Broadband circularly polarized high-efficiency rectifying antenna with wide power range

Abstract

The invention discloses a broadband circularly polarized high-efficiency rectifying antenna with a wide power range. The antenna comprises a dielectric substrate; a receiving antenna and a rectifyingcircuit which are connected through a microstrip line are printed on two sides of the dielectric substrate; the receiving antenna is a broadband circularly polarized slot antenna; the broadband circularly polarized slot antenna comprises a square ring groove fed by a 90-degree broadband phase shifter based on a coupling line; the rectifying circuit comprises a first rectifying path and a second rectifying path, and the first rectifying path and the second rectifying path are connected in parallel and then are connected with a load in series to be grounded. The antenna provided by the inventioncan be used for a wide-band microwave wireless energy transmission system, and has the advantages of simultaneously compressing the change degree of the impedance of the circuit in a wide-frequency and wide-power range, improving the matching performance and maintaining higher rectification efficiency.

Description

technical field [0001] The invention relates to the technical field of microwave wireless energy transmission, in particular to a wide-band circularly polarized high-efficiency rectifying antenna with a wide power range. Background technique [0002] In the microwave wireless power transfer (WPT) system, the rectifying antenna at the receiving end is mainly composed of the receiving antenna and the rectifying circuit. Among them, the most important index is the RF-DC conversion efficiency, but this index is limited by frequency, input power, matching Various factors such as the network and the structure of the circuit itself. Due to the nonlinear characteristics of the diode itself, the usual matching network design is only for a specific optimal power point. When the operating power point deviates, the rectification efficiency will be greatly reduced. Therefore, in order to widen the input of the rectifier circuit Power range, in the literature "V.Marian, C.Vollaire, J.Ver...

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Problems solved by technology

However, since RCN is heavily dependent on the operating frequency, when the operating frequency deviates from the optimal frequency point, RCN is no longer applicable, and the rectification efficiency will be greatly reduced

[0006] In the literature "Z.X.Du and X.Y.Zhang, "High-efficiency single-and dual-bandrectifiers using a complex impedance compression network for wireless powertransfer," IEEE Trans.Ind.Electron.,vol.65,no.6,pp.5012- 5022, Jun.2018.", a single-frequency and dual-frequency rectification circuit based on complex impedance compression is proposed, but its working bandwidth is very narrow

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