied to various advanced antennas such as a beam steering antenna and direction-of-arrival estimation antenna.View full abstractDownload PDF (4224K) -
Syuto Suenaga, Eisuke Nishiyama, Ichihiko ToyodaArticle type: Article
Session ID: BCT2016-5
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, we propose a dual-polarized microstrip array antenna and the results of the prototype evaluation are explained. The proposed array antenna consists of L-shape feed circuits and 45-degree inclined microstrip antennas. The proposed array antenna achieves dual polarization without 3-dimensional structures like an air bridge by effectively using planar Magic-Ts. The configuration of the proposed array antenna is presented first in this paper. Then, the design and operations of the Magic-T circuit and proposed array antenna are described in detail. The dual-polarized operation is also demonstrated by using a prototype array antenna.View full abstractDownload PDF (5125K) -
Mitsuo TAGUCHI, Shoji MORIArticle type: Article
Session ID: BCT2016-6
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSInverted L antenna formed by coplanar waveguide is printed on the dielectric substrate. This antenna is numerically analyzed and measured. The design frequency is 2.40 GHz to 2.50 GHz. The thickness of dielectric substrate is 2.4 mm, its relative permittivity is 2.6 and the loss tangent is 0.0022. When the size of ground plane is 16 mm by 43 mm, the Sll less than -10dB is satisfied from 2.40GHz to 2.51GHz. The calculated directivity is 3.44 dBi at 2.45 GHz. The measured S11 less than -10 dB is satisfied from 2.41 GHz to 2.51 GHz. In the numerical analysis, the electromagnetic simulator WIPL-D based on the Method of Moments is used.View full abstractDownload PDF (4290K) -
Takahiro KOGA, Takeshi FUKUSAKOArticle type: Article
Session ID: BCT2016-7
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSA sensor antenna which can detect the shift of the relative permittivity of concrete is presented. By reading difference of frequency of transmission power between transmitting antenna and proposed antenna, we can guess the status of object. At that time, in order to read difference of frequency clearly, we studied the way to enhance Q factor of transmitting power.View full abstractDownload PDF (4847K) -
Junpei Taguri, Takafumi FujimotoArticle type: Article
Session ID: BCT2016-8
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSAuthors have proposed a wideband printed inverted-F antenna. Although the frequency bandwidth of a conventional inverted-F antenna is approximately 10%, the proposed inverted-F antenna is wider than 100% by loading a rectangular element to the feeding element perpendicularly. However, this antenna has a problem of the radiation pattern. In this paper, by installing the trapezoid cavity behind the proposed inverted-F antenna the proposed antenna has unidirectional pattern and approximately uniform radiation pattern in the operating frequency bandwidth (2GHz〜6GHz). The frequency bandwidth of the inverted-F antenna with the trapezoid cavity is 97%, the gain are greater than 7dBi in 2GHz〜4GHz and 3dBi in 4GHz-6GHz.View full abstractDownload PDF (4308K) -
Ryota AOKI, Satoshi MORIMOTOArticle type: Article
Session ID: BCT2016-9
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSFollowing upon spectrum reallocation of 700/900MHz band, FPU (Field Pickup Unit) and Radio Microphone (type-A) in 700MHz band microwave must be shifted the operation frequency ranges to 1.2GHz and 2.3GHz, until the end of March 2019. This time We, Fuji TV succeeded to make an original antenna, which is applied to the new frequency range. It is contributed greatly to our stable relay system, which is used in many cases, such as operations of road race, wireless camera and Radio Microphone.View full abstractDownload PDF (22931K) -
Yasuyuki IKEGAMIArticle type: Article
Session ID: BCT2016-10
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe ocean thermal energy conversion has been expected in the use promotion as one of the stable renewable energy while an environmental problem and an energy problem are realized as an urgent problem on a global scale. In Saga University, R&D on OTEC has been investigated more than approximately 40 years and IOES has been taken the role as in the country and the overseas study base. In June, 2013, OTEC in Okinawa has been succeeded in grid connected operation system of the ocean thermal energy conversion ahead of the world. In this report, it is shown in the outline about a summary of the ocean thermal energy conversion in Saga University and a domestic and overseas trend.View full abstractDownload PDF (15120K) -
Mitsuo TAGUCHI, Tsubasa KONOArticle type: Article
Session ID: BCT2016-11
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSThe directivity of the circular polarized antenna composed of an unbalanced fed ultra low profile inverted L antenna and L shaped slot on the square conducting plane is improved by adding the square reflector located back of the conducting plane for the application of 900 MHz band RFID reader antenna. The size pf conducting plane is 135.6 mm by 135.6 mm and that of the reflector is 133 mm by 133 mm. In the numerical analysis, the electromagnetic simulator "WIPL-D" based on the Method of Moments is used.View full abstractDownload PDF (630K) -
