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This paper proposed a high efficient parallel scheme of method of moment (MOM) with RWG basis function to examine the far-field characteristics of electrically large antenna array used for target location. The antenna array is composed of three millimeter-wave conical antennas, which are symmetrically arranged on a spherical surface and geometrically focus on a point far away. Each antenna unit is...
Dynamic manipulation of light at nanoscale is highly important for many applications, including optical security systems, optical tweezers and compact optoelectronic devices. A number of tuning methods using thermal, mechanical, optical, and electrical mechanisms have been reported. Among all, electrical tuning, based on incorporation of phase-change media, is the most prevailing thanks to on-chip...
The radiation pattern of a balance dipole antenna feeds with odd mode (or differential mode) transmission line is symmetry for H-plane pattern. Unfortunately, if the transmission line is a single ended or defect odd mode the radiation pattern will be vector summation of antenna itself and the unbalance transmission. Except for the distorted radiation pattern, the impedance will also be affected by...
TEM horn antenna is a kind of ultra-wide band antennas. Ultra-wide band antenna can make a pulse signal have minimum distortion through radiation, namely the smaller the impulse response trailing is. TEM horn antenna radiate TEM spherical wave. It is limited by center of antenna port and the edge phase difference, so generally it requires a small horn flare angle. There are many loads in the TEM horn...
This paper presents the design of tri-band planar dipole antenna for PCS and WLAN services. A modification is made in the previously presented dipole antenna design [1]. The configuration of the proposed dipole antenna is given in Figure 1(a). The antenna design consists of a printed dipole and two parasitic elements which are behaving as resonators by coupling from the driving element. The proposed...
In the last few years, the possibility to engineer the properties of artificial Metamaterials at microwave, THz, and optical frequencies has represented one of the key factors enabling the study, development, and demonstration of effective electromagnetic cloaks [1]. Indeed, several devices have been proposed which are able to manipulate the wave propagation not only to reduce radar cross section,...
A simple and quick model is explored to analyze the radiation of the pigtail-terminated coaxial cable in this paper. Unexpected radiated electromagnetic interference is produced due to the pigtail and influences the surrounding equipment. To study the mechanism of the pigtail effect, the actual pigtail connection is modeled as two transmission lines cascade connection. The currents on the transmission...
The paper presents a wideband omni-directional horizontally polarized (HP) antenna utilizing four modified T-bar fed cavity-backed slot antenna (CBSA) elements. The wide bandwidth of the antenna is guaranteed by the wideband CBSA elements. The proposed antenna achieves a 76% (443MHz ∼ 992 MHz) bandwidth for VSWR ≤ 2. The antenna size is 260mm × 260mm × 420 mm, which is 0.38λL × 0.38λL × 0.62λL (λL...
The optimized metasurface layer is introduced into antenna design, which is generated by dividing a 2-D rectangular area into some grids, then the initial 2-D chromosome population is produced randomly. The size of population is the number of grids, “1” represent the metallized areas and “0” represent the areas without metal. Based on this model, we optimized two parasitic metasurface layer under...
In this paper, a compact dual-polarized printed dipole antenna with wide band is proposed. This design employs two techniques to improve its performances. Exponential curve lines are employed to improve the impedance matching. Horizontal slots are used to miniaturize the surface area of this antenna. The dimension of this single polarization antenna is 63mm × 47 mm. The dual-polarized printed dipole...
A dual bands three elements printed sleeve dipole antenna array with beam direction at boresight direction has been developed for the application of IEEE 802.11 a/b/g. The size of sleeve dipole antenna array is 220mm in length, 8mm in width, and 0.4mm in thickness The beam direction always points at the boresight direction even if for various frequency operation.
Radio frequency identification (RFID) in the UHF band and its supporting communication technology has received increasing research interest recently. RFID has several benefits over the conventional method of identification, such as a higher reading range, faster data transfer, and ability to simultaneously read a massive amount of tags. An RFID tag consisting of a microchip and an antenna is an important...
In this manuscript, a novel design of millimeter-wave (mm-Wave) dipole phased array antenna for the fifth generation (5G) handset applications is proposed. The proposed antenna is designed to cover some of the candidate bands for 5G communications from 24 to 50 GHz, and has dimension of 8×5.5mm2. The antenna exhibits small and wide bandwidth. The beam steering characteristics in the operation band...
Nano antennas have been proved to be a good platform to tune the emission properties of a localized source, e.g., an electric dipole [1]. Besides the enhancement of the emission efficiency, it is also feasible to control the radiating directivity of a dipole by utilizing the plasmon modes of these antennas. Here we show that both the forward and backward unidirectional radiation can be realized by...
The hybrid material generally means artificial magnetic materials such as the AMC/ENG/MNG. In this paper, three types of antennas (Dipole/loop/Monopole) which it is generally applied to a wearable communication were designed for WBAN system. The Study on the technology of WBAN (Wireless Body Area Network) continues development and it is useful in mobile communication, medical services. The WBAN systems...
A novel Quasi-Yagi antenna was proposed with ultra-wideband and miniaturization characteristics. The butterfly dipoles and parasitic branches are adopting to improve the bandwidth of the Quasi-Yagi antenna. Affections of antenna structure parameters on antenna was analyzed in this paper. After optimization, the operating frequency ranges from 3.3 to 10.2 GHz. Meanwhile, gain is more than 5.1 dB, and...
Advanced wireless communication applications demands antennas with enhanced radiation properties over a wide bandwidth. Log Periodic Dipole Antenna array (LPDA) is a new class of antennas that provide constant radiation properties over a wide bandwidth. In this paper, modified planar log periodic antennas are proposed which assure an enhanced gain of 15 dBi at 2.45 GHz. Two designs of LPDA are analysed...
In this work, a low profile single-layer radio frequency identification (RFID) tag antenna is described, which is mountable on both metallic and non-metallic structures with different permittivity characteristics. The proposed antenna is an unsymmetrical dipole antenna, capacitively fed by a loop for conjugate matching. The 3 dB power bandwidth of the antenna is around 140MHz when mounted on the log,...
In this paper, sierpinski-shaped dipoles are introduced in a printed log-periodic dipole antenna design. A Log Periodic Sierpinski Antenna (LPSA) is developed and the characteristics studied. Antenna size is considerably reduced, still maintaining the overall performance characteristics. The results are compared with that of a standard printed LPDA. A set of shapes of LPSA are studied and the observations...
In a ZigBee network, low-cost, low-power sensor nodes are deployed to carry out specific tasks like environment sensing, home automation, human and animal condition monitoring, and robot navigation monitoring etc. Normally the network comprises of numerous sensor nodes deployed in different locations and a coordinator node where the sensor nodes report back the sensed data for possible analysis and...
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