A compact hollowed‐out loop rectenna without matching network for wireless sensor applications. Issue 11 (9th September 2020)

• Record Type: Journal Article
• Authors: Jing, Jianwei; Pang, Jiafei; Wang, Shaoyue; Qiu, Zhenyu; Liu, Changjun
• Is Part Of: International journal of RF and microwave computer-aided engineering. Volume 30:Issue 11(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-09
• Subjects: loop antenna -- rectenna -- rectifier -- S‐band -- wireless sensor; Microwave devices -- Computer-aided design -- Periodicals; Computer-aided engineering -- Periodicals; 621.3813
• DOI: 10.1002/mmce.22417
• Languages: English
• ISSNs: 1096-4290

Abstract

Abstract: In this article, a compact and high‐efficiency loop rectenna with matching network elimination for wireless sensor applications at 2.45 GHz is presented. The proposed hollowed‐out square loop antenna is designed and directly provides a conjugate matching to a compact voltage‐doubler rectifier. The loop rectenna can harvest microwave power without increasing the total size or affecting the performance of a wireless sensor. The experiment results show that the peak microwave‐to‐dc conversion efficiency of 74% is obtained at 2.45 GHz when the input power is 18 dBm. The dimension of rectenna is 30 × 30 × 1 mm 3 and only with a weight of 0.58 g, which successfully realizes a high power‐weight‐ratio (PWR). Hence, the proposed rectenna can provide a convenient and practical charging solution for wireless sensors in various applications.