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In this paper, the particle swarm optimization (PSO) method is applied to optimize the antenna radiation pattern of conformal array. In order to prevent PSO method from getting stuck at a local optimum, we improve the traditional PSO method by using inertia weight factor. The amplitude of each antenna element could be obtained by the proposed PSO method efficiently. To demonstrate the effectiveness...
In this paper, a kind of novel jigsaw EBG structure is designed and applied into conformal antenna array. The stop band of jigsaw EBG structure is simulated. And the 4-element antenna array with Taylor amplitude distribution is considered. The effect of EBG structure on the side-lobe level of antenna array radiation pattern is investigated.
In this paper, the particle swarm optimization (PSO) method and genetic algorithm (GA) are combined and applied to optimize the antenna radiation pattern of conformal array. We improve the traditional PSO method by using inertia weight factor and prevent PSO method from getting stuck at a local optimum. And circular and cylindrical conformal antenna arrays are investigated, respectively. Compared...
In this paper, a novel CP circular waveguide antenna array is proposed. The dielectric loaded antenna element is fed by a microstrip structure. Square and triangular arrays are compared. And the beam-scanning characteristics is discussed. The triangular antenna array is fabricated and measured.
A kind of V-shape-meander-line reconfigurable electromagnetic band-gap (EBG) structure is designed in this paper. The proposed EBG structure is fabricated and measured. It is found that miniaturization and frequency reconfigurability of EBG structure can be realized.
In these years, electronic toll collection (ETC) system has developed rapidly in China. However, adjacent-lane communication interference has become a serious problem for high vehicle density case. In this paper, the field distribution of the communication zone of ETC system is simulated by hybrid FDTD-PO method. Firstly, the roadside unit (RSU) antenna is simulated by the FDTD method. Secondly, the...
In this paper, we present a novel ultra-wideband (UWB) antenna with the reconfigurable notch band. The proposed antenna consists of an elliptical-shaped patch, a 50-Ohm CPW feed line, and a tapered ground plane. To obtain reconfigurable notch band, the ring-shaped slot structure with several switches is added into the patch. Effect of several antenna design parameters on the input and radiation performance...
In this paper, an efficient calculation approach on radiation pattern of conformal array antenna is presented by using far-field data of antenna element. To demonstrate the computational accuracy of the proposed method, a 16-element cylindrical array antenna is simulated as an example. And the simulated results are compared with those of HFSS. Then the performance of the virtual phase shifting technology...
In this paper, a novel design of printed Yagi antenna is presented. To improve the input and radiation performance, the driver and directors are modified. And the simulated results are compared with the measured data. This proposed antenna achieves a measured 10% bandwidth for VSWR<2, better than 11.9 dB front-to-back ratio, and 8.3 dB absolute gain across the operating bandwidth. Furthermore,...
In this paper, a wideband conformal invert-F antenna structure is presented. Firstly, the effect of several parameters of the proposed planar inverted-F antenna on the input performance is discussed. Secondly, a conformal inverted-F antenna is simulated. Finally, the simulated results are compared with the measured data.
In this paper, we present a UHF-band compact conformal dipole antenna. Firstly, a planar dipole antenna is designed. And several parameters of the planar dipole antenna structure are discussed in detail. Secondly, the conformal dipole antenna mounted on the cylindrical body is simulated. Finally, the small conformal dipole antenna is fabricated and measured.
Radiation performance of the UHF-band invert-F antenna array on the cylindrical metal body is analyzed. Firstly, a low-profile UHF-band inverted-F antenna structure is designed. And several design parameters of the inverted-F antenna are discussed. Secondly, two kinds of the inverted-F antenna array on the cylindrical metal body are simulated. And the effect of the supporting structure on antenna...
In this paper, a novel dual-band modified E-shaped antenna is proposed for wireless application. In order to achieve the 2.4/5.8GHz dual-band performance, the stub structure is added into the E-shaped patch antenna. The effects of several fundamental design parameters of the novel antenna structure on reflection coefficient are investigated. It is found that the two operating bands of the proposed...
A novel design of dual-linearly-polarized antenna for Ku-band satellite communication system is presented in this paper. This antenna consists of a patch, a circle-ring slot, and a cross slot on the upper layer of substrate. The circle patch is aperture-coupled by two microstrip lines to generate dual orthogonal linearly-polarized waves. The effect of feed network on the reflection coefficient is...
In this paper, a hexagon electromagnetic band-gap (EBG) structure is designed and applied into spaceborne antenna. By using surrounding periodic electromagnetic band-gap structure, a circularly-polarized spaceborne antenna operating at S band is designed. Taking spin-stabilized and three-axis-stabilized microsatellite platforms as examples, the antenna radiation performance, such as beamwidth and...
In this paper, a novel design of compact patch antenna with wavy-slot structure is presented. Input and radiation characteristics of an S-band wavy-slot patch antenna are studied. Furthermore, effects of several design parameters, including outer radius of the semicircle of the wavy slot, slot width, distance between slots, and feeding point position on reflection coefficient and radiation pattern...
A three-dimensional finite-difference time-domain (FDTD) method is applied to analyze the performance of a dual-polarized wideband patch antenna in this paper. The simulated results obtained by the FDTD method are compared with measured data. And effects of different design parameters, including inner and outer radiuses of annular-ring slot, cross-slot width, and feed-line length, on the antenna performance...
Input and radiation characteristics of compact circularly-polarized (CP) patch antenna with bent slots using in the microsatellite formation flying is analyzed by the method of moments (MoM) in this paper. Firstly, the CP antenna with finite ground plane is simulated by the MoM based on the Schaubert-Wilton-Glisson (SWG) basis function. Then effects of several antenna design parameters, including...
In this paper, we investigate effects of several design parameters, including turn number and unit cell size, on the stopband performance of rectangular spiral EBG structure by HFSS. The results of conventional EBG structure and rectangular spiral EBG structure are compared. In addition, the spiral EBG structure is applied into microstrip antenna. It is demonstrated that gain and FBR are improved.
The input impedance and radiation characteristics of spaceborne helix antenna using in the LEO microsatellite formation flying are studied theoretically by the method of moments (MoM) in this paper. A helix antenna model with finite ground plane is simulated by the MoM based on the Rao-Wilton-Glisson (RWG) basis function. The effects of several design parameters, including turn number, pitch, and...
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