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High gain pentagonal loop rectifying antenna
Author(s) -
Ahn ChiHyung,
Oh Seongwon
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31110
Subject(s) - rectenna , impedance matching , balun , antenna gain , antenna (radio) , electrical engineering , electronic engineering , materials science , electrical impedance , optoelectronics , dipole antenna , engineering , antenna efficiency , rectification , voltage
In this article, a high gain rectifying antenna using a pair of pentagonal loops has been developed for wireless power transfer at 5.8 GHz. For a long range wireless power transfer, the rectenna system requires high gain and high conversion efficiency. The proposed rectenna system consists of a pair of pentagonal loop antennas to achieve high gain characteristics, an impedance transformer, and a rectifying circuit which are designed on a CPS (Coplanar stripline) structure. A metal reflector is also placed for achieving higher gain characteristics in a broadside direction. A CPS to microstrip line balun is designed to verify performance of the pentagonal loop antennas based on CPS structure. The fabricated pentagonal antenna demonstrates high gain of 10.1 dBi, and it results in receiving more RF energy from a designated source. An impedance transformer is designed to change the antenna's input impedance to diode's input impedance and block higher order signals coming back from the rectifying diode. To obtain high conversion efficiency, several load resistors are used. The proposed rectenna system based on CPS pentagonal loops shows measured conversion efficiency of 75% at 5.8 GHz, and its performance has been verified through simulation and measurement.