Prince Kumar Yadav

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Rectennas Design, Development and Applications

The present paper describes the development of rectenna in terms of its applications in Microwave... more The present paper describes the development of rectenna in terms of its applications in Microwave Power Transmission, Harmonic Rejection, CP radiation and ISM band. These rectennas consist of several antennas such as dipole, antenna arrays, slot meander line and rhombic loop antennas along with the rectifying diodes. In some cases more than one rectifying devices have also been used and antenna is found to be act at dual bands. It has also found that rectenna reject the harmonics upto 3 rd order and enhanced the performance characteristics. The maximum efficiency about 91% with 1.2 W of input power has been observed if the rectenna is used for microwave transmission.

$B. Strassner and K. Chong [25] proposed a new CP high gain high efficiency rectenna array designed in a coplanar stripline circuit. And found that each antenna has a CP gain of 11 dB and better than | dB axial ratio fractional BW of 4.7%. The single element antenna uses a CPS band reject filter to suppress the reradiated harmonic by more than 19 dB and achieve 81% RF to dc conversion efficiency at 5.71 GHz. Whereas 3 x 3 rectenna array produces 0.86 W of dc output power with an RF to de conversion efficiency of 78% and an axial ratio of 0.25 dB for an incident CP power density of 7.6 mW/cm’ at 5.61 GHz. The measured RF to de conversion efficiency of single element rectenna and array at 5.71 and 5.61 GHz respectively are shown in Fig. 22 and Fig. 23. Fig. 22 Measured single element rectenna efficiency curves at 5.71 GHz and d = 10 mm for 50 incremental loading. Calculated curves are shown for the 50 and 200 loading.$

$Fig. 32 Directly measured diode conversion efficiency and output voltage versus power delivered to the diode for various load resistances. The rectenna pattern has an elliptical cross section with orthogonal beam width of 40° and 60°. It has coplanar stripline BRF which suppress the reradiated harmonics by 20 dB. The measured diode efficiency and output voltage verses input power for various loads are shown in Fig.32. After one year, they also proposed a RHCP travelling wave low power density rectenna [36]. It uses dual rhombic loop antenna having a CP antenna gain of 14.6 dB with a2: | VSWR BW of 17% and a better than 3 dB axial ratio fraction BW of 7% centered about 5.8 GHz. It has 82% of RF to de conversion efficiency. Fig.33 and Fig. 34 shows the return loss and axial ratio of DRLA + filter + balun circuit, while RF-to-de conversion efficiency for various resistive loading is shown in Fig.35. The capacitor blocks the RF energy by more than 17 dB and the CPS BRF suppress the 2™ harmonics by 14 dB below the peak fundamental gain.$

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