An investigation on the design of a transmission antenna and a rectenna with arrayed apertures for microwave power transmission

✍ Scribed by Yoji Murao; Tadashi Takano

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 311 KB
• Volume: 83
• Category: Article
• ISSN: 8756-6621
• DOI: 10.1002/(sici)1520-6424(200002)83:2<1::aid-ecja1>3.0.co;2-p

✦ Synopsis

Wireless power transmission has been discussed for solar power satellites and ground locations, such as mountain sites and islands, where it is difficult to install power transmission lines. Power transmitting and receiving antennas must be designed so that the power is transmitted from the transmitting antenna to the receiving antenna efficiently and that dc power is obtained efficiently. This article shows that a space-use antenna 100 m in diameter comprising medium-size apertures can achieve a transmission efficiency of approximately 95% if the field on the aperture is Gaussian-tapered among the element apertures. Although grating lobes exist due to the discrete field distribution, they are so small that the power loss caused by the first grating lobes is 0.6%. Then it is shown that power receiving characteristics can be studied with the far field approximation if an ultralarge ground-based rectenna is composed of arrayed elements. In that case the rfdc conversion efficiency becomes high when the element antennas are small at the center and large at the edge, so that the input power to each element antenna is large and at the same level.