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A gap waveguide continuous beam steering antenna is proposed in the 60-GHz band for 5G applications. The antenna is composed of two parts: i) a quasi-TEM feeding network, ii) a slotted radiating plate. The relative mechanical rotation between the two parts generates a phase gradient across the radiating part and the beam radiated in the upper hemisphere can be scanned continuously. The antenna is...
A high data rate transmission system for short range application is proposed. The system is composed of two identical flat rectangular antennas separated by a distance in the non-far zone. Each antenna generates four two-dimensional orthogonal beams by a passive and low-loss beam-forming network. Thanks to the orthogonality relation between the beams, several channels with the same frequency and in...
We propose a 60-GHz radial line slot antenna (RLSA), which is fed by a Butler matrix, for orbital angular momentum (OAM) applications. The Butler matrix is placed at the lower layer and it is based on a post-wall waveguide structure. It has four input ports and it can launch different progressive phase states in the RLSA parallel plate waveguide (PPW). The RLSA in the upper layer is fed by the Butler...
We experimentally demonstrated millimeter-wave band beam forming of photonic array antenna composed of compact antenna modules in a Radio-over-Fiber (RoF) system with 1.3 μm light source, variable delay line (VDL), and multi-core fiber. It was confirmed that the antenna beam forming was properly operated by just tuning the optical delay.
A radial line slot antenna (RLSA) is a kind of slotted waveguide array for DBS reception [1][2]. It is free of conductor loss and the aperture efficiency is more than 75%, twice as high as conventional planar antennas [3]. Those performances have been realized for double-layered RLSAs with uniform slot length.
For the purpose of the realization of radio communication with high speed and high frequency utilization efficiency, we propose a 40 GHz-band full duplex radio system (called the Directional Division Duplex (DDD) system). The system realizes transmission and reception at the same time by using the same radio frequency and same polarization. We have developed the DDD radio system and performed field...
The one-body 2-D Beam-switching Butler Matrix and the 2-D Beam-switching Rotman Lens are compared. Those are designed to have sixteen 2-D arranged beams. Comparing the proposed Butler matrix with the Rotman lens, it has the low transmission loss, the high uniformity of distributed beams, and the small size. However when the number of 2-D arranged beams is increased, the size of the Butler matrix is...
A series-feed waveguide reflection-canceling 16×28-slot array antenna is designed for 60 GHz band in order to suppress the sidelobe level. The simulation by HFSS gives low-sidelobe by excitation of Taylor distribution, reflection lower than −13dB and gain higher than 33dBi over 60–61GHz.
This paper presents a design of a metal cap with two slots attaching at the edge of a mobile module substrate for a 60GHz-band wireless personal area network (WPAN). The metal cap is fed by a post-wall waveguide (PWW) converted from a micro strip line (MSL). The size of the metal cap is 8.01× 2.34× 4.45 mm3. The reflection is less than −11 dB and the realized gain is larger than 9 dBi over 57–66 GHz.
A 60GHz compact-range communication system is designed for coverage to 30cm width and 10m distance by an uniformly excited array antenna of a 64×64-element array antenna. The experiments showed that BER decays in non-far region which could come due to the ripple of the field. In this paper, we obtain new excitation coefficients to reduce the ripples thoroughly by using non-linear optimization.
Gigabit wireless access in the millimeter-wave band is very essential to the successful realization of 5th generation (5G) cellular network. Two kinds of systems have been developed: a mesh network composed of the 40 GHz-band Fixed Wireless Access system can be applied to realize the outdoor backhauls and fronthauls; on the other hand, a 60 GHz-band short-range wireless access system can be applied...
We propose and fabricate a 60 GHz-band compact photonic antenna module where a cavity antenna element and a photodiode as well as an optical fiber for RF power feeding are integrated. The operation of the fabricated photonic antenna is demonstrated, which is almost coincident to the simulation result.
The validity of proposed SFG model was verified by comparing our theoretical results of S21, S11 to originally obtained values. We also introduced weighted averaging method to improve parameters estimation accuracy.
In this paper, we demonstrate an E-band plate-laminated 16 × 16-element slotted waveguide monopulse array antenna with corporate-feed using the diffusion bonding technology. The proposed antenna architecture combines radiating elements, a corporate-feed circuit and a comparator, which are vertically interconnected to achieve a compact size and a reduced loss. The design, characterization, and experimental...
A dual-polarized corporate-feed waveguide 32×32-slot array antenna with an orthomode transducer is designed for 40 GHz band (41∼42 GHz) in order to integrate their two input ports. The simulation by HFSS gives the bandwidth for VSWR lower than 1.5 of 6.5 % (S11) and 3.8 % (S22), respectively, at the design frequency of 41.5 GHz. S12 is achieved less than −20 dB over the bandwidth. The simulated realized...
In this paper, we aim to design a waveguide feeder for a parallel plate slot array antenna for a high resolution Synthetic Aperture Radar system on-board a 100 kg micro-satellite called Micro-XSAR, scheduled to be launched by Japan Aerospace Exploration Agency by 2020. In order to increase the antenna beam-width and thereby mitigate the frequency-dependent beam-shift, we employ center feeding using...
We propose a novel 60-GHz compact antenna module integrated with photodiode. The module is actually designed and fabricated, and it is successfully demonstrated that the antenna beams of 1×8 and 2×4 arrayed modules can be remotely controlled by tuning wavelength of 60-GHz RoF signals.
This paper presents GPU parallelization for a computational fluid dynamics solver which works on a mesh consisting of polyhedral cells, where each cell has an arbitrary number of faces and each face has an arbitrary number of vertices. The parallelization is achieved using NVIDIAs compute unified device architecture (CUDA). The developed code specifically targets performance improvement on NVIDIA...
We demonstrate 3.5-Gbit/s QPSK signal transmission in radio-over-fiber system with beam forming of a 60 GHz-band integrated photonic array-antenna. The relationship between beam forming operation and signal quality is quantitatively confirmed.
A trial to generate the object in the natural world by computer graphics is now actively done. Normally, huge computing power and storage capacity are necessary to make real and natural movement of the human's hair. In this paper, a technique to synthesize human's hair with short processing time and little storage capacity is discussed. A new Space Curve Model and Rigid Segment Model are proposed...
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