In this paper, we propose a THz antenna design based on a scaling method from a microwave antenna, a meander line dipole antenna resonating at 790 MHz, which was analyzed over a broad frequency band and it was determined that the best features are achieved at 6 GHz. The scaled meander line dipole antenna presents a maximum directivity of 2.33 dBi at 10 GHz. Determine the gain of the meander antenna by reflection on a conductive wall.
Measuring the radiation characteristics of an antenna is an important step in the design process. In most cases, antennas are used in complex propagation environments, substantially different from the ideal model of the free space, where the presence of obstacles leads to multiple propagation pathways, and in some cases, when the obstacles are very close to the antennas, they become part of the radiating element. However, the characterization of an antenna is usually done in measuring sites with characteristics as close as possible to those of the free space. In most cases, such measurements are performed in an Open Area Test Site location (OATS), cleared enough of obstacles, or in an anechoic chamber. In this paper we investigate the application of the distance averaging method for antenna gain measurements in the side or back direction. The approach was successfully validation through measurements on a log-periodic dipole array (LPDA) in a regular office room.
In this paper, we propose a radar cross section analysis for frequency selective surfaces using a meander line antenna as a unit cell. The periodic structure consists of a passive copper antenna backed by a dielectric substrate. Two configurations of constant aperture composed of three and five elements are presented. The radar cross section is evaluated by using a plane wave excitation with linear polarization in order to assess the ratio of the backscattered power.
Antenna gain can be measured in a multipath site by moving the antenna under test away from the probe antenna at different distances, and by assessing a normalized transfer function as an average figure over the entire data set. In an earlier work, we provided a statistical explanation to the reduction of the multipath effects. Another possible explanation is based on the synthetic aperture principle, by assimilating the positions of the probe antenna to an antenna array. In this paper, we compare linear scanning to matrix scanning in order to draw optimal choice criteria for the grid of measuring positions. Measurements were performed on a Vivaldi antenna.
In this paper we propose the use of frequency selective surfaces based on meander line radiators, as targets for monitoring slow displacements with synthetic aperture radars. The optimization of the radiators is performed by using genetic algorithms on only two parameters i.e., gain and size. As an example, we have optimized a single meander antenna, resonating in the X-band, at 9.65 GHz.
This paper proposes a novel UWB antenna system for spark detection and localization by using the amplitude comparison direction finding (DF) method. The proposed design consists of two identical axially crossed "padlock” shaped UWB antennas, with unbalanced feeding. Simulation results show that such radiating systems can be used for assessing the direction of arrival for short pulses.
In this paper, we propose an approach of optimization of meander line antennas by using genetic algorithm. Such antennas are used in RFID applications. As opposed to other approaches for meander antennas, we propose the use of only two optimization objectives, i.e. gain and size. As an example, we have optimized a single meander dipole antenna, resonating at 869 MHz.
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