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The surface roughening and crack generation during the HVPE growth on the MOVPE-grown semipolar GaN template were successfully suppressed by using SiO2 striped masks perpendicular to the a-axis on the semipolar GaN template. The growth toward the-c-direction during the MOVPE growth was also successfully suppressed by using the growth temperature control; this resulted in a large reduction in the formation...
An ultra-wide band (UWB) antenna with band rejection on the range of the wireless local area network (WLAN) is proposed. The antenna consists of a radiation element with broadband radiation and a nonuniform microstrip line for necessary band rejection. The nonuniform microstrip line is designed by the inverse scattering technique. A fabricated antenna is well designed and radiates properly in the...
Recently, many countries are switching their terrestrial television broadcasting from analog to digital and the demand of TV reception increases for mobile devices and automobiles. The antenna for this purpose is required to be compact, light-weight. It is also desirable that the antenna can work even located close to neighbouring objects, especially metallic ones, so as to be installed into narrow...
A film-antenna capable of generating two wide resonant modes for covering the AMPS/GSM bands and the DCS/PCS/ UMTS bands for mobile phones is proposed. The antenna consists of two superimposed radiating arms which can support two resonant modes by themselves. The frequency range of a resonant mode generated by one of the arm is arranged to differ a little with the corresponding mode of the other,...
In this paper, we propose a novel wire type antenna for GSM/DCS/PCS/UMTS operation. The antenna is constructed by a folded wire with a short-pin section. Meander lines are applied not only for the miniaturization purpose of the antenna but also for the arrangement of the operation frequency. The short-pin section is enlarged by meandering means which broadens the operation bandwidth of the antenna...
We developed a PIFA made of flexible printed circuit, which is available for Bluetooth and IEEE802.11a/b/g applications. We measured the characteristics of the antenna when it is folded along the coaxial cable. It is shown that the characteristics do not vary much when the angle of folding is less than 90deg. The performance is confirmed by a simulation based on the FDTD method. The antenna is expected...
A novel film antenna is proposed for GSM/DCS/ PCS/UMTS operation in mobile phones. The antenna is constructed by a planar structure which consists of a folded arm and a short-pin section. Meander lines are applied not only for the miniaturization purpose of the antenna but also for the arrangement of the operation frequency. The short-pin section is enlarged by meandering means which broadens the...
Highly-efficient green laser light source with excellent uniformity periodically-poled MgO:LiNbO3 frequency doubler is achieved. The present result supports the prospect of realizing compact and high power visible and UV source for industrial and consumer applications.
The style of agriculture practiced in Japan and other countries in Asia is small scale compared to that in North America. While systematic production and management systems have been maintained in Europe and America, Japanese agricultural style tends to depend on past experiences, and application of agricultural chemicals is guided by the calendar and past experiences. Japan is also advanced in the...
In this paper, we propose a robustness data collection and fault detection method for large-scale sensor networks, which consist of ten thousand sensor nodes. The sensor network has some special features as multihop communication, data aggregation, and high error data rate caused by the huge number of nodes. To tackle this issue, we propose a distributed and self-organized method for data collecting...
We propose a new on-line modeling and rendering method for visualizing players in sports. This method targets the intricate geometry of players in sports such as wrestling. Our system can maintain modeling and rendering quality on producing free-viewpoint 3D video of the players by utilizing the virtual viewpoint information of the viewer. Viewers can move a virtual camera freely over the scene while...
In this paper, we clarify the dependence of the antenna performance on frequency and the antenna geometry for transparent monopole antennas. Radiation efficiency is numerically investigated for antennas with different geometries by use of the moment method. The confirmation of the simulation and the optimization issue are discussed.
A multi-layer NMS was successfully developed to manage the optical network and the MPLS network. The integrated network-planning tool could appropriately provide the optimized routes for a new LSP and all the existing LSPs.
This paper proposes a combined adaptive congestion control method for massive and intensive telecommunication traffic expected in communication-broadcasting integrated services. The proposed method adaptively controls data transmissions from viewers by combining transmission restriction and delayed transmission depending on the congestion states, so that the severe congestion can be avoided effectively...
This paper proposes an adaptive control method of delayed transmission for massive and intensive telecommunication traffic expected in communication-broadcasting integrated services. It furthermore presents quantitative evaluation of the proposed method through computer simulations and experiments using a test bed. Communication-broadcasting integrated services, which have been started by the terrestrial...
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