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A microstrip patch antenna array with low-side lobe level, high gain and broadband is presented in this paper. A microstrip patch with one parasitical patch is proposed as a radiation element, and the antenna array is composed of 8×8 radiation elements. Then Chebyshev current distribution is used to design the feeding network on H-plane. The simulated results by CST Microwave Studio software indicate...
The use of curved reflectarrays for telecommunication applications is presented in this paper. For contoured beam applications, the curvature of the reflectarray surface can be used to enhance the bandwidth significantly, yielding reflectarray designs that are equivalent in performance compared to traditional shaped reflector antennas. For multiple spot beam applications, the curvature of the reflectarray...
This article presents a near-field magnetic multi-input multi-output (MIMO) communication system test bed using software defined radio (SDR). We propose a heterogeneous multi-pole loop antenna array for near-field magnetic MIMO system. In this paper, we show improved performance of the proposed near-field magnetic MIMO communication system over a conventional magnetic MIMO system employing a circular...
Multiple target tracking and separation techniques using ultra-wide-band (UWB) radar are promising for use in robotic and security-related applications. Some methods for tracking and separation of echoes from multiple targets using radar texture information have been proposed. However, the conventional methods cannot be implemented in real time applications due to its iterative nature. To resolve...
This paper describes the optimum directivity of a low base station antenna for street microcell. In order to simulate the propagation characteristics, the ray tracing technique is applied for street microcell. And, the channel capacity is evaluated for optimizing the antenna directivity. It is clarified by the simulation results that the optimum beam tilt angle and the beam width in the vertical plane...
Equivalent surface currents are known to grow to infinity close to a sharp edge. In the Method of Moments, the linear or higher order basis functions representing those currents are always finite. Special basis functions have been derived, that allow infinite currents on sharp edges, but their efficient use requires to know the exact analytical behavior. In this paper we derive this exact behavior...
This paper analyzes electromagnetic scattering problems for simplified crack models, based on the formulation of the Kobayashi Potential (KP) method. Here, three types of simple crack models, a flanged waveguide, a rectangular trough, and a thick slit, are considered. The derived far zone field representations are utilized to obtain the approximate formulae of the scattered fields for the models.
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...
We derive a periodic time reactance sequence of a parasitic element for 2-element dipole antenna which makes the antenna pattern biased sinusoidal, i.e., without undesired harmonic components. The characteristics can construct two branches for diversity and MIMO reception by the antenna with single RF front-end. Through analysis of the antenna patterns for various interelement distances we can obtain...
This paper presents a microstrip antenna (MSA) array on a narrow wall of a rectangular waveguide for linear polarization perpendicular to the axis. A two-element MSA array on a dielectric substrate fed by a longitudinal slot on the narrow wall of the rectangular waveguide is used as an element of the proposed array for grating lobe suppression due to the slot array arranged at a spacing of one guided...
The circular polarization is useful for the telecommunication, the sensor, the broadcast, and so on. One of the antenna is the radial line waveguide0slot array antennas. This structure are made from two plate for radiating waveguide. In this research, based on the theoretical calculation of the hybrid feed structure composed of the circular waveguide and coaxial feed and ring slot, and patch structure...
A new method for the synthesis of thinned periodic planar arrays with the constraint of maximum sidelobe is described in this paper. This way mainly depends on an inverse Fourier transform relationship which exists between the array factor and element excitations. Arrays can be thinned by setting the amplitudes of the element excitations to 1 and others to 0 during every iteration cycle. This paper...
In this paper, I will describe my personal expectations about electromagnetics analysis and simulation techniques for next 50 years. I wish this article would give your new research topic in electromagnetics analysis and simulation field.
W-band 3-dimensional (3D) printed reflectarray antenna for the millimeter-wave radar systems are designed and fabricated. The advantages of the reflectarray antenna so far are the simple and the flat structure. In addition to that, the low-cost fabrication can be achieved with fabrication by the 3D printer. The purpose of the paper is to achieve the 3D printed reflectarray antenna, which antenna gain...
In this paper, a bandpass filter (BPF) at 60 GHz band based on new design procedure is presented. The BPF is constructed by quartz-based post-wall waveguide (PWW) due to its lower dielectric loss. Filter design is achieved by optimization theory and burden for design is reduced by modeling filter as two dimensional structure. The 2D model is analyzed by using the method of moment (MoM) with global...
In this paper, when considering wireless communication systems, future outlook regarding signal processing antennas such as adaptive array and MIMO system in next 50 years is discussed. At present, signal processing antennas have been incorporated as MIMO system into the commercial systems such as Wi-Fi and LTE and one of key technologies in broadband wireless communication systems. On the other hand,...
Metamaterials are strongly expected to be useful for antenna miniaturization and high functionality. The composite right/left-handed transmission line theory has been proposed to expand to the left handed region. As a result, the degree of freedom of antenna design is enhanced and novel antenna can be achieved. In this paper, the metamaterial technologies are explained as three fields of the application...
A through-hole less microstrip line to waveguide transition is proposed in this paper. Conventional transitions are required through-holes in order to prevent unwanted emission in the substrate. However, the product cost of the transition is increased by making through-holes. In addition, the through-holes will be broken by heat deformation of the dielectric so that the characteristics of the transition...
The authors have proposed a method of estimating the location of the receiving terminal by a triangulation technique using DOD information from the multiple transmitters, which is calculated only from the Received Signal Strength Indicator (RSSI). In our previous study, DODs are calculated using four beacon signals, but the number of the antennas for each array is limited to two, which offers insufficient...
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