Yujiro KAI, Takeshi FUKUSAKOArticle type: Article
Session ID: BCT2016-12
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSBroadband circular polarized patch antenna using artificial ground structure has a simulated S_<11> bandwidth of 48.6% and axial ratio bandwidth of less than 3dB of 21.2%. However, by changing shapes of the antenna, we attempted to stabilize the gain characteristics in relation to frequency.View full abstractDownload PDF (8614K) -
Takahiro Ino, Eisuke Nshiyama, Ichihiko ToyodaArticle type: Article
Session ID: BCT2016-13
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSIn this paper, a polarization agile planar antenna integrated with a double balanced multiplier is proposed to achieve small and versatile antennas. The proposed antenna is constructed with a microstrip antenna element and four diodes mounted at the center of each edge of the antenna element. As the diodes are connected in a star configuration, they form a double balanced multiplier which realizes a switching between the linear and circular polarizations by the diodes' bias voltage. Furthermore, horizontal/vertical polarization in the linear polarization and RHCP/LHCP in the circular polarization can be switched according to the polarity of the bias voltage. The principle and basic characteristics are experimentally confirmed.View full abstractDownload PDF (4555K) -
Kento MAEDA, Kiyotaka FUJISAKIArticle type: Article
Session ID: BCT2016-14
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSHigher frequency satellite systems are affected by the large signal attenuation caused by rain. To overcome this effect, it seems crucial to conduct some experiments to propose adapted systems. In order to develop such systems, it is necessary to conduct some experiments. However, the experimental condition is not permanently available and the experiments on satellite links are costly. Therefore, an indoor apparatus, which can simulate the satellite links, can be used usefully as the key tool for the development and improvement of satellite systems. We consider that ns-3 is useful for the simulation of the satellite link and evaluate the basic performance of it. In this paper, we report the validity of ns-3 on this simulation by showing the relation between the number of the packet errors and bit error rate (BER) when BER is changed in a period at various time.View full abstractDownload PDF (4672K) -
Junichi Honda, Takuya OtsuyamaArticle type: Article
Session ID: BCT2016-15
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSMulti-Static Primary Surveillance Radar (MSPSR) is expected to be used for conventional primary surveillance radar alternative which uses scattered waves caused by aircraft. MSPSR that uses not only present radar signal but also other communication signals, is classified into passive radar. Among them, digital terrestrial television broadcasting (DTTB) is the most expected radio waves to cover larger area because the transmitted signals are always present and the transmitted powers are relatively large. We investigate a new surveillance system using ISDB-T which was adapted to Japanese DTTB. In this paper, we report experimental results of aircraft positioning in order to suppress reflected waves from fixed structures.View full abstractDownload PDF (7974K) -
Takayuki SUZUMURA, Hirohito ITOArticle type: Article
Session ID: BCT2016-16
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSTV Asahi has continuously considered techniques of broadcast continuation at times of emergency disasters. When the head studio's function to send out digital programs is lost, transmitting broadcasting materials from affiliated broadcasting stations using SNG was considered to be one of the most effective methods to carry on with continuous broadcast. However, the technique of receiving SNG has been difficult due to strict conditions to set up an antenna on TOKYO SKYTREE[○!R], the master transmitting site in Kanto region. Yet, successfully, a solution to this problem has been found. The solution was to develop FPU/SNG shared reception antenna by extending bandwidth of standing FPU receiving antenna on a master transmitting site. This would enable technique to receive both FPU and SNG with one antenna. TV Asahi is currently working to achieve this, and so far the constructional designs have been completed. They are now at the stage of producing prototype of the antenna.View full abstractDownload PDF (11275K) -
Article type: Appendix
Pages App1-
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (82K) -
Article type: Appendix
Pages App2-
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (82K) -
Article type: Appendix
Pages App3-
Published: January 20, 2016
Released on J-STAGE: September 22, 2017
CONFERENCE PROCEEDINGS FREE ACCESSDownload PDF (82K)
- |<
- <
- 1
- >
- >|