The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents printed bow-tie dipole rectenna which works at frequency of 1.8GHz for RF energy harvesting application. The proposed rectenna consists of receiver printed bow-tie dipole antenna and rectifier circuit acts as voltage quadrupler. The bow-tie dipole antenna is chosen due to its simply design, wide bandwidth, and low weight. An FR4 epoxy dielectric substrate with the thickness of...
The method of realization log-periodic vibrator antennas in asymmetrical execution is shown in the work. The method is based on a two-wire collecting line of four conductors with alternating polarity. The proposed construction of a log-periodic antenna made it possible to form a plane of symmetry and a connection of vibrators on each of the conductors of the same polarity. Thus formed the structure...
A simple circularly polarized (CP) antenna array is proposed for millimeter-wave applications. The proposed CP antenna array has a two-layer structure, which is easy for fabrication. A circular loop with a parasitic element is used as the radiation element for wideband operation. It is shown that the proposed 4×4 CP antenna array can achieve a gain of 13–16 dBi from 28.5 to 31.5 GHz.
In this paper, a miniaturized wideband dual-polarized antenna loaded with parasitic loops and straight dipoles has been proposed for 2G/3G/4G base-station applications. Firstly, by loading four parasitic loops to the corners of regular crossed loop dipoles, a miniaturized structure and enhanced impedance bandwidth can be obtained. Then, based on the miniaturized structure, two straight dipoles are...
This paper presents a compensation of variation effect of antennas for stepped-frequency radar identification systems. The antenna effects due to the variation in the antenna response and the mutual coupling degrade the target response in the identification systems. The equation used to reduce the antenna effect is derived. The simulations are demonstrated to validate the benefit of the compensation...
To determine E-field at a tip of probe for evaluating SAR (specific absorption rate) values of DUTs in saline solution, use of near-field transmit antenna factor (NF-TAF) of small dipole antenna is proposed. NF-TAF can be expressed in closed form by assuming hyperbolic sinusoidal current distribution. Also, it can be evaluated by measuring S parameters between two identical dipole antennas and dielectric...
The important factors increased the efficiency of the antenna to support users in the current technology are necessary wide impedance bandwidth, high gain, and low back radiation. In this paper, the antenna composed of the curved strip electric dipole and the vertically-oriented short patch is presented. The measured impedance bandwidth of 60.9% (SWR<2) from the frequency range of 1.62–2.9 GHz...
Scattering performance of a reflectarray using a log-periodic dipole array (LPDA) element is demonstrated numerically and experimentally. The LPDA element and the reflectarray are designed using method of moments (MoM). The designed 10 × 1 reflectarray was fabricated using a 3D printing technology. A bistatic radar cross section (BRCS) of the designed reflectarray was measured in a radio anechoic...
In this paper, a 60 GHz CMOS on-chip dipole antenna with loss-reduced silicon substrate, which had been proposed and simulated by the authors, was measured and gain improvement of approximately 9 dB was obtained. In the antenna, rectangular region with 500 μm × 1000 μm around the dipole is irradiated by proton and conductivity is reduced from 10 S/m (10 Ω cm) to 0.1 S/m (1 kΩ cm). Antenna gain of...
Integrating the concept of Antipodal Vivaldi antenna (AVA) and planar disc-shaped dipole, a half space radiation UWB antenna is proposed in this letter. The antenna adopted approximately 1/4 of the disc-shaped dipole as its radiator, fed by the AVA's exponential slot structure. The proposed antenna has an ultra-wide bandwidth and nearly half space radiation pattern. This character makes it applicable...
A simple tuning technique is proposed to regulate the input impedance of resistive antennas over ultra-wide bandwidth. The proposed tuning technique involves adding extra copper pattern near the antenna drive point. It was shown to affect the input impedances of a resistive dipole and a 12-arm resistive cross dipole over ultra-wide bandwidth. The technique was applied to the 12-arm resistive cross...
In this paper a dipole antenna is loaded with C-shaped metamaterial unit cell array. This array of metamaterial unit cells acts as a dielectric lens to focus the E-filed radiated from the dipole antenna in a particular direction. The effect of loading metamaterial layer on the dipole is studied, a gain enhancement of 5dB is observed. The predicted results were verified through measurements and it...
A dual-polarized cross-dipole antenna with a radiating patch and a tapered balun is proposed for the harvesting of wireless energy over the frequency band from 1.92 GHz to 2.16 GHz. By optimizing the antenna dimensions, the performance of the proposed antenna is improved, such as a 1.01 of VSWR, a 96 % efficiency, and a nearly omnidirectional beam pattern. The proposed antenna could be used to supply...
In this paper, a meander line dipole antenna for Ultra High Frequency Radio Frequency Identification (UHF RFID) tag applications is presented. The proposed antenna consists meandered dipole with end spiral conductor, an inductively coupled parasitic element for size miniaturization and T-loop for feed structure. The antenna is designed for North America UHF RFID frequency band (902–928 MHz) with Alien...
A novel high gain printed dipole-yagi antenna array is proposed in this paper. This antenna has the gain peak of 15.86 dBi and the bandwidth of 1.4 GHz from 4.2 GHz to 5.6 GHz with wide angle coverage in azimuth plane. An antenna prototype has been tested in this paper. The measurements agree with simulations results. This low-profile antenna is easily integrated in front-end for modern wireless communication...
A wireless-power-transmission system, which provides a power source to sensors attached to a human body, has been developed. The human body must be protected from strong fields generated by a radio transmitter. A transmitter with a distance sensor dynamically controls the output power from the antenna so that the field strength at the receiving position is within safe levels. To demonstrate the system,...
A compact UHF cross dipole antenna with reconfigurable radiation pattern is presented. The proposed antenna achieves beam-forming using a modified Yagi antenna concept and the passive parasitic elements. The measured impedance bandwidth of the cross dipole antenna is 884–915 MHz. It is possible to use reflector and director depending on the ON, OFF state of the pin diode. The measured antenna peak...
In this paper, a dual-band dipole with pattern configuration, FPC structure antenna is proposed. By controlling the pin diodes on the reflectors, three modes of radiation pattern are generated for 2G and 5G, respectively, and Reconfiguration antenna can be achieved. DC trace and RF trace are highly integrated and easy to combine with electronic products. Results of measurement for return loss, radiation...
We have studied a high impedance antenna in order to improve the rectifier efficiency for energy harvesting applications. Folded dipole antenna (FDA) with high impedance of over 10 kΩ is proposed. To obtain higher impedance stepup ratio compared with the conventional FDA, an FDA consisting with three strip conductors is investigated. Impedance stepup ratio is calculated and the results in theory,...
We have already proposed a single antenna method for estimating an antenna factor of log-periodic dipole array antenna at 10 m antenna distance up to 1 GHz. In this paper, we apply our proposed single antenna method for double ridged guide horn antenna. For estimating the far field antenna gain, we apply the antenna phase center modified Friis transmission formula. We show the estimation results of...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.