The proposed designs have been simulated, fabricated, and tested. The measurement results show a gain flatness of 1. . Multiharmonic bilateral pull is used to obtain the optimum impedances, to reduce the interaction between source and load side, and the influence of parasitic parameters. The antenna is an off center fed dipole antenna operating at 1. We propose that an antenna of the rectenna with high impedance and high Q is used for increasing the voltage in the diode. The results of rectenna experiment show that the maximum conversion efficiency is 51% at 2.
Over 60% up to 85% energy conversion efficiency is achieved for the input power from 0 to 15 dBm and load impedance between 700 and 4500 Ω. A highly flatness amplifier with the negative feedback structure is designed operating at 1. The proposed rectenna has a compact size of 90 × 90 × 1. A novel concept of designing a broadband high efficiency rectenna without using matching networks is presented in this paper for the first time. Impedance matching networks for nonlinear devices such as amplifiers and rectifiers are normally very challenging to design, particularly in broadband and multiband devices.
The measured results agree well with the simulated value. Simulation and measurements have been carried out for the antenna and the rectifier. Moreover, by using different diodes, the rectenna could still maintain its wide bandwidth and high efficiency over a wide range of input power levels tunable from 0 to 23 dBm and load values from 200 to 2000 Ω. A new broadband dual-stub matching network is proposed to maximize the transmission of wireless power and enhance the reliability of the rectifier when the input power and load varies. Three different broadband antennas have been investigated and compared. The measured results have shown that the rectenna is of high power conversion efficiency over 60% in two wide bands, which are 0.
The antenna impedance can be tuned to the desired value and directly provide a conjugate match to the impedance of a rectifier. A novel broadband dual-polarized cross-dipole antenna is proposed which has embedded harmonic rejection property and can reject the 2nd and 3rd harmonics to further improve the rectenna efficiency. In addition, the rectenna can work well in different operating conditions and using different types of rectifying diodes. Therefore, an improved impedance matching technique is introduced which is aimed to improve the performance of the rectifier with a varying condition. This paper presents a novel design method for a rectenna suitable for a wide range of selectable operating frequency band, input power level and load impedance. The new mechanism for circular polarization is described and an experimental verification is presented.
It is demonstrated that the output power from the proposed rectenna is higher than the other published designs with a similar antenna size under the same ambient condition. The proposed rectenna is general and simple in structure without the need for a matching network hence is of great significance in many applications. The antenna and the rectifier are individually designed, optimized, fabricated and measured. The operation principle of the negative feedback structure under small and large signal input states is presented. Also, the phased array antennas should provide sufficient coverage and occupy less space as space is the premium factor inside a smartphone. In this work, the concept of dual-band resistance compression networks is introduced and applied to the design of rectifier circuits with improved performance. A rectenna has been designed and made based on this concept.
An off-center-fed dipole is introduced to achieve the 90° phase difference required for circular polarization. By designing an impedance matching network with a 60 ° radial stub and a single stub, a rectifier is presented with the maximum efficiency of 55. The measured results show that the proposed rectenna is sensitive and effective in a wide-angle range. For verification, three cases based on the number of Rx coils are considered, and the calculated results are compared with the simulated and measured results for each case. One of the main challenges in implementing sensor devices for internet of things IoTs , is the means for the operating power supply.
Phased array antennas, where the radio signal is focused to a narrow beam, help offset the effect of reduced propagation distance at mm-Wave frequencies. The proposed broadband rectenna could be used to power many low-power electronic devices and sensors and found a range of potential applications. A bandwidth over 20% with a characteristic impedance of 350 Ω was achieved. The fabricated harmonic-tuned oscillator exhibits a maximum efficiency of 83% with an output power of 6. The maximum efficiency of the proposed rectenna reaches 70% at 2.
One of the key motivators for 5G is to provide ubiquitous, high-speed, high-quality wireless broadband coverage to meet societal and industrial needs beyond 2020. Bu çalışmada, ortamda mevcut bulunan radyo frekanslardaki haberleşme sinyallerinden güç elde etmek için bir enerji hasatlama devresi önerilmiştir. Measurements of the fabricated antenna are compared with the results of simulations and the high-impedance wideband design is verified. The results are then used to aid the design of a new rectenna. It is therefore suitable for high efficiency wireless power transfer or energy harvesting applications. Most importantly, it is realized without using complex impedance matching networks which shows significant advantages over existing rectennas in terms of the structure and cost. The measured power sensitivity of this design is down to -35 dBm and the conversion efficiency reaches 55% when the input power to the rectifier is -10 dBm.
This paper presents a novel broadband rectenna for ambient wireless energy harvesting over the frequency band from 1. A rectenna example has been designed, made and tested using this novel method. Rectenna, rectifying antenna, is one of key technologies of a wireless power transfer and an energy harvesting from broadcasting waves. A novel two-branch impedance matching circuit is introduced to enhance the performance and efficiency of the rectenna at a relatively low ambient input power level. High impedance is necessary for producing high efficiency rectennas. It is difficult to effectively rectify or convert low power in the circuit stage of harvesters.
Important design issues are identified with insights drawn. Then they are integrated into one circuit in order to validate the studied rectenna architecture. To extend the narrow beam of the conventional high-gain rectenna, the multiport and multibeam antenna is promising. This project deals with development of unique phased array designs with wide bandwidth, wide coverage and low cost single layer antenna designs. For wireless power transfer, the proposed helical antenna realizes the system design in miniaturization.