A log‐periodic toothed trapezoidal antenna for RF energy harvesting

Abstract

The measured return loss is compared with the simulated result in Figure 6; good agreement is observed. It is seen that the bandwidths for return loss >6 dB (or VSWR <3) are 687-976 MHz, 1195-1246 MHz, and 1423 MHz, covering all the frequency bands for LTE/GSM/UMTS, GPS, and WLAN/WiMAX applications. The radiation pattern, peak gain, and antenna efficiency were measured using a SATIMO antenna measurement system SG24 at the Speed Communication Technology Corporation Ltd., Huizhou, China. The measured and simulated radiation patterns at 800 MHz, 1220 MHz, 2 GHz, 3.5 GHz, and 5.5 GHz are demonstrated in Figure 7. All radiation patterns show nearly omnidirectional in the x-z plane, suitable for a mobile communications environment. The measured and simulated gains are plotted in Figure 8. The peak gain is about 1-3 dBi for the 700-MHz band, 3-5 dBi for 1220-MHz band and the 2-GHz bands, 3-6 dBi for the 3.5-GHz and the 5-GHz bands. The measured antenna efficiency is also plotted in Figure 8. We can see that the antenna efficiency is higher than 60% for all the frequency bands. CONCLUSIONA multiband uniplanar antenna has been developed for LTE/ GSM/UMTS, GPS, and WLAN/WiMAX applications. The multiband antenna covers three frequency bands: 687-976 MHz, 1195-1246 MHz, and 1423-7665 MHz. The multiband antenna has a thin uniplanar configuration, suitable for the state-of-theart ultra-slim smartphone applications.ABSTRACT: In this work, the performance of a broadband logperiodic toothed trapezoidal antenna is evaluated to know its potential for RF energy harvesting. The energy harvested by the antenna from the different wireless standards in urban areas can be converted into Direct Current and used to feed low power electronics.

A miniaturized ultrawideband Archimedean spiral antenna for low‐power sensor applications in energy harvesting

“…Generally, a RF energy harvesting system has four subsystems: an antenna that acquires the available environmental energy; a rectifier circuit that provides a DC supply; a matching circuit, placed between the antenna and the rectifier circuit, that maximizes the delivered power to the circuit; and a storage circuit that retains the conditioned power. Regarding the harvesting element, it was already discussed in the study that wideband antennas, such as those shown in, are preferable instead of multiband antennas. They are most times easier to design, and they are interoperable among countries, whose frequency assignment plans can be different among them.…”

Ultra-Wideband Trapezoidal Log-Periodic Antenna Integrated with an Elliptical Lens

“…In [19], an ultra-wideband log-periodic toothed antenna was designed with the WLAN notched band feature. In [20], a log-periodic toothed antenna was proposed for harvesting RF energy from 400 MHz to 2.4 GHz. In [21], a trapezoidal toothed LPA with a microstrip line (MSL)-to-coplanar stripline (CPS) balun was proposed for L-band and S-band applications.…”

“…However, the reported antennas typically suffered from bandwidth limitations caused by the feeding methods. A coaxial feeding used in [19,20] compromised the biggest advantage of the trapezoidal LPA. A perpendicular CPS was used to feed a trapezoidal LPA in [21,22].…”

A Wideband Fractal Planar Monopole Antenna with a Thin Slot on Radiating Stub for Radio Frequency Energy Harvesting Applications

“…Nowadays, wideband antennas are used in various wireless applications such as in multimedia devices, smart phones etc. Apart from these applications, wideband antennas can be also used as an important component for radio frequency (RF) energy harvesting systems [1]. The RF energy harvesting can be applied as a power supply for a number of the low power electronic devices such as wireless sensor nodes, in order to either replace or even to recharge the the devices' battery.…”

“…In the last decade, ranges of antenna for energy harvesting applications have been proposed such as patch antenna [3], spiral antenna [4], dipole antenna [5], slot antenna [6], metamaterial antenna [7], and so on. These antenna designs have narrowband [5,8], multiband [9,10], or wideband [1][2][3][4][11][12][13][14] operations. A single narrow band design produces low conversion efficiency for low-power levels of input power density and not very proper for wireless energy scavenging applications.…”