The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We present a discontinuous Galerkin augmented electric filed integral equation, hereafter referred to as AEFIE-DG, for low-frequency electromagnetic analysis. This augmented equation is obtained by combining the discontinuous (DG) electric field integral equation (EFIE) with the current continuity equation. Surface and line charges, which reside respectively on the discretization elements and their...
A compact planar transmission-line transition direct-connecting from a waveguide to four microstrip-lines is designed in the submillimeter-wave band. Microstrip array antennas are fed from the back at the center of the antenna for wide frequency bandwidth. To reduce the size of the center feeding circuit, the direct connection of all four microstrip lines into the waveguide is advantageous for radiation...
This paper proposes a two-dimensional beam scanning of optical antenna by waffle waveguide on a silicon wafer. The beam in azimuth is steered by changing the input direction of propagating wave into waveguide. Four silicon wires are excited with phase difference to switch the propagating direction. The elevation beam angle is steered by sweeping input wavelength of leaky waffle waveguide. The design...
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.
A wireless power transmitting system for a traveling mobility scooter based on magnetic resonance has been developed. In the system, we have prepared 2 kinds of loop: ordinary square loop and fractal loop. In this paper, we demonstrate that the fractal loop can keep high efficiency in spite of lateral positioning deviation with a fixed matching circuit.
As an advanced operation of synthetic aperture radar (SAR), circular SAR (CSAR) has attracted more and more attentions, because it can achieve higher spatial resolution than conventional linear observation SAR due to considerably larger aperture angle. However, CSAR image is greatly distorted when the target is located away from the central axis position of the circular orbit because of different...
Multi-user MIMO (MU-MIMO) realizes a high channel capacity with a little limited number of antennas at user terminals. On the other hand, MU-MIMO needs a channel state information to obtain the transmit weight of beam forming. The distributed antenna system (DAS), which switches the high density arranged antennas according to user distribution in indoor environment, has been proposed. In this paper,...
Automatic operating system for vehicles has been widely studied. Especially millimeter wave (MW) automotive radar has been attracting attentions. Although synthetic aperture radar (SAR) by using MW radar can obtain a high-resolution 2-dimensional image, an amount of observation data become huge. Compressed sensing (CS) is a method of solving this problem. In this paper, we provide some simulation...
This paper presents a Compact Dual-Circularly Polarized Corrugated Horn with Integrated Septum Polarizer in the X-band. Usually such a complicated structure would be fabricated in parts and assembled together. However, exploiting the versatility afforded by Metal 3D-printing, a complete prototype is fabricated as a single part, enabling a compact design. Any variation due to mating tolerance of separate...
When covering Malaysia area by multi beams in satellite antenna, many feed horns are employed. In a previous designing, severe horn overlapping was shown. In this paper, overlapping problem of feed horn is analytically studied. The relation of feed horn size and feed position displacement is numerically clarified with parameter of the beam separation angle and F/D of a parabolic reflector. As a result,...
This paper investigates the performance of wireless communications using orbital angular momentum multiplexing in terms of modulation/demodulation, multiplexing/demultiplexing, and power control. This work enabled us to clarify the effect of mode-dependent power attenuation and provides insight regarding the potential and limitations of OAM-based wireless communications.
Packet relay-assisted scheme using sectorized receiving at relay station has been proved as an effective solution to mitigate hidden terminal problem, and then improve performance of ITS V2V communication. In addition, it is also shown that performance of the relay-assisted scheme relies on separation of the sector antenna unit which is basically expressed as front-to-back (F/B) and front-to-side...
The work scheme of this paper represents the new design of a dual-band coplanar waveguide feed (CPW) antenna with a concept of fractal and coplanar to provide dual-band and Omni-directional radiation. Each Verre de Champagne fractal geometry response an individual frequency by the larger shape operates at lower frequency whereas the smaller shape operates at RF altimeter frequency band. This type...
This paper demonstrates a UHF- and 60-GHz bands antenna with single feed structure for 5G terminal application. The single feed structure by a coaxial connector is used in the proposed antenna to be integrated with the dual-band frontend. A meander-line-antenna and a circular patch antenna is adopted for UHF- and 60-GHz-bands operation. Gains of 1.8 dBi at 795 MHz and 7.8 dBi at 62 GHz is achieved...
We propose a sparse array antenna using radiation pattern reconfigurable antenna. The sparse array radiates grating lobes on undesirable directions and decreases the gain on the desired direction. In order to overcome the problem, we apply a radiation pattern reconfigurable antenna to the element of the sparse array. A feature of the proposal antenna is applicability to two dimensional beam scanning...
This paper presents a beam switched antenna using inverted F antenna for mobile terminal application in satellite communication. The antenna produces unidirectional radiation patterns in yz-plane which can be switched in two directions using a simple feeding circuit. This paper discusses the prototype antenna as well as the feeding circuit which is fabricated to demonstrate the switching of the beam...
Recently, MIMO (Multi-Input Multi-Output) transmission technique is one of the most promising technique as it can satisfy the demand for exponential data traffic in mobile communications, especially for multipath-rich environment. In this paper, we proposed an antenna design which can operate in the 2.6 GHz and 3.5 GHz bands and produce an orthogonal bi-directional radiation pattern. Antenna performances...
A new combing method of Adaptive Array Antenna for ISDB-T Mobile Reception system is proposed in this paper. From experimental results, it is clarified that the BER performances of the proposed system are superior to the conventional system.
A novel broadband dual-polarized antenna array for base station applications is proposed. The single radiating element is required to perform wide band, dual-polarization and high radiation efficiency. In addition, we have integrated the structure into array and discussed the performance. The bandwidth covers from 2.6–3.8 GHz. By applying isolators and a bended reflector, high isolation and high front-to-back...
The evaluation of the radiation pattern of the antenna is important to design the wireless communication system. In the millimeter wave, the antenna size is smaller than the connector and feed pin. Therefore, a connector has to place in the side of the antenna, and has influence to the measurement result of radiation pattern. In this paper, the influence of the connector is discussed, and structure...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.