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For the next generation (5G) mobile base station antennas, authors are developing a cylindrical lens antenna featuring a simple configuration compared to the present array antenna configuration. In order to achieve a cylindrical lens antenna, feed element should produce a bifurcated beam radiation. In this paper, the bifurcated beam is conformed by a bend array configuration. Relations of array element...
For satellite communication, precise Malaysia coverage is requesting. In this paper, multi beam coverage is studied. In order to arrange multi beams at exact positions, exact feed position are determined through focal region ray tracings. Then, a multi beam reflector antenna is designed and beam allocations are examined. Adequateness of feed position determination is ensured by exact beam position...
Unequally spaced arrays technique offers an alternative for limited sidelobe level reduction compared to conventional array antennas with equally spaced elements. In this paper, the abilities and design of microstrip linear array antenna, fed by multiport feeding with uniform excitation coefficient in all array elements are presented for sidelobe level reduction at 28 GHz. By using the proximity coupled...
Reflector antennas remain the most preferred option for satellite communication. However, some applications require the beam to be shaped precisely to the specific coverage region in order to provide high data rate services with constant signal availability. As for small region like Malaysia, it is very crucial to obtain precise beam shaping because it is located nearby other countries thus, unnecessary...
This paper presents the design of serial feed radiators in cylindrical lens antenna system for mobile base station application. The authors are developing a cylindrical lens antenna featuring a simple configuration compared to the present array antenna configuration. In order to achieve the cylindrical lens antenna, bifurcated beam radiation shall be produced by the feed elements. In this paper, the...
The dielectric metamaterial lens antenna for wide angle beam scanning is discussed as an applicative antenna. The availability of the low-loss structure using dielectric resonator and the cause of the reduction of the antenna efficiency are clarified by the electromagnetic simulations. The validation of the design of the metamaterial lens antenna is clarified through the experiment.
In this paper, the low-profile radiation-pattern controllable antenna is presented. The diskloaded monopole antenna (DLMA) with four slits is designed for low-profile radiation element. And, planar CRLH-PE composited of the mushroom structures is designed. It is cleared that the DLMA and the CRLH-PE with the height of 0.03λ at 750 MHz can couple each other. The radiation patterns can be controlled...
Aperture antennas for wide angle coverage applications such as multi-beams and scanning beams have been developed previously. Researchers have also developed a convenient dielectric lens antenna with an array feed for wide angle beam scanning. In this paper, the primary technologies used in dielectric lens shaping, array feed design, and fabrication methods of a practical antenna are shown. Further,...
The practical array feed is achieved through developing the array element and the power divider. Important technical results developed are summarized as follows. (1) As array element antenna, the convenient patch antenna configuration is developed. (2) For the 30deg beam scanning, the 8 branch power divider is fabricated. Accurate excitation coefficients are ensured through the measured results. (3)...
The pattern-controllable novel small antenna with CRLH-PE has been proposed. The distance between the radiator and the parasitic element of the proposed antenna is 1/20 of wave length. The directivity in arbitrary direction is obtained by resonation of an appropriate PTLH-PE in the usable frequency band of the dipole antenna. The minimization of the radiator is future study.
In this study, a composite right-/left-handed transmission line (CRLH TL) is used as a parasitic element. It is shown that a right-handed (RH) dipole antenna with the CRLH parasitic element has band rejection characteristics. Moreover, transmission characteristics and electric field distribution confirm that mutual coupling between the two dipole antennas can be reduced by using CRLH parasitic elements...
In the recent ITS (Intelligent Transportation Systems) services using millimeter wave frequency bands, dielectric lens antennas were studied for a radar system of adaptive cruise control (ACC) of automobiles. Authors developed a shaped dielectric lens antenna which was suitable for wide angle beam scanning and beam scanning abilities were ensured. Moreover, by introducing an array feed of rectangular...
In order to increase beam shapes and antenna gains, patch array feed for the shaped dielectric lens antenna is developed. Important technical progresses are summarized in the following. The array element patch antenna that has the similar radiation patterns as a rectangular horn is developed. Excitation coefficient of the patch array feed is obtained through the radiation pattern synthesis method...
In ITS services, millimeter wave frequency bands are used and antennas are required beam scanning ability. Wide angle scanning can be achieved by introducing Abbe sine condition to lens surface shaping. Authors designed a lens antenna that could achieve beam scanning over plusmn30deg. Narrow beam widths were maintained on the scanning planes. However, beam shapes were distorted on the transverse planes...
In this paper, many electrical characteristics of an antenna mounted on a care are calculated with a MoM simulator. The W-loop antenna is attached on a rear window. In this case, the antenna is surrounded by heater lines of a defogger. At first, electrical characteristics of the W-loop antenna are summarized. Next, electrical characteristics of the antenna mounted on a car are calculated. Here, influences...
The dual polarized characteristics of shaped reflector antennas with omni-directional coverage were examined. Target radiation patterns for vertical and horizontal polarizations were achieved by using a common reflector
One of the problems in power-line communications (PLC) is an unnecessary radiation due to the electrical unbalance of power-lines. However, it means that power-lines can work as antennas. In this paper, a beacon signal radiation system by the power-line antenna for time synchronization among wireless and wired nodes is proposed. The considered application of the radiation system is an indoor fine-grained...
On-board antennas of 2.5/3.5 m in diameter which cover Japan with 13 beams in 30/20 GHz bands are developed. To achieve intense frequency reuse, a 9-horn cluster feed is adopted. A tower mounted type deployable antenna configuration is selected so as to overcome the fairing envelope limitation
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