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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...
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...
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...
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 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...
This paper presents a fan-beam patch antenna array with low cross-polarization. The proposed antenna array consists of 13 sub-arrays and each array has 7 elements. The element distance in each array is equal, whereas the distances between the sub-arrays are designed to be different in order to decrease the radiation in the side lobe level. Narrower beam width and lower side lobe level can be realized...
With the current state of affairs in the development of antennas in the wireless communication field, the need of compact multiband, multifunctional and cost effective antenna is increased. The study of reconfigurable antennas has made great progress in recent years. In this article, a multi-purpose reconfigurable antenna capable of dual-polarization and operating nine modes corresponding to nine...
A printed log-periodic dipole antenna (PLDPA) with balanced feed structure is proposed. The traditional feeding structure using a single coaxial cable and feed lines with equal width will lead to an unbalanced current distribution, thus, the radiation pattern performances a frequency dependent deflection status. In this paper, we have modified the width of two feed lines to compensate the effect of...
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