In this paper, a printed wideband Yagi-Uda antenna with a novel folded dipole driver is proposed. The folded dipole driver is comprised of a folded dipole and a microstrip feedline which functions as an internal balun to mainly determine its wide impedance bandwidth. With the optimized parameters, an operating band of 1.69 GHz ∼ 2.72 GHz can be obtained. Besides the folded dipole driver, the br...

In phased array antennas, the number of radiator rows is one of the important factors to minimizing both cost and weight. Therefore, the antenna tilt angles having relation with the element spacing are among the important design parameters. In this paper, the optimum tilt angles for several types of dipole planar arrays are investigated theoretically. To obtain optimum tilt angles, the directiv...

In this paper, a miniaturized printed dipole antenna with the V-shaped ground is proposed for radio frequency identification (RFID) readers operating at the frequency of 2.45 GHz. The principles of the microstrip balun and the printed dipole are analyzed and design considerations are formulated. Through extending and shaping the ground to reduce the coupling between the balun and the dipole, th...

In this paper, a triple-band printed dipole tag antenna is proposed for RFID application. The tri-band printed dipole antenna is designed at 0.92 GHz, 2.45 GHz and 5.8 GHz using Computer Simulation Technology (CST). In order to achieve triple-band operation, the proposed antenna contains two branch elements, which acts as an additional resonator. The designed antenna was fabricated using Taconi...

In view of the development for TD-SCDMA communication system and combine with the miniaturization technology of smart antenna, by using balun feeding structure and consist of splitters and neural networks, this paper proposed a four units of dual polarized and a eight units of +45/-45 polarized antenna array which on the basis of printed dipole antenna. The simulation results show that the isol...

The effect of surrounding an electrically small dipole antenna with a shell of double negative (DNG) material ( 0 and 0) has been investigated both analytically and numerically. The problem of an infinitesimal electric dipole embedded in a homogeneous DNG medium is treated; its analytical solution shows that this electrically small antenna acts inductively rather than capacitively as it would i...

This paper is focused on the analysis of the current distribution of symmetrical full-wave dipole antenna based on double and triple feeding techniques; the current distributions were measured using a shielded loop protruding through a slit in the antenna surface along its axis, gives exact and accurate measurement rather than sinusoidal approximation. However, the sinusoidal distributions of c...

The intent of this paper is to compare two designs of RFID antenna which is used for Ultra High frequency (UHF) and Ultra wideband (UWB) applications. Here the comparison of Hybrid design and XETS design is done. In hybrid design the antenna simultaneously operate on both the bands viz.UHF as well as UWB. In XETS design antenna operates only for UWB. Hybrid antenna is planar antenna. There is a...