This was the only difference between these two antennas. The proposed rectenna works as a novel rectifying circuit. When the conjugate matching condition is reached, the calculated diode impedance is This architecture reduces the coupling between the antenna and rectifying circuit to some extent.
A more clear aggregating relationship of 50 Ohm interface rectenna system is plotted in Figure 1. A gain of 2. A basic coplanar strip line CPS based rectenna is shown in Figure 2 aand a realistic rectenna is shown in Figure 2 b.
One was embedded with lump elements and the other was not. To stop the antenna from reradiating the harmonic signal generated from the diode a pair of super-strip lines is embedded in the antenna.
In modern wireless communication systems, compact size, low cost, and high integration have always been required. Rectenna Design Methodology To guarantee this novel topology rectenna system, a proposed rectenna in the industrial, scientific, and medical ISM frequency of 2. The filter, matching network, and rectifying circuit usually are realized by the coplanar strip line.
Return losses of antennas with and without lump elements. We divided it into two parts as shown in Figure 3. Without loss of generality, the antennas are based on the proposed topology but not on the frequency optimization.
The radiation pattern of the rectenna simulated by IE3D is shown in Figure 10 bwhich is very similar to that of a normal dipole antenna. Carefully selecting the diode, the proposed rectenna architecture can be very compact in both low and high microwave frequency range.
Rectenna in the wireless energy harvesting faces the same challenges. Considering the above advantages, this novel topology rectenna is very suitable for small wireless harvesting applications. For guaranteeing the performance of the antenna, two antennas were designed and fabricated.
The operation mechanism of the antenna and rectifying circuit in the proposed novel topology is explained and the design methodology is presented in detail. Novel Topology for Compact Rectenna This section will discuss the proposed topology of rectenna and its operating mechanism. For validation, a 2.
Van Beurden, and G. It is worth pointing out that most of the rectenna designs are based on the 50 Ohm interface for reducing the total rectenna system design difficulty. As shown in Figure 3 the main function of the receiving RF energy part including antenna, Design of simple integrated rectenna, and diode is receiving input RF energy and delivering that energy to the diode for rectifying.
In conventional uniplanar rectenna architecture, there is a quarter wavelength coplanar strip line between the diode and RF short chip capacitor to prevent the fundamental and harmonic signals from passing to the load resistor as shown in Figure 6.
In other words, theoretically, if the 50 Ohm interface rule is not used, a rectenna still can be considered a complete unit.
From the published literature, we see that a large amount of research has been done to change the type of antenna or use different filters or diodes in the rectifying part. Comparison of this work with several published work. To reach a small size of the rectenna system, a novel combination method is presented which is shown in Figure 4.
When the input RF energy transfers to the rectenna, the antenna part in the system will work to receive the energy and deliver the RF energy to the diode to be rectified. The total rectenna system including chip capacitor and load resistor is finally optimized by Full-wave EM simulator IE3D based on the method of moments.
Conclusion In this work, a compact rectenna with a novel topology has been developed. The system working mechanism will be explained below. Peak gain and efficiency measurement results of the antenna without and with lump elements.
The rectifying circuit and patch antenna share a common ground and are located on the different layers. For simple measurement consideration, the antenna port impedance is designed as 50 Ohm.
Then the desired impedance of antenna with lump elements is optimized by tuning the value ofand in Figure 9. The RF-to-DC conversion efficiency is defined as Finally, the output voltage is measured and the conversion efficiency is calculated and plotted in Figure After that the conjugate matching impedance for antenna is determined.
When the diode impedance is in the matching range of the antenna, the final optimization will be very fast and effective. Based on the above results in both simulation and measurement, inserting the lump elements into the proposed positions of the antenna does not greatly affect the antenna performances.
The total rectenna system is designed part by part and combined through the 50 Ohm interface. The upper coplanar strip line and load resistor are transparent for the RF signal.Because the team makes the infrared rectenna with the same processes used by the integrated circuit industry, it’s readily scalable, says Joshua Shank, an electrical engineer who tested the.
International Journal of Antennas and Propagation is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles on the design, analysis, and applications of antennas, along with theoretical and practical studies relating the propagation of electromagnetic waves at all relevant frequencies, through.
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